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Numerical study of cracking a medium elastic viscoplastique of polyacetal 聚缩醛介质弹性粘塑性开裂的数值研究
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0017
S. A. Reffas, Mohamed Benguidiab, O. Šikula, Houari Adjlout, Habib Lebbal
{"title":"Numerical study of cracking a medium elastic viscoplastique of polyacetal","authors":"S. A. Reffas, Mohamed Benguidiab, O. Šikula, Houari Adjlout, Habib Lebbal","doi":"10.2478/mme-2019-0017","DOIUrl":"https://doi.org/10.2478/mme-2019-0017","url":null,"abstract":"Abstract The objective of this work is the analysis of the fracture behavior of a SENB cylinder with a defect where stress triaxiality is more severe. Numerical simulations are carried out in a 2D mode, to overcome a disadvantageous hypothesis plane strain or plane stress. The mesh sensitivity studies were also undertaken but are not presented here. Indeed, only the results for the most relevant mesh are the subject of the discussion.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"125 - 129"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42628760","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
Case study on the effectiveness of condition monitoring techniques for fault diagnosis of pumps in thermal power plant 状态监测技术在火电厂水泵故障诊断中的有效性案例研究
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0010
Caneon Kurien, A. Srivastava
{"title":"Case study on the effectiveness of condition monitoring techniques for fault diagnosis of pumps in thermal power plant","authors":"Caneon Kurien, A. Srivastava","doi":"10.2478/mme-2019-0010","DOIUrl":"https://doi.org/10.2478/mme-2019-0010","url":null,"abstract":"Abstract A case study was carried out to investigate the effectiveness of condition monitoring techniques in the early failure detection of pumps in a thermal power plant. Various condition monitoring techniques used in this case study involved vibration analysis, motor current signature analysis, noise monitoring and wear debris analysis. These techniques were applied on the three pumps, namely boiler feed water pump, auxiliary cooling water pump and condensate extraction pump, which have to work continuously for the operation of the thermal power plant. Vibration analysis of the auxiliary cooling water pump showed that there is a rising trend in the acceleration values at its driving and non-driving end indicating the deterioration of bearings. Motor current index range of all the pumps was found to be within acceptable limits. Wear debris analysis of lubricant in the hydraulic coupling of boiler feed water pump indicated the presence of sand, dirt and low alloy steel sliding wear particles in it. Condition monitoring techniques have been proved to be an effective technique in early failure detection of pumps.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"70 - 75"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47999557","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: 2
Electrohydrodynamic Instability of a Rotating Walters’ (model B’) Fluid in a Porous Medium: Brinkman model 多孔介质中旋转Walters（模型B'）流体的电流体动力学不稳定性：Brinkman模型
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0019
G. C. Rana, R. Chand, Veena Sharma
{"title":"Electrohydrodynamic Instability of a Rotating Walters’ (model B’) Fluid in a Porous Medium: Brinkman model","authors":"G. C. Rana, R. Chand, Veena Sharma","doi":"10.2478/mme-2019-0019","DOIUrl":"https://doi.org/10.2478/mme-2019-0019","url":null,"abstract":"Abstract In this study, the instability of Walters’ (model B’) viscoelastic fluid in a Darcy-Brinkman-Boussinesq system heated from below saturating a porous medium in electrohydrodynamics is considered. By applying the linear stability analysis and normal modes, the dispersion relation accounting for the effect of Prandtl number, electric Rayleigh number, Darcy number, Brinkman-Darcy number, Taylor number and kinematic viscoelasticity parameter is derived. The effects of electric Rayleigh number, Darcy number, Brinkman-Darcy number and Taylor number on the onset of stationary convection have been investigated both analytically and graphically.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"138 - 143"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45671727","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: 3
Investigation of mechanical behavior of friction stir welded joints of AA6063 with AA5083 aluminum alloys AA6063与AA5083铝合金搅拌摩擦焊接接头力学行为研究
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0008
S. Dharani Kumar, S. Sendhil Kumar
{"title":"Investigation of mechanical behavior of friction stir welded joints of AA6063 with AA5083 aluminum alloys","authors":"S. Dharani Kumar, S. Sendhil Kumar","doi":"10.2478/mme-2019-0008","DOIUrl":"https://doi.org/10.2478/mme-2019-0008","url":null,"abstract":"Abstract Aluminum alloy finds its applications in various sectors of engineering. This paper discusses the investigation of mechanical characteristics of butt weld joints of aluminum alloy AA6063 along with AA5083. An experiment was conducted for different tool rotational speeds of 600 rpm, 800 rpm and 1000 rpm. Specifications of friction stir welding machine were 4 kN axial load and welding speed of 40 mm/min. Friction stir welded (FSW) joints of higher tensile strength, lower flexural strength and lower impact strength with maximum hardness, for the work piece fabricated at 1000 rpm using a high speed steel tool with a cylindrical profile was observed. Better understanding of the effect of tool rotational speed and mechanical properties was illustrated through the experimental result.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"59 - 63"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46786431","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: 11
