Hameed Ullah, Farah Jabeen Awan, K. Maqbool, Dianchen Lu
This study presents the computational analysis of heat and mass transfer of an in-compressible electrically conducting non-Newtonian Carreau fluid flow in the presence of buoyancy forces, viscous dissipation, chemical reaction and heat source/sink. Mathematical modelling is made subject to an inclined disk which is linearly stretching also momentum, thermal and concentration boundary layer is used to simplify laws of fluid mechanics. A similarity transformation is implied to convert the governing system of PDE's into system of ordinary differential Eqs. and numerical solution is obtained by the Software Matlab. The impact of pertinent parameters involved in the velocity, temperature and concentration profiles are shown through graphs and the results for Sherwood number, skin friction and Nusselt number are demonstrated through the tables.
{"title":"Computational analysis of Carreau fluid flow in presence with buoyancy force, viscous dissipation and chemical reaction","authors":"Hameed Ullah, Farah Jabeen Awan, K. Maqbool, Dianchen Lu","doi":"10.1093/jom/ufae014","DOIUrl":"https://doi.org/10.1093/jom/ufae014","url":null,"abstract":"\u0000 This study presents the computational analysis of heat and mass transfer of an in-compressible electrically conducting non-Newtonian Carreau fluid flow in the presence of buoyancy forces, viscous dissipation, chemical reaction and heat source/sink. Mathematical modelling is made subject to an inclined disk which is linearly stretching also momentum, thermal and concentration boundary layer is used to simplify laws of fluid mechanics. A similarity transformation is implied to convert the governing system of PDE's into system of ordinary differential Eqs. and numerical solution is obtained by the Software Matlab. The impact of pertinent parameters involved in the velocity, temperature and concentration profiles are shown through graphs and the results for Sherwood number, skin friction and Nusselt number are demonstrated through the tables.","PeriodicalId":508171,"journal":{"name":"Journal of Mechanics","volume":"61 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141922608","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}
Yuk-Wah Tsang, Hsiao-Ju Fu, Pei-Chen Huang, Bishnu-Nand Yadav, De-Shin Liu
In this study, the combined experimental and theoretical estimation on elastic characteristics of EVA (Ethylene-vinyl acetate) copolymer material is demonstrated. Strain rate dependence stress-strain behavior of EVA in raw and foam material form are measured by the quasi-static and dynamic compression test. Simultaneously, the influence of different mould temperature and injection pressure on mechanical properties of EVA foam are investigated. According to the usage scenario of EVA foam in sport footwear application, the EVA foam is generally deformed under higher strain rate as compared with the quasi-static compression condition. For this reason, the stress-strain behavior of EVA foam under high strain rates of 2.66 × 10−3s−1, and 2.66 × 10−2s−1 are estimated. The analytic results revealed that the strain rate slightly enhanced the modulus of EVA foam; and the foregoing strain rate effect is substituting into the classic Young's modulus estimation Eq. of closed cell cellular solid. Accordingly, the strain rate dependence Young's modulus of EVA foam is successfully estimated by both experiment and theoretical estimation.
