The influence of overstrain, Bauschinger effect and material strengthening on the autofrettage pressure and reverse yielding is analyzed, and the formulas for calculating the autofrettage residual stress and pressure and Bauschinger effect coefficient are obtained based on bilinear model of material. 分析了超应变度、Bauschinger效应和材料强化对自增强压力和反向屈服的影响,得到了基于材料双线性理论模型的自增强残余应力、临界径比、自增强压力和Bauschinger效应系数计算式;
The tangential residual stress of the external surface of the autofrettage tubes was measured by X rays. According to the model which includes the strain hardening after reverse yielding and regards Bauschinger 'effect, the calculation method of elastic strength pressure was presented. 对自增强圆筒进行X射线外表面切向残余应力测量,在模型考虑材料反向屈服后的强化现象和鲍辛格效应影响的基础上,给出了自紧圆筒强度的计算方法。