Journal of the Mechanical Behavior of Materials最新文献_第7页

Experimental investigation on the influence of partially stabilised nano-ZrO2 on the properties of prepared clay-based refractory mortar 部分稳定化纳米ZrO2对粘土基耐火砂浆性能影响的实验研究

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-12-15 DOI: 10.1515/jmbm-2022-0265

S. Jawad, Mustafa H. Omar

引用次数: 1

The mechanical properties of lightweight (volcanic pumice) concrete containing fibers with exposure to high temperatures 含纤维的轻质（火山浮石）混凝土在高温下的力学性能

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-12-13 DOI: 10.1515/jmbm-2022-0249

Muthanna A. Abbu, A. Al-attar, Saad Abd Alrahman, Majid Al‐Gburi

{"title":"The mechanical properties of lightweight (volcanic pumice) concrete containing fibers with exposure to high temperatures","authors":"Muthanna A. Abbu, A. Al-attar, Saad Abd Alrahman, Majid Al‐Gburi","doi":"10.1515/jmbm-2022-0249","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0249","url":null,"abstract":"Abstract Fire is considered one of the main risks leading to building collapse. Lightweight concrete comprises a variety of components, each of which has a distinct behavior under the effect of temperature change. A total of 16 concrete mixtures were investigated in this article. A reference mix of concrete comprising simply ordinary Portland cement and ten mixes having varying percentages of fine and coarse lightweight aggregates (pumice), which were replaced gravel and sand by fine pumice and coarse aggregates pumice by 20, 40, 60, 80, and 100%, respectively. In addition, the study focused on the effects of adding fibers to lightweight aggregate concrete mixtures. Polypropylene fibers, carbon fibers, and steel fibers were employed as fiber additions. The binary mixture had higher density than the remaining mixtures containing one substitute. The behavior of six concrete mixes in addition to the reference mix of ordinary concrete after exposure to temperatures 100, 250, 350 and 450°C for 2 h and then cooled in two ways (water and air) as well as examined directly and the results showed that the concrete mixes containing fiber had better behavior compared to other mixtures, especially at high temperature. If left to cool in the air, the lightweight concrete containing volcanic pumice can recover its compression strength after being exposed to high temperatures.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49643643","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: 4

Singularities at interface corners of piezoelectric-brass unimorphs 压电黄铜单晶界面角的奇异性

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0254

Chonlada Luangarpa, C. Kanchanomai, H. Koguchi

{"title":"Singularities at interface corners of piezoelectric-brass unimorphs","authors":"Chonlada Luangarpa, C. Kanchanomai, H. Koguchi","doi":"10.1515/jmbm-2022-0254","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0254","url":null,"abstract":"Abstract In this study, singularity fields at the interface corners of piezoelectric-brass unimorphs are investigated. Two models differing in side surface geometry (step and flat surfaces) are analyzed to study the singularity effect on mechanical (stress–strain) and electrical (electric potential and intensity) behavior. A mixed-mode mechanical boundary condition is applied for analyzing the realistic application of unimorphs, with normal force, shear force, and bending moment as internal forces. The conservative integral together with a three-dimensional finite element analysis is used to determine the intensity of singularity. There are three singularity terms at each vertex and singular line. All singularity terms are investigated in detail. Intensities of the singularities at the vertex and several points located on side surfaces (singular lines) are examined. Results show that the intensities of singularities for mixed-mode conditions differ from that of tensile load conditions. For mixed-mode conditions, the intensity of singularity must be calculated for all singularity terms. In addition, the stress singularity characteristics at the vertex may be described as a function of the singularities along the singular lines. These findings clarify the understanding of singularity at interface corners of piezoelectric-brass unimorphs and may be used as references for developing relevant piezoelectric devices.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"755 - 766"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45180720","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

Evaluation of the wettability of prepared anti-wetting nanocoating on different construction surfaces 制备的抗润湿纳米涂层在不同建筑表面的润湿性评价

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0260

Mustafa H. Omar, Wissam A. Hussian, M. A. Ahmed

{"title":"Evaluation of the wettability of prepared anti-wetting nanocoating on different construction surfaces","authors":"Mustafa H. Omar, Wissam A. Hussian, M. A. Ahmed","doi":"10.1515/jmbm-2022-0260","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0260","url":null,"abstract":"Abstract Generally, the major problems of moisture damage are caused by wetting, and particularly in construction, which has led to extensive research for the production of hydrophobic (anti-wetting) coatings. The aim of this research is to prepare an anti-wetting (hydrophobic) nanocomposite coating for different construction surfaces (ceramic, brick and gypsum). Hydrophobic nanocomposite coating was synthesized using electrospinning technique. Polymethyl methacrylate and polystyrene (PS) solutions were prepared in different ratios and then separately reinforced with ZrO2 and ZnO nanoparticles. Contact angle, surface roughness, surface free energy and weathering effects were calculated for all specimens after being coated. All previously selected materials surfaces showed superhydrophobic and hydrophobic properties. The best results were obtained on ceramic surfaces after coating with PS/ZrO2. The water contact angle was 153° while the surface roughness was 0.491 µm and also showed the lowest surface free energy which was 5.5 mJ/m2. Weathering conditions tend to decrease the values of contact angle and this is due to the environmental effect of the weathering but they still have their hydrophobic properties. SEM test was used to determine the surface morphology and nanoparticle size for ceramic surfaces coated with PS and nano-ZrO2.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"786 - 792"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43309635","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: 1

