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针对高压与超高压注水泵系头体的最主要失效形式──疲劳破坏，从疲劳强度的观点出发，用确定最佳超应变度的等疲劳强度自增强设计原则，研究了高压注水泵泵头体的最佳超应变。并用弹塑性有限元法对高压注水泵泵头体的自增强过程进行了分析计算，确定了内外表面的危险点，求出了泵头体在不同自增强压力下的残余应力分布，获得了泵头体的最佳自增强处理压力与最佳超应变，为高压注水泵泵头体的自增强处理提供了理论依据。
In view of the fatigue failure, the most important failure mode of high-pressure and ultrahigh-pressure water injection pump head body is fatigue failure. Based on the principle of self-reinforcement of equal fatigue strength to determine the best super-strain degree, The body’s best super-strain. The elasto-plastic finite element method was used to analyze and calculate the self-reinforcement process of the high-pressure water injection pump head body. The dangerous points of the internal and external surfaces were determined. The residual stress distribution of the pump head body under different self- The best self-reinforced pressure and the best super-strain of the head body provide the theoretical basis for the self-reinforced treatment of high pressure water injection pump head body.