基于应变损伤的热挤压模具疲劳失效预测模型及验证  

Fatigue failure prediction model and verification of hot extrusion die based on strain damage

作　　者：张彦敏[1,2] 张帅帅 韩文奎 陈赛[1,2] 赵培峰[1,2] 葛学元 ZHANG Yan-min;ZHANG Shuai-shuai;HAN Wen-kui;CHEN Sai;ZHAO Pei-feng;GE Xue-yuan(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Key Laboratory of Non-Ferrous Materials Science&Processing Technology,Luoyang 471023,China;Beijing National Innovation Institute of lightweight Ltd.,Beijing 100083,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023 [3]北京机科国创轻量化科学研究院有限公司,北京100083

出　　处：《塑性工程学报》2019年第6期142-147,共6页Journal of Plasticity Engineering

基　　金：国家重点研发计划资助项目(2016YFB0300400);河南省杰出人才创新基金资助项目(18210151003);河南省重点攻关项目(20174GJPT1)

摘　　要：以典型热挤压凸模服役工况为切入点,通过有限元数值模拟获取模具危险部位的加载历程,采用Neuber算法对其进行修正,获得归一化处理之后的载荷谱作为疲劳分析的加载曲线;基于Manson-Coffin模型,实验获取模具材料在服役温度下的拉伸性能,得出材料的应变-寿命曲线,建立基于应变损伤的模具疲劳失效预测模型。针对铝合金挤压件特定工况,进行模具在球化退火+1020℃油淬+580℃×2 h两次回火处理后的疲劳寿命预测,并对模型进行验证。结果表明:所建模型预测寿命为1318次,实际寿命为1120次,模具失效部位、服役寿命与预测结果吻合良好。The service conditions of typical hot extrusion punches were selected as the start point,the loading history of the dangerous part of die was obtained by finite element numerical simulation,which was modified by Neuber algorithm,and the obtained load spectrum with normalization was used as the loading curve of fatigue analysis.Based on the Manson-Coffin model,the tensile properties of the die materials at service temperature were obtained by experiments,and the strain-life curve of material was obtained.The fatigue failure prediction model based on strain damage was established.Aiming at the specific working conditions of aluminum alloy extrusion parts,the fatigue life prediction of the die was carried out after spheroidizing annealing,1020℃oil quenching,two tempering treatments of 580℃×2 h,and the model was validated.The results show that the die life predicted by the estabished model is 1318 times,and the actual die life is 1120 times,the failure position and service life of the die are in good agreement with the prediction results.

关 键 词：疲劳失效 预测模型 热挤压 应变损伤 模具 

分 类 号：TG142.2[一般工业技术—材料科学与工程]