基于等效损伤线实验建立的疲劳寿命分析方法  

EXPLORATION OF FATIGUE LIFE ANALYSIS METHOD BASED ON EQUIVALENT DAMAGE LINE EXPERIMENTS

作　　者：胡明敏[1] 阎雷[1] 

机构地区：[1]南京航空航天大学材料力学教研室,江苏南京210016

出　　处：《航空学报》2002年第4期338-341,共4页Acta Aeronautica et Astronautica Sinica

基　　金：航空科学基金 (99B5 2 0 17);江苏省自然基金(BK2 0 0 0 0 3 7)资助项目

摘　　要：通过固定一组循环数进行不同应力水平加载试验 ,用韧性耗散法测得三种材料等效损伤线族 ,它显示了损伤场全貌。分析得到的损伤线族方程与实验数据拟合很好 ,由该损伤线族方程导出了复杂加载下损伤累积模型及疲劳寿命计算方法。用该损伤线模型对 3种材料的二级加载试验进行的寿命预测与实验结果较为一致。在等效损伤假设前提下 ,本文的等效损伤线模型更为直接可信。For three kinds of materials, a family of equivalent damage curve was measured on various stress levels using toughness degradation fatigue tests by fixing a group of cyclic numbers. It displays the materials damage in all the damage field. The mathematical function of the equivalent damage curve family is well fitted with the test data. The damage cumulative model and fatigue life prediction in complex loading were derived from the damage curve family function. The comparison of fatigue test data of two stage loading with prediction of the equivalent damage curve method for three kinds of materials shows good agreement.The fatigue life prediction with the model of the equivalent damage curve is more straight and reasonable if the assumption of equivalent damage exists.

关 键 词：等效损伤线 疲劳寿命分析 损伤累积 寿命预测 韧性耗散 水平加载试验 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]