含缺陷铝合金厚板预拉伸断裂研究

doi:10.3901/JME.2016.12.030

机械工程学报 ›› 2016, Vol. 52 ›› Issue (12): 30-36.doi: 10.3901/JME.2016.12.030

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含缺陷铝合金厚板预拉伸断裂研究

丁华锋, 朱才朝, 宋朝省

重庆大学机械传动国家重点实验室重庆 400044

出版日期:2016-06-15 发布日期:2016-06-15
作者简介:丁华锋,男,1986年出生,博士研究生。主要研究方向为机械零部件断裂与损伤。E-mail：sghwxfqtd@163.com;朱才朝(通信作者),男,1967年出生,博士,教授,博士研究生导师。主要研究方向为机械系统动力学。E-mail：cczhu@cqu.edu.cn;宋朝省,男,1983年出生,博士,副教授。主要研究方向为精密齿轮传动和机械系统动力学。E-mail：chaoshengsong@cqu.edu.cn
基金资助:
国家科技重大专项资助项目(2015ZX04005-011)

Study of Pre-stretching Fracture for Aluminum Alloy Thick Plates with Defects

DING Huafeng, ZHU Caichao, SONG Chaosheng

The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044

Online:2016-06-15 Published:2016-06-15

摘要/Abstract

摘要： 由于材料中存在空洞等缺陷,铝合金厚板在预拉伸过程中易发生断裂,对拉伸设备造成损伤。基于GTN损伤本构方程,建立铝合金板预拉伸断裂模型。基于小试件拉伸断裂试验测试结合数值模拟,确定GTN损伤本构参数,对五种典型厚度铝合金板预拉伸断裂进行研究。计算铝合金板断裂过程中的应力应变及损伤变量的变化规律,并将表面位置和断裂截面位置处的各变量进行对比。结果表明,随着拉伸率的增大,铝合金板由平面应力状态变为应变集中,其部位由正中心位置向边缘偏移,空洞体积分数最大值也由正中心位置转移到应变集中处;随厚度增加断裂应变略有降低,且受初始空洞体积分数的影响较大。通过对不同厚度、不同拉伸率的铝合金板预拉伸分析,得到初始空洞体积分数和初始缺陷尺寸随厚度变化规律。

关键词: GTN本构方程, 材料缺陷, 铝合金板, 预拉伸断裂

Abstract: Due to the existence of defects, such as voids, in the material, the fracture of aluminum alloy thick plate will probably occur during the pre-stretching process, which is extremely harmful for the pre-stretching machine. The GTN damage constitutive is adopted to establish a model for pre-stretching fracture of aluminum alloy plate. The damage constitutive coefficients of GTN model are optimized by tensile fracture experiments and numerical simulations, five typical thicknesses of aluminum alloy plates are selected to investigate the pre-stretching fracture. The stress, strain and damage parameter of aluminum alloy plate during the fracture are calculated, the difference of variations on the surface and the fracture section are compared and discussed. The results show that, as the tension processing, the plane stress state in the aluminum alloy plate changes to strain concentration, and the location of concentration change from the center of the plate to edge position, meanwhile, the variations of the void volume fractions are the same as strain concentration; as the thickness of plate increasing, the fracture strain decreases slowly, and is affected by the void volume fraction significantly. Through the analysis of different thickness and tension ratio of pre-stretching aluminum alloy plates, the varying pattern of initial void volume fraction and the radii of initial voids with the thickness are obtained.

Key words: aluminum alloy plate, defects of material, GTN constitutive, pre-stretching fracture

中图分类号:

TH17

丁华锋, 朱才朝, 宋朝省. 含缺陷铝合金厚板预拉伸断裂研究[J]. 机械工程学报, 2016, 52(12): 30-36.

DING Huafeng, ZHU Caichao, SONG Chaosheng. Study of Pre-stretching Fracture for Aluminum Alloy Thick Plates with Defects[J]. Journal of Mechanical Engineering, 2016, 52(12): 30-36.

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含缺陷铝合金厚板预拉伸断裂研究

Study of Pre-stretching Fracture for Aluminum Alloy Thick Plates with Defects

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