交变载荷作用下平面应力状态焊接接头焊趾处应力应变理论解的推导

Theory solution of weld toe stress and strain of weld joint under cyclic loading in plane stress condition

摘要: 基于弹塑性力学理论计算对接接头交变载荷作用下焊趾处应力和应变,以准确预测交变载荷作用下平面应力状态对接接头焊趾处的应力和应变值为目标,考察了不同加载情况下平面应力状态对接接头焊趾处应力和应变的理论计算方法,并给出了交变载荷作用下平面应力状态对接接头焊趾处应力和应变的理论解.结果表明,在材料参数、载荷大小以及焊趾应力集中系数已知的前提下,根据提出的理论解的计算式可获得相应载荷时接头焊趾处的应力应变,为焊接接头在交变载荷下的疲劳失效预测提供理论指导.

Abstract: A theoretical method was proposed to precisely predict stress and strain in weld toe of butt joint under cyclic loading in plane stress condition, based on elastic-plastic mechanics theory. The analytical solutions of stress and strain in weld toe of butt joint under cyclic loading in plane stress condition were obtained. The stress and strain in weld toe could be calculated by analytical solution when the material properties, load value and stress concentration factor on the weld toe were known. The proposed method could predict fatigue failure of welded joint under cyclic loading.