A Comparative Analysis of Artificial Intelligence-Based Methods for Fault Diagnosis of Mechanical Systems 基于人工智能的机械系统故障诊断方法比较分析
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0016
R. Moghaddam, Navid Moshtaghi Yazdan
{"title":"A Comparative Analysis of Artificial Intelligence-Based Methods for Fault Diagnosis of Mechanical Systems","authors":"R. Moghaddam, Navid Moshtaghi Yazdan","doi":"10.2478/mme-2019-0016","DOIUrl":"https://doi.org/10.2478/mme-2019-0016","url":null,"abstract":"Abstract The present research studied fault diagnosis of composite sheets using vibration signal processing and artificial intelligence (AI)-based methods. To this end, vibration signals were collected from sound and faulty composite plates. Using different time-frequency signal analysis and processing methods, a number of features were extracted from these signals and the most effective features containing further information on these composite plates were provided as input to different classification systems. The output of these classification systems reveals the faults in composite plates. The different types of classification systems used in this research were the support vector machine (SVM), adaptive neuro-fuzzy inference system (ANFIS), k-nearest neighbor (k-NN), artificial neural networks (ANNs), Extended Classifier System (XCS) algorithm, and the proposed improved XCS algorithm. The research results were reflective of the superiority of ANFIS in terms of precision, while this method had the highest process duration with an equal number of iterations. The precision of the proposed improved XCS method was lower than that of ANFIS, but the duration of the process was shorter than the ANFIS method with an equal number of iterations.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"113 - 124"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44966339","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
An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration 切削过程抗自激振动的动态稳定性分析与建模
Mechanics and Mechanical Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0099
A. Motallebia, A. Doniavi, Y. Sahebi
{"title":"An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration","authors":"A. Motallebia, A. Doniavi, Y. Sahebi","doi":"10.2478/mme-2018-0099","DOIUrl":"https://doi.org/10.2478/mme-2018-0099","url":null,"abstract":"Abstract Chatter is a self-excited vibration which depends on several parameters such as the dynamic characteristics of the machine tool structure, the material of the work piece, the material removal rate, and the geometry of tools. Chatter has an undesirable effect on dimensional accuracy, smoothness of the work piece surface, and the lifetime of tools and the machine tool. Thus, it is useful to understand this phenomenon in order to improve the economic aspect of machining. In the present article, first the theoretical study and mathematical modeling of chatter in the cutting process were carried out, and then by performing modal testing on a milling machine and drawing chatter stability diagrams, we determined the stability regions of the machine tool operation and recognized that witch parameter has a most important effect on chatter.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"1287 - 1300"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41641343","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: 2
Experimental Method of Tribological Modelling of Different Coatings of Stainless Steel 不锈钢不同涂层摩擦学建模的实验方法
Mechanics and Mechanical Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0098
Kaid-Ameur Djilali, M. Serrier
{"title":"Experimental Method of Tribological Modelling of Different Coatings of Stainless Steel","authors":"Kaid-Ameur Djilali, M. Serrier","doi":"10.2478/mme-2018-0098","DOIUrl":"https://doi.org/10.2478/mme-2018-0098","url":null,"abstract":"Abstract Fretting wear is a unique form of material degradation caused by small amplitude oscillatory relative motion of two surfaces in contact. Fretting wear is typically encountered at relative displacements of less than 300 μm and occurs in either a gross slip regime [1] (where there is slip displacement across the whole contact), or a partial slip regime (where there are parts of the contact where no slip displacement occurs). Fretting wear is experienced within a wide range of industrial sectors, [2] including aero engine couplings, locomotive axles and nuclear fuel casings [3]. Under higher loads and smaller displacement amplitudes, the contact will be within the partial slip regime, often resulting in fretting fatigue where the dominant damage mode is a reduction in fatigue life [4]. Friction is a very common phenomenon in daily life and industry, which is governed by the processes occurring in the thin surfaces layers of bodies in moving contact. The simple and fruitful idea used in studies of friction is that there are two main non-interacting components of friction, namely, adhesion and deformation [5, 6].","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"1273 - 1286"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48094502","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
