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- 저자 : Linwei Zhu (검색결과 3 건)
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The State of the Art of Finite Element Analysis in Mechanical Clinching
Yue Zhang,Honghe Xu,Ruitao Peng,Yan Lu,Linwei Zhu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
Clinching technology is a mechanical connection technology that is applied to connect metal or non-metal sheet materials. It is widely used in different applications, such as automobile, aircraft, household appliances and other industries. In order to reduce weight, save energy, reduce fuel consumption, reduce pollution and curb global warming, lightweight structures with clinched joint are increasingly used in transportation. The finite element technology is popularized in engineering, so that it can get similar results with the test after investing less time, manpower, energy and material resources, which is conducive to the prediction and smooth progress of the test. A review of the finite element analysis of clinching technology is provided in the present paper. The article’s work also discusses the strength of the clinched joint, the factors influencing the clinched joint’s strength, the failure mechanism of the clinched joint, etc. Furthermore, the novel technologies of clinching as well as the finite element models and methods used in clinching, are introduced. The present paper’s main objective was to review the recent developments in the finite element analysis of clinching and provide a basis for further investigation in this area of research.
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Fabrication of Hollow Polymer Microchannels Using the MIMIC Technique with Subsequent Heat Treatment
Weiren Li,Wenqiang Xing,Fengzhou Zhao,Lichun Zhang,Yupeng Huang,Jinxiu Li,Linwei Zhu,Zheng Xu,Dengying Zhang 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.8
The hollow polymer microchannels with different shapes and dimensions have been fabricated by the MIMIC method and the heating process for the first time. The smallest cross-sectional dimensions of hollow polymer microchannels were about 2.6 μm in the vertical direction and 3.5 μm in the horizontal direction. The length of hollow polymer microchannels increased parabolically with the heating temperature in the range of 30–135 °C. And the influence of the PDMS mold crosssectional areas on the length of the microchannels was invetigated. Furthermore, the forming mechanism of hollow polymer microchannels was disscussed in detail. This technique provides a cheap, simple and controllable way for the preparation of microchannels.
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Joinability and Mechanical Properties of Clinched Joints of Different Aluminum Alloys
Yue Zhang,Honghe Xu,Ruitao Peng,Yan Lu,Linwei Zhu 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.11
The joints of four aluminum alloy (7075, 5754, 6061, 1060) sheets were prepared using the clinching process with different die assemblies, and the forming and mechanical properties of the produced joints were evaluated using different testing procedures. The neck thickness, undercut values, bottom thickness, and joint dimensions of the joints were measured to investigate the joinability. The forming quality parameters, strength, failure displacement, failure mode, and energy absorption of the joints were investigated using the tensile shear test and peeling test. It was revealed that all four aluminum alloy sheets could form clinched joints with a suitable undercut, neck thickness and different die fits. A combination of SR5202 and SR703.12 dies resulted in an optimum joint quality for different sheets. Both neck thickness and the undercut amount played a major role in the determination of the strength of the joints. The best mechanical properties of the single-lap and cross joints were found for the sheets made from aluminum alloys 7075 and 6061. The aluminum alloy 5754 clinched joints exhibited slightly deteriorated mechanical properties but had the highest energy absorption capacity of the joints. However, the lower yield strength of aluminum alloy 1060 led to poor mechanical properties of these joints. All the single lap joints showed a tensile-shear failure mode of the upper sheet material, whereas the peel failure modes of the cross joints showed neck pull-off failure, neck fracture failure, and neck mixed failure.
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