The temporal rhythm of scenes and the safety in educational space 场景的时间节奏与教育空间的安全

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0074

S. Shakir, Ameera Jaleel

{"title":"The temporal rhythm of scenes and the safety in educational space","authors":"S. Shakir, Ameera Jaleel","doi":"10.1515/jmbm-2022-0074","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0074","url":null,"abstract":"Abstract The visual scene represents the scope of vision or what the eyes see (image or an appearance) and is perceived by the senses, as well as it is the place of the event and natural and physical design elements. So, the relationship between the design scenes and the user is important because it has psychological and physiological effects to achieve human needs such as the safety, which is one of the human needs. Scenes’ design plays a role in stimulating a sense (safety or fear) and is reflected during the person’s performance of various activities in the space. Recently, a phenomenon of insafety and fear has spread in children’s schools, and many studies have recorded that this phenomenon is common in 2–5% of children and adolescents, and 4–5% of children in the primary stage suffer from anxiety disorders that prevent them from practicing their studies normally. Through a pilot study of the Iraq schools, it was found that 55% of them suffer from insafety and fear. This research is an attempt to study the relationship between the scene temporal rhythm to stimulate children’s (safety and fear) feelings. To achieve the aim of this research, a descriptive and analytical methodology was adopted with two theoretical and practical axes. Finally, the results and conclusion show that there is a relationship between the temporal rhythm characteristics and the type of scene that affects the behavior patterns and diversity activities (it means that it stimulates a sense of safety for children in the educational space).","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"719 - 728"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49368405","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

Improving the flexural behavior of RC beams strengthening by near-surface mounting 近表面安装法改善钢筋混凝土梁的受弯性能

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0070

Hadeel S. AL-Ameedee, Hayder M. Al-Khafaji

{"title":"Improving the flexural behavior of RC beams strengthening by near-surface mounting","authors":"Hadeel S. AL-Ameedee, Hayder M. Al-Khafaji","doi":"10.1515/jmbm-2022-0070","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0070","url":null,"abstract":"Abstract This article presents the experimental investigations undertaken to evaluate the strengthening and enhancement characteristics of near-surface mounted (NSM) devices using different types of bars. A total of 4 concrete beams (150 mm × 300 mm × 1,500 mm) were reinforced in flexure. Three beams strengthened with different embedments of NSM (carbon fiber-reinforced polymer [CFRP], Glass fiber-reinforced polymer [GFRP], and steel) bars, and one unstrengthened beam used as a control beam were tested under monotonic static loading to determine the enhancing influence of the fiber-reinforced polymer (FRP) reinforcement. The performance of different bars used to establish the concrete is examined. A general methodology to evaluate the improving flexural behavior of RC beams strengthened with NSM–FRP bars is presented. A quantitative criterion governing debonding failure is established. The proposed bond model assumes linear elastic behavior for the concrete, adhesive, and NSM–FRP bars, following the same philosophy as the American concrete institute [ACI] provisions for bond analysis and design to control the cracks. So FRP reinforcements show substantial deformation before failure when the cross-sectional area is based on a permissible strain during service, so there is no need to check the deformability. The results of the tests show that using NSM–CFRP bars improves the flexural capacity and stiffness of the strengthened concrete beams of other types.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"701 - 709"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41647419","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: 1

Performance of reinforced concrete non-prismatic beams having multiple openings configurations 具有多个开口配置的钢筋混凝土非棱柱梁的性能

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0043

Tareq R. Meyoof, A. F. Izzet, Majid M. Kharnoob

引用次数: 1

Prospect of using geotextile reinforcement within flexible pavement layers to reduce the effects of rutting in the middle and southern parts of Iraq 在伊拉克中南部柔性路面层内使用土工布加固以减少车辙影响的前景

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0040

Abdul Hadi Meteab AL Sa’adi, F. F. Al-khafaji, T. M. Hashim, Munther L. Abdul Hussein, Y. A. Ali, Alaa H. Ali, Y. M. Jebur, Lina H. Ali, M. Z. Al-mulali, Ashraf Anwer Al-Khazraji

