本文系统地总结了自紧技术的产生、发展历史和研究现状，分析了在自紧技术中所使用的各种力学模型和有关假设；用Tresca屈服条件和相关联的塑性流动法则以及混合硬化理论研究了液压自紧厚壁圆秋的弹塑性加载和卸载问题，得到了在平面应变、开端和闭端三种情况下的位移、应变、应力和压力膨胀曲线的封闭解，并与实验结果进行了比较；本文用金属性成形理论中的简化分析和弹性力学结合的方法研究了机械自紧厚壁圆管的弹塑性的应力位移、过盈量选择、冲头推力计算以及形状设计等关键问题，得到了具有实际意义的许多重要结论。在理论分析的基础上进行了机械自紧模拟实验，证明了理论分析结果的正确性。本文还提出了利用圆环切口测量厚壁圆管实际自紧度的方法，与实验结果完全一致。由本文所得到的残余应力给出了用热应力场模拟自紧圆管中残余应力进模拟温度场的表达式。本文所得到的结果为自紧技术的研究和应用提供了有价值的理论和实验参考资料。

In this thesis, the history and present situation of autofrettage are summarized systematically. fhe various kinds of mechanical models and its assumptions used in the autofrettage technique are discussed. Using Tresca's yield condition, its associated flow rule and the mixed hardening theory, the analytical solutions have been obtained for elastic-plastic loading and unloading problems in a thick tube autofrettaged by hydraulic pressure. Explicit expressions for the displacements and stresses are given herein under the plane train, opened-end and closed-end conditions, the results gotten in the thesis are compared with experimental datums, the analysis of stress and displacement, choice of excess, calculation of the push force and shape design for the mandrel are considered in a thick tube autofrettaged by the oversize mandrel by the method combined simplify analysis in the mechanics of plastic forming of metals with elastic-plastic mechanics. A lot of important conclusions are given Based on the theory of the thesis, the experiments of imitating the autofrettage process, repressurization and measuring the residual stresses in 'tube are completed. The validity of the theory are proved by the experiments. The method of cutting annular sheet that can be used to get the percent overstrain of the tube is presented The residual stresses in autofrettaged thick tube in the thesis can be expressed by the themal stresses caused by some temperature distributions. The results obtained in the thesis can provide the the recital and experimental references for development and practice of autofrettage.