材料期刊网

为建立旋压薄壁管材残余剪切应力的测量方法,并估算强旋2024Al样品管的残余应力,沿单侧纵向切开管段并测量了变形.对变形进行简化的基础上,以弹性力学方法推导出了残余剪切应力的算式,并计算了样品管材的残余应力大小.结果表明：样品管材存在显著的z-θ向残余剪切应力,应力的大小与切口两侧的轴向错开量成正比,应力沿壁厚的分布接近线性,最大值位于管材内表面;本文建立的方法,可用于测量旋压管材的z-θ向剪切残余应力.

In order to establish measuring method of residual shear stress in spun thin-walled tube,and estimate the residual stress in spun 2024Al sample tube,sample tubes are subjected to one side split and the deformation are measured.On the basis of deformation simplification,the residual shear stress fomula are derived through elastic mechanics deduction,and the residual stress of sample tubes are calculated.The results show that the prominent z-θ directional residual shear stress exists in sample tubes,and its value is direct proportional to the axial stagger of sides along the generatrix,the residual shear stress distribution is nearly linear along wall thickness,and the max value lies on the inner surface of the tube.The method established in this paper can be used to measrue the z-θ directional residual shear stress in spun thin-walled tubes.