Journal of Mechanics最新文献

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Computational analysis of Carreau fluid flow in presence with buoyancy force, viscous dissipation and chemical reaction 存在浮力、粘性耗散和化学反应的卡诺流体流动的计算分析

Journal of Mechanics Pub Date : 2024-08-09 DOI: 10.1093/jom/ufae014

Hameed Ullah, Farah Jabeen Awan, K. Maqbool, Dianchen Lu

引用次数: 0

Injection moulding process parameter and strain rate dependence mechanical properties measurement and theoretical estimation of EVA polymer foam EVA 聚合物泡沫的注塑成型工艺参数和应变率相关力学性能测量与理论估算

Journal of Mechanics Pub Date : 2024-01-04 DOI: 10.1093/jom/ufad044

Yuk-Wah Tsang, Hsiao-Ju Fu, Pei-Chen Huang, Bishnu-Nand Yadav, De-Shin Liu

{"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}

引用次数: 0

Study on the fastening property of precision locknut under simulated dynamic impact loading with consideration of interference factors 考虑干扰因素的精密锁紧螺母在模拟动态冲击载荷下的紧固性能研究

Journal of Mechanics Pub Date : 2024-01-03 DOI: 10.1093/jom/ufae001

Huey-Ling Chang, Chih-Ming Chen, Chun-Ying Lee, Zi-Xuan Huang

{"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}

引用次数: 0