| MATERIALS AND MATRIX COMPOSITES |
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| Three-dimensional Numerical Simulation of Green Metal Powder Compacts Crack Based on DPC-CZM Mixed Model |
| ZHOU Rui1, LIU Zhongwang2, ZHANG Jianguo2, LIU Bingfei1, DU Chunzhi1
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1 School of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China;
2 School of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, China |
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Abstract Elimination and control of green metal powder compacts cracks can guide the production of high-quality powder metallurgy parts. In this work, the modified Drucker-Prager Cap (DPC) model and the cohesive model (CZM) are combined to define the mechanical behavior. The modified DPC model is used to define the solid elements, the cohesive model is used to define the zero-thickness element. Through Brazilian disc and uniaxial compression test, the fracture performance parameters of the blank were obtained, then the Python program was programmed to insert zero-thickness cohesive element in the solid element. The tensile and shear crack of green metal powder compacts under external load are simulated and compared with the experimental results. The results show that combining the exponential cohesive zone constitutive model with the DPC model can be used to describe the change of crack damage zone more accurately, which was also able to reflect the green compacts damage process and crack propagation associated with the zero-thickness elements.
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Published: 12 March 2020
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| Fund:This work was financially supported by the Natural Science Foundation of China (51505483, 51608522) and Scientific Research Foundation of Civil Aviation University of China (2013QD13X). |
| About author:: Rui Zhou, female, associate professor of Civil Aviation University of China, Ph.D. in mechanical engineering, Tianjin University, research direction: plastic forming theory and numerical simulation. She has presided over or participated in many projects at various levels, and has published many papers in SCI, EI, Peking University core journals; Bingfei Liu, male, associate professor of Civil Aviation University of China, master's tutor, Ph.D. in solid mechanics, Beijing Jiaotong University, research direction: intelligent materials and structural mechanics. He has presided over or participated in many projects at various levels, and has published many papers in SCI, EI, Peking University core journals. |
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2020, Vol. 34 
