激光喷丸强化铝合金疲劳特性的数字化分析

激光喷丸强化(LSP)是一种基于冲击波力效应的非传统抗疲劳制造技术,目前关于激光喷丸强化的研究大多集中在机制和实验上.由于激光冲击过程是一个复杂的热力耦合过程.涉及的因素较多,实验方法难于全面理解各种参数对激光喷丸效果的关联影响.介绍了典型的激光喷丸强化过程的数字化分析方法,以有限元分析工具ABAQUS和MSC.Fatigue为平台,通过编制激光冲击波加载模块,解决了数据流传递中的接口问题.以2024-T3航空铝合金试样为例,对激光喷丸强化过程中激光冲击波的传播、残余应力大小以及疲劳特性行为等进行了数值分析,并对激光喷丸强化的疲劳寿命进行了预测,建立起了激光冲击波压力一残余应力一疲劳寿命之间的数字化分析方法,实现了激光喷丸过程和喷丸效果评价的可视化.

Numerical Analysis on Fatigue Properties of Aluminum Alloy Induced by Laser Shock Peening

Laser shock peening(LSP) is a non-traditional anti-fatigue manufactureing technology based on mechanical effect of laser shock wave.Up to now,research on LSP mostly focuses on mechanism and experiment,whereas experimental method is hard to achieve comprehensive understanding on the correlative influence of various parameters to the effect of LSP.A numerical analysis method on typical LSP process is introduced,FEA code ABAQUS and MSC.Fatigue are used as platforms,laser shock loading module is programmed to solve the interface problem of data transfer.Taking 2024-T3 aluminum alloy samples for example,propagations of laser shock wave,size and distribution of compressive residual stress as well as the fatigue properties are studied by numerical analysis technique,and the fatigue life with LSP is predicted.The relationship between laser shock wave pressure,residual stress and fatigue life is established by digital analysis method.Visualization of LSP process and evaluation of peening effect could be achieved.