Tensile fracture of ultrafine grained aluminum 6061 sheets by asymmetric cryorolling for microforming

Tensile fracture of ultrafine grained aluminum 6061 sheets by asymmetric cryorolling for microforming
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微成型不对称冷冻轧制超细晶粒铝 6061 板材的拉伸断裂

DOI:
10.1177/1056789514538083
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发表时间:
2014-05
影响因子:
4.2
通讯作者:
Kong C.
Kong C.
中科院分区:
工程技术2区
文献类型:
--
作者:
Yu H.L.;Tieu K.;Lu C.;Lou Y.S.;Liu X.H.;Godbole A.;Kong C.

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超细晶薄板材断裂机理的尺寸效应是微成形中一个尚未解决的问题。本文介绍了一种非对称冷轧超细晶铝6061板材的拉伸试验,研究了轧制和时效过程中的断裂行为和剪切断裂角。用扫描电子显微镜对断口进行了观察。采用非耦合Cockcroft-Latham和Tresa准则和耦合Gurson-Tvergaard-Needleman损伤准则对拉伸试验进行了有限元模拟。结果表明,随着道次的增加,剪切断裂角从90°逐渐减小到°。采用Gurson-Tvergaard-Needleman准则的模拟结果显示出与实验结果相似的趋势。文中还对拉伸试验中的断裂机理和尺寸效应进行了讨论。
The size effect on the mechanism of fracture in ultrafine grained sheets is an unsolved problem in microforming. This paper describes a tensile test carried out to study the fracture behavior and the shear fracture angles of both rolled and aged ultrafine grained aluminum 6061 sheets produced by asymmetric cryorolling. A scanning electron microscope was used to observe the fracture surface. The finite element method was used to simulate the tensile test using the uncoupled Cockcroft–Latham and Tresca criteria and the coupled Gurson–Tvergaard–Needleman damage criterion. It was found that the shear fracture angle decreases gradually from 90° to 64° with an increasing number of passes. The results of simulations using the Gurson–Tvergaard–Needleman criterion show trends similar to the experimental ones. The paper also presents a discussion on the fracture mechanism and the size effect during the tensile test.
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影响因子: 4.1
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