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RISS 인기검색어
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- 저자 : Guizhong Tian (검색결과 2 건)
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Guizhong Tian,Zhengyu Ma,Donghao Zhao,Honggen Zhou,Xuwen Jing,Zhancheng Xie,Guochao Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
The residual stresses (RS) generated during the thermal processing processes such as casting and heat treatment is one of the fundamental causes of irreversible deformation of diesel engine bodies (DEBs). However, previous studies only focused on the RS generated from casting or the effect of annealing heat treatment on the RS in castings unilaterally, and the analytical results were far from the actual conditions. Therefore, this paper proposes a comprehensive research method to consider the whole dynamic evolution of the casting from the RS generated by casting to the stress relief by heat treatment. Numerical simulation of DEBs casting process is carried out by PROCAST, and the results of casting RS obtained from the simulation are imported into ABAQUS, and then numerical simulation of annealing heat treatment is carried out for the DEB casting model with casting RS, so as to realize the analysis of dynamic evolution of RS from casting to heat treatment.
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Qiang He,Jun Feng,Honggen Zhou,Guizhong Tian 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8
Circular honeycombs are extensively used to absorb impact energy considering its good energy absorption properties. Rather than focusing on the existing perfect honeycomb, effects of concentrated filling inclusions on the in-plane dynamic behavior of circular honeycomb structure are studied in detail by using finite element simulations. The crushing model of honeycomb under in-plane impact is established which then is used to investigate the influences of packing ratio, defect distribution area and impact velocity on the deformation mode and the plateau stress. Investigation results show that the deformation model of imperfect honeycomb can still be classified into three types: Quasi-static mode, transition mode and dynamic mode; However, the value of packing ratio and defect location may seriously influence localized deformed band of transition mode; The plateau stress of the honeycomb relies on the defect location except for the packing ratio; The filling inclusions defect concentrated in sub-region 2 is more beneficial to improve the energy-absorption capacity; Especially under middle or low impact velocities, it displays higher sensitivity; The crushing plateau stress of honeycomb with a = 0.36 and defect concentrated in sub-region 2 is even improved about 56.9 % under impact velocity 100 m/s. These results can provide valuable suggestions in the study and design of other honeycomb structures.
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