Laser Peening Analysis of Aluminum 5083: A Finite Element Study
Laser Peening Analysis of Aluminum 5083: A Finite Element Study
复制标题
DOI：
10.3390/qubs5040034
复制
发表时间：
2021-12
影响因子：
1.4
通讯作者：
A. Tajyar;Noah Holtham;N. Brooks;L. Hackel;Vincent R. Sherman;Alireza Beheshti;K. Davami
中科院分区：
文献类型：
--
作者：
A. Tajyar;Noah Holtham;N. Brooks;L. Hackel;Vincent R. Sherman;Alireza Beheshti;K. Davami
在这项研究中，有限元（FE）技术被用来预测在不同的功率密度激光喷丸铝5083的残余应力。在显式模型中使用动态压力剖面来创建压力波，并且一旦解稳定，就提取应力结果。结果表明，随着功率密度从0.5增加到4 GW/cm 2，诱导的残余应力单调发展更深，从0.42至1.40 mm。然而，随着功率密度的增加，最大幅度的次表面应力的增加只有到一定的阈值（1 GW/cm 2的铝5083）。在此阈值以上，在峰值压力超过2.5 Hugoniot弹性极限（HEL）时发生的弹性波和塑性波的复杂相互作用导致表面应力降低。有限元结果得到了物理实验和观察的证实。
In this research, a finite element (FE) technique was used to predict the residual stresses in laser-peened aluminum 5083 at different power densities. A dynamic pressure profile was used to create the pressure wave in an explicit model, and the stress results were extracted once the solution was stabilized. It is shown that as power density increases from 0.5 to 4 GW/cm2, the induced residual stresses develop monotonically deeper from 0.42 to 1.40 mm. However, with an increase in the power density, the maximum magnitude of the sub-surface stresses increases only up to a certain threshold (1 GW/cm2 for aluminum 5083). Above this threshold, a complex interaction of the elastic and plastic waves occurring at peak pressures above ