金属拉深旋压成形时损伤破裂预测研究

doi:10.3901/JME.2023.10.066

机械工程学报 ›› 2023, Vol. 59 ›› Issue (10): 66-75.doi: 10.3901/JME.2023.10.066

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金属拉深旋压成形时损伤破裂预测研究

夏琴香, 张义龙, 肖刚锋, 晏畅

华南理工大学机械与汽车工程学院广州 510640

收稿日期:2022-06-04 修回日期:2022-11-10 出版日期:2023-05-20 发布日期:2023-07-19
通讯作者: 肖刚锋(通信作者),男,1987年出生,博士,副教授。主要研究方向为先进成形与模具及装备技术。E-mail:xiaogf@scut.edu.cn E-mail:xiaogf@scut.edu.cn
作者简介:夏琴香,女,1964年出生,博士,教授,博士研究生导师。主要研究方向为先进成形与模具及装备技术。E-mail:meqxxia@scut.edu.cn
基金资助:
国家自然科学基金青年科学基金(51705159)和广东省自然科学基金(2021A1515011074，2019A1515012132)资助项目。

Research on Damage and Fracture Prediction of Metal Deep Drawing Spinning

XIA Qinxiang, ZHANG Yilong, XIAO Gangfeng, YAN Chang

School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640

Received:2022-06-04 Revised:2022-11-10 Online:2023-05-20 Published:2023-07-19

摘要/Abstract

摘要： 破裂是金属拉深旋压成形最主要缺陷之一,通过分析拉深旋压时的破裂形式、受力特征及裂纹形成过程,提出构建适用于金属拉深旋压的韧性断裂准则,以实现对拉深旋压破裂缺陷的准确预测与控制。以Haynes230镍基高温合金为研究对象,通过分析拉深旋压应力特征,指出最大主应力是导致筒壁中部轴向破裂、最大切应力是导致口部切向破裂的主要原因,并构建出考虑拉深旋压两种破裂形式的修正Lou准则。设计不同应力三轴度的单向拉伸试验,标定韧性断裂准则损伤参数;基于拉深旋压试验,验证适用于拉深旋压的韧性断裂准则,预测镍基高温合金拉深旋压时的损伤破裂。结果表明,由于Lou准则仅考虑了最大切应力的影响,导致工件提前形成轴向破裂。修正的Lou准则同时考虑最大主/切应力的影响,能准确预测拉深旋压破裂的形成位置与形成时刻,其破裂时刻预测的相对误差仅为7%。拉深旋压时当出现口部鼓包缺陷后,损伤在沿鼓包区迅速积累,导致裂纹从鼓包区沿轴向扩展形成轴向破裂。由于旋轮接触区材料在外表面受压应力、内表面受拉应力,使得筒壁中部的内表面更易形成切向破裂。

关键词: 镍基高温合金, 拉深旋压, Lou准则, 修正的韧性断裂准则, 破裂预测

Abstract: Fracture is one of the main defects during metal deep drawing spinning(DDS). In order to accurately predict and control the fracture defects during DDS, a ductile fracture criterion for DDS is proposed by analysing the fracture form, stress characteristics and crack formation process. Ni-based superalloy of Haynes 230 is selected as the research object and its stress characteristics during DDS was analysed. It is pointed out that the maximum principal stress and the maximum shear stress are the main reasons for the formation of tangential and axial fracture in the middle and mouth of the cylinder wall respectively. The modified Lou criterion considering the two fracture forms of DDS is constructed. Uniaxial tensile tests with different stress triaxiality are designed to calibrate the damage parameters of ductile fracture criterion. The ductile fracture criterion for DDS is verified by the DDS experiments, and the fracture of Ni-based superalloy during DDS is predicted. The results show that the Lou criterion only considers the influence of the maximum shear stress, which leads to the axial fracture of the workpiece in advance. The modified Lou criterion takes into account the influence of both the maximum principal and shear stress, and can accurately predict the forming position and the forming time of fracture during the DDS. The relative error of the prediction of the fracture time is only 7%. The damage accumulates rapidly along the bulge area when the mouth bulge defect appears during DDS, which leads to the crack propagation along the axis direction from the bulge area and forms the axial fracture. Because of the compressive stress on the outer surface and the tensile stress on the inner surface of the contact area of the roller, the inner surface in the middle of the cylinder wall is more prone to form tangential fracture.

Key words: Ni-based superalloy, deep drawing spinning, Lou criterion, modified ductile fracture criterion, fracture prediction

中图分类号:

TG306

夏琴香, 张义龙, 肖刚锋, 晏畅. 金属拉深旋压成形时损伤破裂预测研究[J]. 机械工程学报, 2023, 59(10): 66-75.

XIA Qinxiang, ZHANG Yilong, XIAO Gangfeng, YAN Chang. Research on Damage and Fracture Prediction of Metal Deep Drawing Spinning[J]. Journal of Mechanical Engineering, 2023, 59(10): 66-75.

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金属拉深旋压成形时损伤破裂预测研究

Research on Damage and Fracture Prediction of Metal Deep Drawing Spinning

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