World Journal of Engineering最新文献

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Optimizing thermal insulation in subtropical monsoon climate religious buildings: material selection and thickness assessment 优化亚热带季风气候宗教建筑的隔热性能:材料选择和厚度评估
World Journal of Engineering Pub Date : 2024-04-02 DOI: 10.1108/wje-07-2023-0241
Jhumana Akter, Mobasshira Islam, Shuvo Dip Datta
{"title":"Optimizing thermal insulation in subtropical monsoon climate religious buildings: material selection and thickness assessment","authors":"Jhumana Akter, Mobasshira Islam, Shuvo Dip Datta","doi":"10.1108/wje-07-2023-0241","DOIUrl":"https://doi.org/10.1108/wje-07-2023-0241","url":null,"abstract":"Purpose\u0000Determining the suitable material and accurate thickness of the thermal insulation layer used in exterior walls during the design phase of a building can be challenging. This study aims to determine suitable material and optimum thickness for the insulation layer considering both operational and embodied factors by a comprehensive assessment of the energy, economic and environmental (3E) parameters.\u0000\u0000Design/methodology/approach\u0000First, the energy model of an existing building was created by using Autodesk Revit software according to the as-built floor layout to evaluate the impact of five alternative insulating materials in varying thickness values. Second, using the results derived from the model, a thorough evaluation was conducted to ascertain the optimal insulation material and thickness through individual analysis of 3E factors, followed by a comprehensive analysis considering the three aforementioned factors simultaneously.\u0000\u0000Findings\u0000The findings indicated that polyurethane with 13 cm thickness, rockwool with 10 cm thickness and EPS with 20 cm thickness were the best states based on energy consumption, cost and environmental footprint, respectively. After completing the 3E investigation, the 15-cm-thick mineral wool insulation was presented as the ideal state.\u0000\u0000Practical implications\u0000This study explores how suitable material and thickness of insulating material can be determined in advance during the design phase of a building, which is a lot more accurate and cost-effective than applying insulating materials by assumed thickness in the construction phase.\u0000\u0000Originality/value\u0000To the best of the authors’ knowledge, this paper is unique in investigating the advantages of using thermally insulating materials in the context of a mosque structure, taking into account its distinctive attributes that deviate from those of typical buildings. Furthermore, there has been no prior analysis of the cost and sustainability implications of these materials concerning the characteristics of subtropical monsoon climate.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"34 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140352637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization and modelling of WCEDM process parameters for GZR-AA7475 HMMC using GRA and Taguchi approach 使用 GRA 和田口方法对 GZR-AA7475 HMMC 的 WCEDM 工艺参数进行优化和建模
World Journal of Engineering Pub Date : 2024-02-26 DOI: 10.1108/wje-09-2023-0354
Madhavarao Singuru, Kesavarao V.V.S., Rama Bhadri Raju Chekuri
{"title":"Optimization and modelling of WCEDM process parameters for GZR-AA7475 HMMC using GRA and Taguchi approach","authors":"Madhavarao Singuru, Kesavarao V.V.S., Rama Bhadri Raju Chekuri","doi":"10.1108/wje-09-2023-0354","DOIUrl":"https://doi.org/10.1108/wje-09-2023-0354","url":null,"abstract":"\u0000Purpose\u0000This study aims to investigate the optimal process parameters of the wire-cut electrical discharge machining (WCEDM) for the machining of the GZR-AA7475 hybrid metal matrix composite (HMMC). HMMCs are prepared with 2 Wt.% graphite and 4 Wt.% zirconium dioxide reinforced with aluminium alloy 7475 (GZR-AA7475) composite by using the stir casting method. The objective is to enhance the mechanical properties of the material while preserving its unique features. WCEDM with a 0.18 mm molybdenum wire electrode is used for machining the composite.\u0000\u0000\u0000Design/methodology/approach\u0000To conduct experimental studies, a Taguchi L27 orthogonal array was adopted. Input variables such as peak current (Ip), pulse-on-time (TON) and flushing pressure (PF) were used. The effect of process parameters on the output responses, such as material removal rate (MRR), surface roughness rate (SRR) and wire wear ratio (WWR), were investigated. The grey relational analysis (GRA) is used to obtain the optimal combination of the process parameters. Analysis of variance (ANOVA) was also used to identify the significant process parameters affecting the output responses.\u0000\u0000\u0000Findings\u0000Results from the current study concluded that the optimal condition for grey relational grade is obtained at TON = 105 µs, Ip = 100 A and PF = 90 kg/cm2. Peak current is the most prominent parameter influencing the MRR, whereas SRR and WRR are highly influenced by flushing pressure.\u0000\u0000\u0000Originality/value\u0000Identifying the optimal process parameters in WCEDM for machining of GZR-AA7475 HMMC. ANOVA and GRA are used to obtain the optimal combination of the process parameters.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"9 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140430444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating the impact of TiO2 filler on abrasive wear characteristics of bamboo fiber-reinforced epoxy composites using the Taguchi method 用田口方法研究 TiO2 填料对竹纤维增强环氧树脂复合材料磨料磨损特性的影响
World Journal of Engineering Pub Date : 2024-01-30 DOI: 10.1108/wje-10-2023-0432
Ravikantha Prabhu, Sharun Mendonca, Pavana Kumara Bellairu, Rudolf C Dsouza, Thirumaleshwara S. G. Bhat
{"title":"Investigating the impact of TiO2 filler on abrasive wear characteristics of bamboo fiber-reinforced epoxy composites using the Taguchi method","authors":"Ravikantha Prabhu, Sharun Mendonca, Pavana Kumara Bellairu, Rudolf C Dsouza, Thirumaleshwara S. G. Bhat","doi":"10.1108/wje-10-2023-0432","DOIUrl":"https://doi.org/10.1108/wje-10-2023-0432","url":null,"abstract":"\u0000Purpose\u0000The purpose of this study is to investigate the impact of titanium oxide (TiO2) filler on the abrasive wear properties of bamboo fiber reinforced epoxy composites (BFRCs) using a Taguchi approach. The study aims to enhance the abrasive wear resistance of these composites by introducing TiO2 filler as a potential reinforcement, thus contributing to the development of sustainable and environmentally friendly materials.\u0000\u0000\u0000Design/methodology/approach\u0000This study focuses on the fabrication of epoxy/bamboo composites infused with TiO2 particles within the Wt.% range of 0–8 Wt.% using hand layup techniques. The resulting composites were subjected to wear testing according to ASTM G99-05 standards. Statistical analysis of the wear results was carried out using the Taguchi design of experiments (DOE). Additionally, an analysis of variance (ANOVA) was used to determine the influential control factors impacting the specific wear rate (SWR) and coefficient of friction (COF).\u0000\u0000\u0000Findings\u0000The study illuminates how integrating TiO2 filler enhances abrasive wear in epoxy/bamboo composites. Statistical analysis of SWR highlights abrasive grit size (grit) as the most influential factor, followed by normal load, Wt.% of TiO2 and sliding distance. Analysis of the COF identifies normal load as the primary influential factor, followed by grit, Wt.% of TiO2 and sliding distance. The Taguchi predictive model closely aligns with experimental results, validating its reliability. The morphological study revealed significant differences between the unfilled and TiO2-filled composites. The inclusion of TiO2 improved wear resistance, as evidenced by reduced surface damage and wear debris.\u0000\u0000\u0000Originality/value\u0000This research paper aims to integrate TiO2 filler and bamboo fibers to create an innovative hybrid composite material. TiO2 micro and nanoparticles show promise as filler materials, contributing to improved tribological properties of epoxy composites. The utilization of Taguchi’s DOE and ANOVA for statistical analysis provides valuable guidance for academic researchers and practitioners in optimizing control variables, especially in the context of natural fiber reinforced composites.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"6 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139591819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a long-term solar PV power forecasting model for power system planning 为电力系统规划开发长期太阳能光伏发电预测模型
