统一强度理论在厚壁圆筒自增强中的应用

Application of the Unified Strength Theory in Autofrettage of the Thick Wall Cylinder Shell

采用统一强度理论分析了厚壁圆筒自增强中的一些关键问题,得出了非自增强厚壁圆筒弹性极限载荷和塑性极限载荷的统一解的形式,以及弹塑性界面上当量应力最小时的弹塑性界面半径,并导出了当材料拉、压强度不同,及考虑中间主应力的情况下,自增强处理不发生反向屈服时的圆筒径比。另外,利用统一强度理论公式比较了现有的几种强度理论在自增强分析中所得的结果。

This paper presents a new method to solve some key problems in the autofrettage of the thick wall cylin- der shell based on the unified strength theory and concludes the unified solutions of the un-autofrettage thick wall cylinder shell under the elastic and plastic limit loads. The paper also concludes the radius of the boundary when the equivalent load is minimum in the elastic and the plastic zone. In the case of the materials with different tension pressure strength and considering the medium principal stress on material, the ratio of the external radius to internal radius for avoiding the reverse yield is obtained. Besides, the resuh in autofrettage of the thick wall cylinder shell based on Yu＇s unified strength theory is compared with the different results of present strength theories. These re- sults have academic and practical significance in making full use of the properties of the materials and changing structural parameters of the design.