复合材料气瓶的多轴疲劳寿命预测研究

RESEARCH ON THE FATIGUE LIFE PREDICTION OF COMPOSITE VESSEL UNDER MULITA-AXIAL LOADING

采用等效应变法计算气瓶疲劳寿命的ASME压力容器规范,不能考虑多轴非比例加载效应,具有明显的不足。针对复合材料气瓶,采用修正的Brown-Miller算法研究其多轴低周疲劳寿命,并分析了自紧压力、金属内衬厚度和单层缠绕层厚度对复合材料气瓶疲劳寿命的影响,给出了提高复合材料气瓶疲劳寿命的方法。

There are obvious disadvantages in the ASME pressure vessel code,which is used to calculate the fatigue life of cylinders by the adoption of equivalent strain method,because it cannot take account of the multi-axial non-proportional loading effect. This paper studies the multi-axial low-cycle fatigue life of composite cylinders by adopting the corrected Brown-Miller algorithm as well as the effect of autofrettage pressure,metal liner thickness and single layer thickness on the composite cylinders＇ fatigue life,and gives a method for increasing the composite cylinders＇ fatigue life.