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针对振动时效的实际情况和材料动态力学行为的特点 ,对以往研究中一些未加深入研究的基本问题作振动力学分析。对构件共振时的屈服极限、剪切变形以及转动惯量和子结构的作用进行考察 ,以期为振动时效机理和工艺基础研究提供部分理论上的支持。实际观察分析认为 ,在动态情况下 ,材料拉伸屈服极限大于静态下的屈服极限 1～ 2倍。若想使残余应力与有限的动应力叠加达到动态屈服极限成为不可能 ,而在动态情况下剪切屈服极限较低 ,所以在振动时 ,应力松弛是由于残余应力、剪切应力和拉压应力的剪切应力分量共同作用的结果。
According to the actual situation of vibration aging and the dynamic mechanical behavior of material, some fundamental problems that have not been further studied in previous research are analyzed by vibration mechanics. In this paper, the yield limit, shear deformation, moment of inertia and substructure of component resonance are investigated in order to provide partial theoretical support for the study of vibration aging mechanism and technology. According to the actual observation and analysis, under the dynamic condition, the tensile yield limit of material is greater than 1 ~ 2 times of the yield limit under static state. If it is impossible to reach the dynamic yield limit by superposing the residual stress and the finite dynamic stress, and the shear yield point is lower under dynamic conditions, the stress relaxation during vibration is due to residual stress, shear stress and tensile stress The result of the combined effect of shear stress components.