{"title":"Prospect of using geotextile reinforcement within flexible pavement layers to reduce the effects of rutting in the middle and southern parts of Iraq","authors":"Abdul Hadi Meteab AL Sa’adi, F. F. Al-khafaji, T. M. Hashim, Munther L. Abdul Hussein, Y. A. Ali, Alaa H. Ali, Y. M. Jebur, Lina H. Ali, M. Z. Al-mulali, Ashraf Anwer Al-Khazraji","doi":"10.1515/jmbm-2022-0040","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0040","url":null,"abstract":"Abstract Geotextile reinforcement techniques have been widely used in paving works around the world and have proven to be effective in improving pavement performance. This study has focused on using different positions and numbers of geotextile reinforcement sheets between the layers of flexible pavement for rutting reduction. Fitting depth was measured in the field at seven constructed sections of the pavement of the road model. Each section has been strengthened with different reinforcement approaches. All road sections were subjected to a maximum load repetition of 10,000 cycles. The results indicate that using three layers of geotextile beneath each course of the designed road pavement sections (surface, binder, and base) reduced rutting by 96%. Traffic benefit ratio (TBR) has been employed in this study to reveal the behavior of geotextile reinforcement in increasing the service life of the road. TBR values are the load cycling ratio between the reinforced and unreinforced section for the exact recorded rut depth, it has been found to be minimally equal to 4 for the case of using one layer of reinforcement at interface I, and that value keeps growing up for other reinforcement cases.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"323 - 336"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41664075","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: 1

Finite element analysis of the soil and foundations of the Al-Kufa Mosque 库法清真寺地基和地基的有限元分析

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0037

Hasan Mahdi Al-Jiboury, M. K. Fakhraldin

{"title":"Finite element analysis of the soil and foundations of the Al-Kufa Mosque","authors":"Hasan Mahdi Al-Jiboury, M. K. Fakhraldin","doi":"10.1515/jmbm-2022-0037","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0037","url":null,"abstract":"Abstract The Great Mosque of Kufa, built in 639 CE and located in Al-Kufa, Iraq, is considered one of the most important mosques in the Islamic world. Because cracks appeared in the historical walls of the Al-Kufa Mosque during the construction of the Muslim Bin Aqeel Underpass, the values and locations of bending moment and shear force may be useful for wall maintenance. So, this study aims to determine the maximum and minimum values and locations of settlement, bending moment, and shear forces under the mosque walls’ foundations. Historical references are used to know the previous architectures of the mosque. Also, archaeological investigation reports are adopted to find out the characteristics of the foundations like their dimensions, depths, and materials. Soil investigation reports are used to know the soil layer’s properties and parameters. For non-mentioned soil parameters in soil investigation reports, they are determined depending on the theoretical equations, charts, statistical correlations, and models. A model of soil layers, foundations, and walls is conducted and analyzed using finite element software to determine the deformations of soil layers under the mosque’s brick foundations and walls. According to the analysis, maximum bending moment and shear force were found under the minaret near the Al-Thuaban gate.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"398 - 406"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42341306","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

Numerical modeling of single closed and open-ended pipe pile embedded in dry soil layers under coupled static and dynamic loadings 静动力耦合作用下干土层中单桩封闭式和开放式管桩的数值模拟

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0055

Duaa Al-Jeznawi, I. M. Mohamed Jais, B. Albusoda, Norazlan Khalid

{"title":"Numerical modeling of single closed and open-ended pipe pile embedded in dry soil layers under coupled static and dynamic loadings","authors":"Duaa Al-Jeznawi, I. M. Mohamed Jais, B. Albusoda, Norazlan Khalid","doi":"10.1515/jmbm-2022-0055","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0055","url":null,"abstract":"Abstract For the design of a deep foundation, piles are presumed to transfer the axial and lateral loads into the ground. However, the effects of the combined loads are generally ignored in engineering practice since there are uncertainties to the precise definition of soil–pile interactions. Hence, for technical discussions of the soil–pile interactions due to dynamic loads, a three-dimensional finite element model was developed to evaluate the soil pile performance based on the 1 g shaking table test. The static loads consisted of 50% of the allowable vertical pile capacity and 50% of the allowable lateral pile capacity. The dynamic loads were taken from the recorded data of the Kobe earthquake. The current numerical model takes into account the material non-linearity and the non-linearity of pile-to-surrounded soil contact surfaces. A lateral ground acceleration was adapted to simulate the seismic effects. This research emphasizes modeling the 1 g model by adapting MIDAS GTS NX software. This will, in turn, present the main findings from a single pile model under a combined static and dynamic load. Consequently, the main results were first validated and then used for further deep investigations. The numerical results predicted a slightly higher displacement in the horizontal and vertical directions than the 1 g shaking table. The shear stress–shear strain relationship was predicted. Positive frictional resistance for the closed-ended pile was captured during the first 5 s when low values of acceleration were applied and, consequently, the pile resistance decreased and became negative. Internal and external frictional resistance was captured for the open-ended pipe pile. Overall, frictional resistance values were decreased with time until they reached the last time step with a minimum value. As a result, the evaluation of the current study can be used as a guide for analysis and preliminary design in engineering practice.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"587 - 594"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45965702","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: 8