振动时效的振动力学分析

Analysis of Vibratory Mechanics on Vibratory Stress Relief

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。

Based on the actual situation of vibration aging and dynamic mechanical behavior of applied material,some basic problems in previous studies were analyzed with vibration mechanics.The effects of material's yield strength,shearing strain,rotating inertia and the substructures on vibration aging during the components resonance were investigated so as to get some theoretical support to vibration aging mechanism and practical technology research.In the analysis and investigation,it was found that the material's dynamic tension yield strength was higher than the static tension yield strength by 1～2 times.Therefore,it was impossible to make the combination of residual stress and limited dynamic stress to surpass the dynamic tension yield strength.On the contrary,the dynamic shearing yield strength was lower.Consequently,the stress relaxation by vibration was resulted from interaction of residual stress,shearing stress and the shearing stress component of the tension and press stress field.