期刊论文

Experiment design and analysis on the effect of vibration stress relief on the relaxation uniformity of surface stress for an Al alloy plate

中文

振动与冲击

1000-3835

2019

38

2

105-109,130

10.13465/j.cnki.jvs.2019.02.016

国家自然科学基金(51475483) 湖南省高校科技创新团队支持计划项目(2014207) 湖南省重点研发计划项目(2018NK2065).

本校为第一机构

通过对7075铝板进行振动时效(VSR)实验研究,观察其对材料表面应力松弛的影响.采用振动模态仿真和X-ray应力测试,对材料表面应力分布、应力释放状况及其均匀化应对策略进行实验分析.结果 显示:VSR在振动台 第5阶固有频率亚共振区开始,对试样造成表面应力松弛,在距离振幅最小的节线远端,应力释放率最大达到18.7％,而靠近节线处,应力松弛效果减弱,只有4.1％,说明振动时效下材料表面应力松弛出现不均匀.根据平台振型弯曲变形特点,提出位置交叉时效方法,以促使激振能均匀分配于材料表面.实验结果表明,铝板表面应力松弛波动由原来的14.6％降到了6.5％,应力分布不均匀得到明显改善,验证了位置交叉VSR方...

The effect of stress relaxation on the surface stress of materials was investigated by experiments of vibration stress relief (VSR) for a 7075 Al-base alloy thin plate. The surface stress distribution, stress relaxation uniformity and handling strategies were analysed by vibration simulations and X-ray stress measurements. The experiments show that the effective VSR starts from the sub-resonance region of 5th order natural frequency of the vibrating plate, and the VSR causes the surface stress relaxation which is of non-uniformity along the nor...