铝合金焊接结构塑性变形及断裂失效预测方法

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英文篇名：Plastic Deformation and Failure Prediction of Aluminum Alloy Welded Structures 作者：胡朝辉 ; 杜鹏 ; 段利斌 ; 周聪 ; 杜展鹏 英文作者：HU Zhaohui;DU Peng;DUAN Libin;ZHOU Cong;DU Zhanpeng;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University;School of Automotive and Traffic Engineering,Jiangsu University;State Key Laboratory of High Performance Complex Manufactring,Hunan University; 关键词：铝合金焊接结构 ; 局部材料性能 ; 损伤模型 ; 开裂 英文关键词：welded aluminum structure;;local material properties;;GTN model;;fracture 中文刊名：QCYK 英文刊名：Chinese Journal of Automotive Engineering 机构：湖南大学汽车车身先进设计制造国家重点实验室;江苏大学汽车与交通工程学院;湖南大学高性能复杂制造国家重点实验室; 出版日期：2019-03-20 出版单位：汽车工程学报 年：2019 期：v.9;No.49 基金：国家重点研发计划资助项目(2016YFE0102200);; 湖南省自然科学基金(2017JJ3030) 语种：中文; 页：QCYK201902006 页数：8 CN：02 ISSN：50-1206/U 分类号：41-48

摘要

铝合金焊接接头力学性能不均匀加大了焊接结构变形及开裂失效预测的难度。通过特殊样件拉伸试验,结合有限元反求方法获得了铝合金焊接接头焊缝、热影响区局部材料参数,建立从细观损伤力学角度预测铝合金焊接结构变形开裂的GTN(Gurson-Tvergaard-Needlemen)损伤模型。将焊接接头按照材料性能差异进行分区,构建精细有限元模型,采用Ls-dyna软件结合GTN损伤模型对铝合金拼焊薄壁梁结构轴向压溃变形及开裂失效进行了预测,预测结果与试验吻合很好,验证了该方法的有效性。
        The inhomogeneous mechanical properties of aluminum alloy welded joints increase the difficulty in predicting the deformation and failure of the welded structures. The local material parameters for the welds and heat-affected zone of aluminum welded joints were obtained by the special sample tensile test combined with the inverse finite element method. The GTN damage model was established to predict the deformation and fracture of welded aluminum structures from the perspective of damage mechanics in mesoscopic scales. The software Ls-dyna combined with the GTN damage model was used to predict the axial compressive deformation and fracture of the welded aluminum structure. The predictions are compared with the experimental results to validate the effectiveness of the method.

引文

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