World Journal of Engineering Pub Date : 2024-01-25 DOI: 10.1108/wje-09-2023-0407
Jain Vinith P.R., Navin Sam K., V. T., Joseph Godfrey A., Venkadesan Arunachalam
{"title":"Development of a long-term solar PV power forecasting model for power system planning","authors":"Jain Vinith P.R., Navin Sam K., V. T., Joseph Godfrey A., Venkadesan Arunachalam","doi":"10.1108/wje-09-2023-0407","DOIUrl":"https://doi.org/10.1108/wje-09-2023-0407","url":null,"abstract":"\u0000Purpose\u0000This paper aims to Solar photovoltaic (PV) power can significantly impact the power system because of its intermittent nature. Hence, an accurate solar PV power forecasting model is required for appropriate power system planning.\u0000\u0000\u0000Design/methodology/approach\u0000In this paper, a long short-term memory (LSTM)-based double deep Q-learning (DDQL) neural network (NN) is proposed for forecasting solar PV power indirectly over the long-term horizon. The past solar irradiance, temperature and wind speed are used for forecasting the solar PV power for a place using the proposed forecasting model.\u0000\u0000\u0000Findings\u0000The LSTM-based DDQL NN reduces over- and underestimation and avoids gradient vanishing. Thus, the proposed model improves the forecasting accuracy of solar PV power using deep learning techniques (DLTs). In addition, the proposed model requires less training time and forecasts solar PV power with improved stability.\u0000\u0000\u0000Originality/value\u0000The proposed model is trained and validated for several places with different climatic patterns and seasons. The proposed model is also tested for a place with a temperate climatic pattern by constructing an experimental solar PV system. The training, validation and testing results have confirmed the practicality of the proposed solar PV power forecasting model using LSTM-based DDQL NN.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"15 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139597746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental study on the behavior of pre-loaded reinforced concrete (RC) deep beams with openings strengthened with FRP sheets 用 FRP 片材加固带开口的预加载钢筋混凝土 (RC) 深梁行为的实验研究
World Journal of Engineering Pub Date : 2024-01-16 DOI: 10.1108/wje-08-2023-0307
B. Osman
{"title":"Experimental study on the behavior of pre-loaded reinforced concrete (RC) deep beams with openings strengthened with FRP sheets","authors":"B. Osman","doi":"10.1108/wje-08-2023-0307","DOIUrl":"https://doi.org/10.1108/wje-08-2023-0307","url":null,"abstract":"\u0000Purpose\u0000Recently, the repairing of reinforced concrete (RC) structures attracted great research attentions, but the research interests were mainly concentrated on common repairing types. To this end, in this paper, a repairing of pre-loaded RC beams strengthened by aramid reinforcement polymers (AFRP) is presented. Furthermore, the purpose of this paper is to study the behavior of pre-loaded RC Deep beams under sustained load. The AFRP has many advantages such as controlling stresses distribution around the openings, controlling failure modes, and enhancing the structural capacity of pre-cracked RC beams.\u0000\u0000\u0000Design/methodology/approach\u0000Four specimens were experimentally tested: one specimen without strengthening, which is considered as control specimen, one strengthened specimen using AFRP without pre-cracking and two specimens subjected to pre-cracking load before prior to AFRP application. Furthermore, after validation of experimental data by using ANSYS software, a parametric study was conducted to investigate the effect of pre-damage level on shear capacity of RC beams. For pre-cracked beams, loading was first applied until the cracking stage, followed by specimen repairing with epoxy injection, and then the specimens were loaded again until failure point.\u0000\u0000\u0000Findings\u0000The result showed that pre-damage level and AFRP strengthening have great influence on the ultimate strength and failure mode. In addition, the results obtained from experimental tests were compared with those from numerical validation with ANSYS and showed good agreement.\u0000\u0000\u0000Originality/value\u0000Based on ACI guidelines, an analytical equation for calculating the shear strength of strengthened RC beams with openings subjected to pre-damage was then proposed, and the calculated results were compared with those from the tests, with differences not exceeding 10%.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"30 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139528677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Behavior of elastohydrodynamic lubricating film point contact problems in the unsteady state of reciprocating motion 往复运动非稳定状态下弹性流体动力润滑膜点接触问题的行为
