摘要
为提升钛合金零件工作的可靠性与经济性,就激光冲击对钛合金机械零件疲劳特性的影响展开分析。根据激光冲击原理,得到冲击波压力与激光功率密度间关系,通过调整公式获取理想的冲击波压力值,优化激光器的各项参数;利用等离子高效产生冲击波,提升残余应力,得到应力分布方式与实际交变拉应力变化对疲劳强度与抗腐蚀性的影响,使疲劳裂纹得到有效控制;根据轮廓算术平均偏差和微观波浪度与点高度和,获得激光冲击与粗糙参数之间的负相关性,分析得出激光冲击对钛合金零件疲劳特性的影响。经过仿真实验,发现激光冲击能够有效降低表面粗糙度,令应力水平显著提升,从而增强耐疲劳、耐磨损性能,其对疲劳特性的影响有着主导性的作用。
In order to improve the reliability and economic efficiency of titanium alloy parts,this article analyzes the impact of laser shock on the fatigue characteristics of titanium alloy mechanical parts.According to the principle of laser shock,the relationship between shock wave pressure and laser power density is obtained.The ideal shock wave pressure value is obtained by adjusting the formula,and the parameters of the laser are optimized.Using plasma to efficiently generate shock waves and enhance residual stress,the effects of changes in stress distribution mode and actual alternating tensile stress on fatigue strength and corrosion resistance are obtained,so that fatigue cracks can be effectively controlled.According to the contour arithmetic mean deviation and the sum of the micro wave degree and the point height,the negative correlation between the laser shock and the roughness parameters is obtained,and the influence of the laser shock on the fatigue characteristics of titanium alloy parts is analyzed After simulation experiments,it was found that the laser impact can effectively reduce the surface roughness and significantly increase the stress level,thereby enhancing the fatigue resistance and abrasion resistance,which has a dominant effect on the fatigue characteristics.
作者
杜健辉
廖聪
DU Jianhui;LIAO Cong(College of Mechanical and Electrical Engineering,Lingnan Normal University,Zhanjiang Guangzhou 524048,China)
出处
《激光杂志》
北大核心
2020年第6期193-197,共5页
Laser Journal
基金
国家自然科学基金资助项目(No.51705228)
广东省扬帆计划引进创新创业团队专项资助项目(No.2014YT02C049)
广东省自然科学基金资助项目(No.2018A030307017)。
关键词
激光冲击
钛合金
疲劳特性
残余应力
表面粗糙度
laser shock
titanium alloy
fatigue characteristics
residual stress
surface roughness
