一种考虑材料损伤的低循环疲劳寿命预测方法  

A Method for Predicting Low Cycle Fatigue Life Considering Material Damage

作　　者：商体松[1] 赵明[1] 曹友明[2] 

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]西北工业大学机电学院,西安710072

出　　处：《机械科学与技术》2016年第4期652-656,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：中科院上海高等研究所项目(NBEK-0001)资助

摘　　要：为了更加精确地预测材料的低循环疲劳寿命,对三参数幂函数公式和拉伸滞后能寿命模型进行研究,提出了基于三参数幂函数的损伤能寿命预测模型。分别利用该模型和Manson-Coffin公式对高温合金、钛合金及结构钢等多种材料的低周疲劳试验数据进行拟合并将其分析结果进行对比;根据GH4133合金250℃时的低循环疲劳试验数据,建立了该条件下材料的循环应力-应变曲线和损伤能寿命预测模型,同时对曲线及模型进行验证。结果表明:建立的循环应力-应变曲线能够正确反映该条件下材料的应力与应变之间的关系;所提出的损伤能寿命预测模型对12种材料的低周疲劳试验数据的拟合效果较好,寿命预测精度明显高于Manson-Coffin公式。In order to predict the materials＇ low cycle fatigue life, the Formula of Three-Parameter Power Function and Ostergren model were investigated and a damage energy life prediction model was proposed based on the Three- Parameter Power Function. The low cycle fatigue test data for superalloy, titanium alloy and other metallic materials were used to verify this model, and its analysis results was compared with the Manson-Coffin model＇s laterly. Using the low cycle fatigue test data of superalloy GH4133 at 250~C to establish its cyclic stress-strain curve and damage energy life prediction model, at the same time tested the curve and model. The results show that the established cyclic stress-strain curve can accurately reflect the relation between stress and strain in such circumstances. Besides, the damage energy life prediction model has a better fitting effect for the twelve materials＇ low cycle fatigue test data and its life prediction accuracy is significant higher than that of Manson-Coffin model.

关 键 词：低循环疲劳 三参数幂函数 损伤能 寿命预测 Manson-Coffin公式 

分 类 号：V252[一般工业技术—材料科学与工程]