|
摘要：
|
|
韧性断裂准则作为材料成形极限中的重要指标,对于准确预测金属内部和表面韧性破坏发生的时间和位置、工艺制定和模具设计具有重要的意义。以45钢为材料,采用不同形式的试件进行了拉伸、压缩、剪切、扭转等实验,并利用金属塑性成形模拟专业软件对实验过程进行数值模拟,对工程中广泛使用的11种韧性断裂准则进行分类对比研究。指出Normalized Cockroft & Latham和Brozzo断裂准则比较适用于高应力三轴度成形过程,而Ayada和Rice-Tracy断裂准则更适用于较低应力三轴度成形过程。
|
|
Ductile fracture criterion is a key parameter in material forming limitation.Accuracy predicting surface and internal failure in plastic deformation process affect greatly the technology design of workpiece and die.Tension,compression,torsion and shearing test on 45 steel were utilized for providing the experimental values of the critical values at fracture,and 11 kinds of usually used ductile fracture criterions were selected to simulate the physical experiments and their relative accuracy for predicting and quantifying fracture initiation sites was investigated.The comparing results show that metal forming process under high triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture criteria,but the Ayada and general Rice-Tracey model work very well for the low triaxiality cases.
|
|
基金项目：
|
|
国家自然科学基金资助项目(50875156)
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]刘先兰,张文玉,刘楚明.细观损伤力学及其在金属塑性加工中的应用[J].锻压技术,2008,33(1):9-13.
[2]余心宏,翟妮芝,翟江波.应用韧性断裂准则预测板料的成形极限图[J].锻压技术,2007,32(5):44-47
[3]虞松,陈军,阮雪榆.韧性断裂准则的试验与理论研究[J].中国机械工程,2006,17(19):2049-2052.
[4]Yu Song,Xie Xiaolong,Zhang Jie,et al.Ductile fracturemodeling of initiation and propagation in sheet-metal blankingprocesses[J].Journal of Materials Processing Technology,2007,187-188:169-172.
[5]杨锋平,孙秦.韧性金属材料渐进断裂的有限元算法研究[J].金属学报,2008,44(4):489-494.
[6]Benseddiq N,Imad A.A ductile fracture analysis using a lo-cal damage model[J].International Journal of Pressure Ves-sels and Piping,2008,85(4):219-227.
[7]Saanouni K.On the numerical prediction of the ductile frac-ture in metal forming[J].Engineering Fracture Mechanics,2008,75(11):3545-3559.
[8]Fahrettin Ozturk,Daeyong Lee.A new methodology forductile fracture criteria to predict the forming limits[J].Journal of Materials Engineering and Performance,2007,16(2):224-228.
[9]Bao Yingbin,Tomasz Wierzbicki.On fracture locus in the e-quivalent strain and stress triaxiality space[J].Transactionof the ASME,2004,46(1):81-98.
|
|
服务与反馈：
|
|
【本网站尚未开通全文下载服务】【加入收藏】
|
|
|
|
