摘要
利用振动时效技术,从残余应力对固有频率的影响及激振频率对振动时效效果的影响两方面,研究高强铝合金板在振动时效过程中残余应力与固有频率之间的相互作用.结果表明,残余应力场的分布状态直接影响到板的固有频率,振动时效中残余应力的消减或均匀化重分布也随着各阶固有频率的变化而变化,且高阶相对于低阶固有频率受影响的程度更大;激振频率或振型直接影响材料微塑性变形,从而决定了振动时效的效果.
By applying VSR（Vibratory Stress Relief） technology,the influence of residual stress on natural frequency as well as the influence of exciting frequency on the effect of VSR were studied to analyze the interaction of high strength aluminum alloy plate between residual stress and natural frequency in VSR process.The results show that the plate natural frequency is directly influenced by the residual stress distribution characteristics.The natural frequency in each order would change followed by residual stress relaxation or homogenization caused by stress re-distribution during VSR.Moreover,the higher the rank number is,the larger the influence of residual stress on frequency or variation is.On the other hand,micro-plastic deformation mechanism of the material is directly determined by exciting frequency or mode shape,thereby affecting the effect of VSR.
出处
《材料研究与应用》
CAS
2012年第1期14-20,共7页
Materials Research and Application
基金
国家重点基础研究发展规划项目973项目(2005CB623708
2010CB731703)