World Journal of Engineering Pub Date : 2024-01-16 DOI: 10.1108/wje-09-2023-0321
Mohamed F. Abd Alsamieh
{"title":"Behavior of elastohydrodynamic lubricating film point contact problems in the unsteady state of reciprocating motion","authors":"Mohamed F. Abd Alsamieh","doi":"10.1108/wje-09-2023-0321","DOIUrl":"https://doi.org/10.1108/wje-09-2023-0321","url":null,"abstract":"\u0000Purpose\u0000In this study a numerical analysis of the elastohydrodynamic lubrication point contact problem in the unsteady state of reciprocating motion is presented. The effects of frequency, stroke length and load on film thickness and pressure variation during one operating cycle are discussed. The general tribological behavior of elastohydrodynamic lubrication during reciprocating motion is explained.\u0000\u0000\u0000Design/methodology/approach\u0000The system of equations of Reynolds, film thickness considering surface deformation and load balance equations are solved using the Newton-Raphson technique with the Gauss-Seidel iteration method. Numerical solutions were performed with a sinusoidal contact surface velocity to simulate reciprocating elastohydrodynamics. The methodology is validated using historical experimental measurements/observations and numerical predictions from other researchers.\u0000\u0000\u0000Findings\u0000The numerical results showed that the change in oil film during a stroke is controlled by both wedge and squeeze effects. When the surface velocity is zero at the stroke end, the squeeze effect is most noticeable. As the frequency increases, the general trend of central and minimum film thickness increases. With the same entraining speed but different stroke lengths, the properties of the oil film differ from one another, with an increase in stroke length leading to a reduction in film thickness. Finally, the numerical results showed that the overall film thickness decreases with increasing load.\u0000\u0000\u0000Originality/value\u0000General tribological behaviors of elastohydrodynamic lubricating point contact, represented by pressure and film thickness variations over time and profiles, are analyzed under reciprocating motion during one working cycle to show the effects of frequency, stroke length and applied load.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":" 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139620489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Entropy generation of thermophysical properties on heat and mass transfer pulsatile flow of non-Newtonian nanofluid 非牛顿纳米流体传热和传质脉动流的热物理性质熵生成
World Journal of Engineering Pub Date : 2024-01-15 DOI: 10.1108/wje-04-2023-0110
F. D. Ayegbusi, A. Idowu
{"title":"Entropy generation of thermophysical properties on heat and mass transfer pulsatile flow of non-Newtonian nanofluid","authors":"F. D. Ayegbusi, A. Idowu","doi":"10.1108/wje-04-2023-0110","DOIUrl":"https://doi.org/10.1108/wje-04-2023-0110","url":null,"abstract":"\u0000Purpose\u0000The purpose of this study is to investigate the effects of entropy generation of some embedded thermophysical properties on heat and mass transfer of pulsatile flow of non-Newtonian nanofluid flows between two porous parallel plates in the presence of Lorentz force are taken into account in this research.\u0000\u0000\u0000Design/methodology/approach\u0000The governing partial differential equations (PDEs) were nondimensionalized using suitable nondimensional quantities to transform the PDEs into a system of coupled nonlinear PDEs. The resulting equations are solved using the spectral relaxation method due to the effectiveness and accuracy of the method. The obtained velocity and temperature profiles are used to compute the entropy generation rate and Bejan number. The influence of various flow parameters on the velocity, temperature, entropy generation rate and Bejan number are discussed graphically.