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Modeling of material deformation behavior in micro-forming under consideration of individual grain heterogeneity 被引量:3
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作者 Zhen-wu MA Xuan PENG +1 位作者 chun-ju wang Zi-yang CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第11期2994-3005,共12页
This study aims to develop a model to characterize the inhomogeneous material deformation behavior in micro-forming.First,the influence of individual grain heterogeneity on the deformation behavior of CuZn20 foils was... This study aims to develop a model to characterize the inhomogeneous material deformation behavior in micro-forming.First,the influence of individual grain heterogeneity on the deformation behavior of CuZn20 foils was investigated via tensile and micro-hardness tests.The results showed that different from thick sheets,the hardening behavior of grains in the deformation area of thin foils is not uniform.The flow stress of thin foils actually only reflects the average hardening behavior of several easy-deformation-grains,which is the reason that thinner foils own smaller flow stress.Then,a composite modeling method under consideration of individual grain heterogeneity was developed,where the effects of grain orientation and shape are quantitatively represented by the method of flow stress classification and Voronoi tessellation,respectively.This model provides an accurate and effective method to analyze the influence of individual grain heterogeneity on the deformation behavior of the micro-sized material. 展开更多
关键词 MICRO-FORMING size effects inhomogeneous material behavior grain heterogeneity composite modeling
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Mechanism of size effects in microcylindrical compression of pure copper considering grain orientation distribution 被引量:1
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作者 Chuan-Jie wang chun-ju wang +2 位作者 Bin Guo De-Bin Shan Yan-Yan Chang 《Rare Metals》 SCIE EI CAS CSCD 2013年第1期18-24,共7页
In microscale deformation, the magnitudes of specimen and grain sizes are usually identical, and size- dependent phenomena of deformation behavior occur, namely, size effects. In this study, size effects in micro- cyl... In microscale deformation, the magnitudes of specimen and grain sizes are usually identical, and size- dependent phenomena of deformation behavior occur, namely, size effects. In this study, size effects in micro- cylindrical compression were investigated experimentally. It was found that, with the increase of grain size and decrease of specimen size, flow stress decreases and inhomogeneous material flow increases. These size effects tend to be more distinct with miniaturization. Thereafter, a modified model considering orientation distribution of surface grains and continuity between surface grains and inner grains is developed to model size effects in micro- forming. Through finite element simulation, the effects of specimen size, grain size, and orientation of surface grains on the flow stress and inhomogeneous deformation were analyzed. There is a good agreement between experimental and simulation results. 展开更多
关键词 MICROFORMING Cylindrical compression Sizeeffects Grain orientation Inhomogeneous deformation
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