对接接头双轴低周疲劳扩展寿命估算方法比较研究

摘要

分析对接接头在纵向受弯和垂向受压循环载荷作用下的低周疲劳断口形式,提出了一种基于最大剪切面上剪应力和法向应力的双轴疲劳扩展寿命估算方法,并与其它几种估算方法进行了比较,表明该方法具有一定的物理意义和工程实用性.%Fatigue fracture forms are investigated for welding butt joints,which are subject to longitudinal bending cyclic load and vertical compressing cyclic load.Based on the shear strain and the normal strain on the maximal shear strain plane,a method is proposed to estimate the crack propagation life.Compared with other methods,this method is more practicable and has physical significance.