\u0000\u0000\u0000Findings\u0000The results indicate that the energy losses can be minimized in the system by choosing appropriate values for pertinent parameters; when thermal conductivity is increasing, this leads to the depreciation of entropy generation, and while this increment in thermal conductivity appreciates the Bejan number, the Eckert number on entropy generation and Bejan number, the graph shows that each time of increase in Eckert will lead to rising of entropy generation while this increase shows a reduction in Bejan number. To shed more light, these results were further demonstrated graphically. The current research was very well supported by prior literature works.\u0000\u0000\u0000Originality/value\u0000All results are presented graphically, and the results in this article are anticipated to be helpful in the area of engineering.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"27 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139528786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrical analysis of normal and aged high voltage transformer oil considering different size effects of Al2O3 考虑到 Al2O3 不同粒度效应的正常和老化高压变压器油电气分析
World Journal of Engineering Pub Date : 2024-01-12 DOI: 10.1108/wje-10-2023-0446
M. Khodsuz, A. H. Mashhadzadeh, Aydin Samani
{"title":"Electrical analysis of normal and aged high voltage transformer oil considering different size effects of Al2O3","authors":"M. Khodsuz, A. H. Mashhadzadeh, Aydin Samani","doi":"10.1108/wje-10-2023-0446","DOIUrl":"https://doi.org/10.1108/wje-10-2023-0446","url":null,"abstract":"\u0000Purpose\u0000Electrical characteristics of transformer oil (TO) have been studied during normal and thermal aging conditions. In this paper, breakdown voltage (BDV), partial discharge (PD), heat transfer results and the physical mechanisms considering the impact of varying the diameter of Al2O3 nanoparticles (NPs) have been investigated. Different quantities of the two sizes of Al2O3 were added to the oil using a two-step method to determine the positive effect of NPs on the electrical and thermal properties of TO. Finally, the physical mechanisms related to the obtained experimental results have been performed.\u0000\u0000\u0000Design/methodology/approach\u0000The implementation of nanoparticles in this paper was provided by US Research Nanomaterials, Inc., USA. The provided Al2O3 NPs have an average particle size of 20–80 nm and a specific surface area of 138 and 58 m2/g, respectively, which have a purity of over 99%. Thermal aging has been done. The IEC 60156 standard has been implemented to calculate the BDV, and a 500-mL volume test cell (Apar TO 1020) has been used. PD test is performed according to Standard IEC 60343, and a JDEVS-PDMA 300 device was used for this test.\u0000\u0000\u0000Findings\u0000BDV tests indicate that 20 nm Al2O3 is more effective at improving BDV than 80 nm Al2O3, with an improvement of 113% compared to 99% for the latter. The analysis of Weibull probability at BDV indicates that 20 nm Al2O3 performs better, with improvements of 141%, 125% and 112% at probabilities of 1, 10 and 50%, respectively. The results of the PD tests using the PDPR pattern also show that 20 nm Al2O3 is superior. For the heat transfer test, 0.05 g/L of both diameters were used to ensure fair conditions, and again, the advantage was with 20 nm Al2O3 (23% vs 18%).\u0000\u0000\u0000Originality/value\u0000The effect of Al2O3 NP diameter (20 and 80 nm) on various properties of virgin and aged TO has been investigated experimentally in this paper to examine the effect of proposed NP on electrical improvement of TO.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"10 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139437952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of the effects from geopathic stress on the design thickness of flexible pavements 调查地应力对柔性路面设计厚度的影响
World Journal of Engineering Pub Date : 2024-01-12 DOI: 10.1108/wje-09-2023-0383
Rohit R. Salgude, Prasad Pailwan, Sunil Pimplikar, Dipak M. Kolekar