本研究对 EVA（乙烯-醋酸乙烯）共聚物材料的弹性特性进行了实验和理论估算。通过准静态和动态压缩试验，测量了 EVA 原料和发泡材料的应力应变行为与应变速率的关系。同时，研究了不同模具温度和注塑压力对 EVA 泡沫机械性能的影响。根据 EVA 泡沫在运动鞋应用中的使用情况，与准静态压缩条件相比，EVA 泡沫一般在较高的应变率下变形。因此，我们估算了 EVA 泡沫在 2.66 × 10-3s-1 和 2.66 × 10-2s-1 高应变速率下的应力-应变行为。分析结果表明，应变速率略微提高了 EVA 泡沫的模量；将上述应变速率效应代入闭孔蜂窝固体的经典杨氏模量估算公式。因此，通过实验和理论估算，成功地估算出了 EVA 泡沫的杨氏模量与应变速率的关系。
{"title":"Injection moulding process parameter and strain rate dependence mechanical properties measurement and theoretical estimation of EVA polymer foam","authors":"Yuk-Wah Tsang, Hsiao-Ju Fu, Pei-Chen Huang, Bishnu-Nand Yadav, De-Shin Liu","doi":"10.1093/jom/ufad044","DOIUrl":"https://doi.org/10.1093/jom/ufad044","url":null,"abstract":"\u0000 In this study, the combined experimental and theoretical estimation on elastic characteristics of EVA (Ethylene-vinyl acetate) copolymer material is demonstrated. Strain rate dependence stress-strain behavior of EVA in raw and foam material form are measured by the quasi-static and dynamic compression test. Simultaneously, the influence of different mould temperature and injection pressure on mechanical properties of EVA foam are investigated. According to the usage scenario of EVA foam in sport footwear application, the EVA foam is generally deformed under higher strain rate as compared with the quasi-static compression condition. For this reason, the stress-strain behavior of EVA foam under high strain rates of 2.66 × 10−3s−1, and 2.66 × 10−2s−1 are estimated. The analytic results revealed that the strain rate slightly enhanced the modulus of EVA foam; and the foregoing strain rate effect is substituting into the classic Young's modulus estimation Eq. of closed cell cellular solid. Accordingly, the strain rate dependence Young's modulus of EVA foam is successfully estimated by both experiment and theoretical estimation.","PeriodicalId":508171,"journal":{"name":"Journal of Mechanics","volume":"66 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139385565","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}
Screw thread fastening system is the category of mechanical connection utilizing both wedge and friction actions to transfer clamping force and torque. This fastening system shows the advantages of simple in structure and ease in application. However, its shortcomings include the performance limitation by dimension and precision, stress concentration induced by the notch geometry, loosening in dynamical service, susceptible to atmospheric condition, etc. Therefore, the possible interference on the anti-loosening property of the locknut by noise factors of the ambient temperature, operator characteristics, and type of torque wrench used was investigated using Taguchi method in this study beside the main control factors of type of locknut, fit clearance, and type of lubrication grease. The goal was to evaluate the anti-loosening property of the locknut, i.e. the anti-loosening ratio and axial force ratio, in a more realistic manner. The connection joint of the locknut was subjected to cyclic transverse impact and the anti-loosening property was measured after a specified number of cycles. The loading effect on the surface roughness of thread surface was examined and discussed after the test. It was found that the factor of locknut type dominated the influence over the lubrication grease and fit clearance factors. Through the analysis, the design with optimal combination of the control factors improved the axial force ratio and anti-loosening ratio by 7.8% and 47.9%, respectively.
{"title":"Study on the fastening property of precision locknut under simulated dynamic impact loading with consideration of interference factors","authors":"Huey-Ling Chang, Chih-Ming Chen, Chun-Ying Lee, Zi-Xuan Huang","doi":"10.1093/jom/ufae001","DOIUrl":"https://doi.org/10.1093/jom/ufae001","url":null,"abstract":"\u0000 Screw thread fastening system is the category of mechanical connection utilizing both wedge and friction actions to transfer clamping force and torque. This fastening system shows the advantages of simple in structure and ease in application. However, its shortcomings include the performance limitation by dimension and precision, stress concentration induced by the notch geometry, loosening in dynamical service, susceptible to atmospheric condition, etc. Therefore, the possible interference on the anti-loosening property of the locknut by noise factors of the ambient temperature, operator characteristics, and type of torque wrench used was investigated using Taguchi method in this study beside the main control factors of type of locknut, fit clearance, and type of lubrication grease. The goal was to evaluate the anti-loosening property of the locknut, i.e. the anti-loosening ratio and axial force ratio, in a more realistic manner. The connection joint of the locknut was subjected to cyclic transverse impact and the anti-loosening property was measured after a specified number of cycles. The loading effect on the surface roughness of thread surface was examined and discussed after the test. It was found that the factor of locknut type dominated the influence over the lubrication grease and fit clearance factors. Through the analysis, the design with optimal combination of the control factors improved the axial force ratio and anti-loosening ratio by 7.8% and 47.9%, respectively.","PeriodicalId":508171,"journal":{"name":"Journal of Mechanics","volume":"4 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139389306","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}
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