钛板微成形断裂尺度效应及细观损伤准则

doi:10.3901/JME.2022.16.051

机械工程学报 ›› 2022, Vol. 58 ›› Issue (16): 51-57.doi: 10.3901/JME.2022.16.051

• 特邀专栏: 高性能塑性成形制造(上) • 上一篇下一篇

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钛板微成形断裂尺度效应及细观损伤准则

徐竹田^1,2, 孙磊^1,2, 姜天豪³, 彭林法^1,2, 来新民^1,2

1. 上海交通大学上海市复杂薄板结构数字化制造重点实验室上海 200240;
2. 上海交通大学机械系统与振动国家重点实验室上海 200240;
3. 上海治臻新能源股份有限公司上海 201306

收稿日期:2021-12-01 修回日期:2022-06-16 出版日期:2022-08-20 发布日期:2022-11-03
通讯作者: 彭林法(通信作者)，男，1977年出生，博士，研究员，博士研究生导师。主要研究方向为微/介观成形理论及应用、新能源装备制造。E-mail：penglinfa@sjtu.edu.cn
作者简介:徐竹田，男，1986年出生，副教授。主要研究方向为微细成形及断裂分析。E-mail：zhutianxu@sjtu.edu.cn
基金资助:
国家重点研发计划(2020YFB1505901)和上海光源BL13W1成像线站(2022-SSRF-PT-021281)资助项目

Fracture Size Effect of Titanium Sheets in Microforming and Its Meso Damage Criterion

XU Zhutian^1,2, SUN Lei^1,2, JIANG Tianhao³, PENG Linfa^1,2, LAI Xinmin^1,2

1. Shanghai Key Laboratory for Digital Manufacture of Thin-Walled Structures, Shanghai Jiao Tong University, Shanghai 200240;
2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240;
3. Shanghai Zhizhen New Energy Equipment Co., Ltd., Shanghai 201306

Received:2021-12-01 Revised:2022-06-16 Online:2022-08-20 Published:2022-11-03

摘要/Abstract

摘要： 设计开展了钛薄板拉伸断裂的尺度效应试验，发现随着晶粒增大，延伸率、断裂极限应力均显著下降。通过扫描电镜对断面进行观测发现，随晶粒增大断面由典型密集韧窝断面向河流状解理断面转变。这是由于小晶粒条件下晶界密度高、位错在晶界处堆积对裂纹屏蔽作用显著，裂纹不易扩展；随晶粒增大，位错屏蔽作用减弱、裂纹更容易发生扩展，导致断裂应力及延伸极限降低，裂纹迅速扩展形成河流状断面。为描述钛薄板断裂尺度效应，考虑晶粒大小对位错屏蔽作用的影响，建立考虑该物理机制的损伤扩展失效准则，描述了晶粒增大、位错屏蔽作用减弱导致的损伤扩展加剧。通过与试验结果对比，发现该准则能够预测钛薄板断裂尺度效应并反映其细观机理。

关键词: 钛薄板, 断裂机理, 细观损伤模型, 损伤失效准则, 尺度效应

Abstract: The fracture size effect of titanium sheet was studied by uniaxial tensile experiments. It was found that the elongation and fracture limit stress decreases significantly with the increase of grain size. Observations made on the fracture morphologies show an evident transition from a typical ductile fracture surface of dense dimples to a river-pattern cleavage with the increase of grain size. It is explained that the high density of dislocation accumulation at grain boundaries have a significant shielding effect on the crack propagation for specimens with a small grain size. However, the shielding effect is weakened with the increase of grain size, leading to the easier crack propagation and the reduction of formability. In order to capture the fracture size effect of titanium sheets, a novel meso-scale damage propagation failure criterion considering the grain size effect on the dislocation shielding is established. Compared with the experimental results, the criterion is found capable in predicting the fracture behavior of ultra-thin titanium sheets at different grain size conditions by reflecting the mesoscopic fracture mechanism.

Key words: titanium sheet, fracture mechanism, meso damage mechanical model, damage fracture criterion, size effect

中图分类号:

TG156

徐竹田, 孙磊, 姜天豪, 彭林法, 来新民. 钛板微成形断裂尺度效应及细观损伤准则[J]. 机械工程学报, 2022, 58(16): 51-57.

XU Zhutian, SUN Lei, JIANG Tianhao, PENG Linfa, LAI Xinmin. Fracture Size Effect of Titanium Sheets in Microforming and Its Meso Damage Criterion[J]. Journal of Mechanical Engineering, 2022, 58(16): 51-57.

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钛板微成形断裂尺度效应及细观损伤准则

Fracture Size Effect of Titanium Sheets in Microforming and Its Meso Damage Criterion

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