{"title":"Investigation of the effects from geopathic stress on the design thickness of flexible pavements","authors":"Rohit R. Salgude, Prasad Pailwan, Sunil Pimplikar, Dipak M. Kolekar","doi":"10.1108/wje-09-2023-0383","DOIUrl":"https://doi.org/10.1108/wje-09-2023-0383","url":null,"abstract":"\u0000Purpose\u0000Soil is an essential component of road construction and is used in the form of subgrade materials. It ensures the stability and durability of the road under adverse conditions; being one of the important parameters, poor judgment of the engineering properties of soil can lead to pavement failure. Geopathic stress (GS) is a subtle energy in the form of harmful electromagnetic radiation. This study aims to investigate the effect of GS on soil and concrete.\u0000\u0000\u0000Design/methodology/approach\u0000A total of 23 soil samples from stress zones and nonstress zones were tested for different engineering properties like water content, liquid limit, plastic limit, specific gravity and California bearing ratio. Two concrete panels were placed on GS zones, and their quality was monitored through nondestructive testing for a period of one year.\u0000\u0000\u0000Findings\u0000The result shows that the engineering properties of soil and pavement thickness are increasing in stress zones as compared with nonstress zones. For concrete panels, as time passes, the quality of the concrete gets reduced, which hints toward the detrimental effect of GS.\u0000\u0000\u0000Originality/value\u0000This research is a systematic, scientific, reliable study which evaluated subgrade characteristics thus determining the detrimental impact of the GS on soil and pavement thickness. On a concluding note, this study provides a detailed insight into the performance of the road segment when subjected to GS. Through this investigation, it is recommended that GS should be considered in the design of roads.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"12 40","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139437670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Low speed impact on sandwich beam with flexible core and face sheets reinforced with FG-CNTs 夹层梁受到的低速冲击,夹层梁的柔性芯材和面材使用 FG-CNT 加固
World Journal of Engineering Pub Date : 2024-01-12 DOI: 10.1108/wje-07-2023-0236
Manar Hamid Jasim, A. M. Al-araji
{"title":"Low speed impact on sandwich beam with flexible core and face sheets reinforced with FG-CNTs","authors":"Manar Hamid Jasim, A. M. Al-araji","doi":"10.1108/wje-07-2023-0236","DOIUrl":"https://doi.org/10.1108/wje-07-2023-0236","url":null,"abstract":"\u0000Purpose\u0000The purpose of this study is to model the theory of the low-velocity impact (LVI) process on sandwich beams consisting of flexible cores and face sheets reinforced with functionally graded carbon nanotubes (CNTs).\u0000\u0000\u0000Design/methodology/approach\u0000A series of parameters derived from molecular dynamics are used to consider the size scale in the mixture rule for the combination of CNTs and resin. A procedure involving the use of the first-order shear deformation theory of the beam is used to provide the displacement field of the sandwich beam. The energy method and subsequently the generalized Lagrange method are used to derive the motion equations. Due to the use of Hertz’s nonlinear theory to calculate the contact force, the equations of motion are nonlinear. Validation of the problem is carried out by comparing natural frequencies with other papers.\u0000\u0000\u0000Findings\u0000The influence of a series of parameters such as CNTs distributions pattern in the face sheets, the influence of the CNTs volume fraction and the influence of the core thickness to the face sheets thickness ratio in the issue of LVI on sandwich beams with clamped-clamped boundary conditions is investigated. The result shows that the type of CNTs pattern in the face sheet and the CNTs volume fraction have a very important effect on the answer to the problem, which is caused by the change in the value of the Young’s modulus of the beam at the contact surface. Changes in the core thickness to the face sheets thickness ratio has little effect on the impact response.\u0000\u0000\u0000Originality/value\u0000Considering the important application of sandwich structures in vehicles, aviation and ships, in this research, sandwich beams consisting of flexible core and CNTs-reinforced face sheets are investigated under LVI.\u0000","PeriodicalId":509668,"journal":{"name":"World Journal of Engineering","volume":"2 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139437839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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