Parametric Optimization of Dental Implants 种植牙的参数优化
Mechanics and Mechanical Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0084
Wafa Bensmain, Mohammed Benlebna, B. Serier, B. Abbès, B. Bouiadjra
{"title":"Parametric Optimization of Dental Implants","authors":"Wafa Bensmain, Mohammed Benlebna, B. Serier, B. Abbès, B. Bouiadjra","doi":"10.2478/mme-2018-0084","DOIUrl":"https://doi.org/10.2478/mme-2018-0084","url":null,"abstract":"Abstract Osseointegration is a fundamental phenomenon of dental implantology. It ensures the stability, the safety and the durability of dental implants and predictable clinical success in long-term. The geometric form of the implant is a defining parameter of osseointegration and implant-bone charge transfer. This is the essential constitutes of this study. In fact, we demonstrate using the finite elements method with tridimensional numerical computations, that the geometrical parameters of the implant conditionate the level and the repartition of the stresses, induced in the cortical bone and the spongy bone during the masticatory process, simulated here by dynamic charging. The effect of several parameters [size and conicity of the implant neck, size and radius of curvature of the implant apex] and the shape of the implant corps on the biomechanical behavior of the bone. The latest was analyzed in terms of variation of the equivalent stress induced in the bone. The purpose of this analysis was the developing of an implant form allowing stress relaxation, during the mastication process, in the living tissue.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"1061 - 1076"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47064956","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
Evolution of Tenacity in Mixed Mode Fracture – Volumetric Approach 混合模式断裂韧性演化-体积法
Mechanics and Mechanical Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0073
O. Zebri, H. El Minor, A. Bendarma
{"title":"Evolution of Tenacity in Mixed Mode Fracture – Volumetric Approach","authors":"O. Zebri, H. El Minor, A. Bendarma","doi":"10.2478/mme-2018-0073","DOIUrl":"https://doi.org/10.2478/mme-2018-0073","url":null,"abstract":"Abstract In fracture mechanics most interest is focused on stress intensity factors, which describe the singular stress field ahead of a crack tip and govern fracture of a specimen when a critical stress intensity factor is reached. In this paper, stress intensity factors which represents fracture toughness of material, caused by a notch in a volumetric approach has been examined, taking into account the specific conditions of loading by examining various U-notched circular ring specimens, with various geometries and boundary conditions, under a mixed mode I+II. The bend specimens are computed by finite element method (FEM) and the local stress distribution was calculated by the Abaqus/CAE. The results are assessed to determine the evolution of the stress intensity factor of different notches and loading distances from the root of notch. This study shows that the tenacity is not intrinsic to the material for all different geometries notches.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"931 - 938"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44640356","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
Numerical Study of Residual Thermal Stresses in MMC MMC残余热应力的数值研究
Mechanics and Mechanical Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0086
Tayeb Nehari
{"title":"Numerical Study of Residual Thermal Stresses in MMC","authors":"Tayeb Nehari","doi":"10.2478/mme-2018-0086","DOIUrl":"https://doi.org/10.2478/mme-2018-0086","url":null,"abstract":"Abstract In this paper, numerical study analysis of residual thermal stresses in aluminum matrix reinforced with silicon carbide particles with double-crack has been carried out. is studied in order to determine the thermo-mechanical behavior under the effect of different temperature gradients during cooling. For a more realistic simulation of the microstructure of these materials subjected to different loadings, a representative volume element may be used. In this paper, three different types of crack width a = 5 μm, 10 μm, 15 μm, has been carried. The thermal residual stresses are calculated by considering a wide range of cracks of different penetrations proximity to particle of 0.1, 0.2 and 0.5 μm. regarding the distribution of the stresses along the plane of the crack and in vicinity of the particle, results show that the penetration of the crack in the matrix causes an asymmetry. The inter-distance between crack and particle plays an important role regarding the generation of residual stresses. The lower the inter-distance, the higher the internal stresses of normal residual stresses of σzz.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"1099 - 1110"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46661081","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
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