表面强化对壳体结构残余应力影响规律研究

摘要

设计、制造了具有真实零部件几何特征的试件并利用湿喷工艺进行表面强化,试验件一侧表面受强化,背侧表面不受强化.应变数据及分析表明,试验件背侧处于压应力状态,具有纵向加强筋的壳体背侧压应力低于无加强筋结构,横向约束及刚性影响加强筋壳体背侧残余应力状态,降低喷丸强度及增加壳体厚度可以降低背侧残余应力.研究成果对优化表面强化工艺以及壳体结构设计具有重要借鉴意义.%Shell component like specimens were designed and then produced.One side of surface was shot peening processed by wet blast processed and the back surface was not.Experimental date and analytical results indicated that compressive residual stress exists on the back surface,the amount of residual stress is higher on pure shell specimen than shell structure reinforced by ribs on back surface,tensile stress could be produce by increasing transverse stiffness,residual stress is controlled by parameters of wall thickness and shot peening intensity and it can be decreased by the lower shot peening intensity or increasing the wall thickness.The founding of this research can be helpful in improving shot peening parameter and modifying the topology of components.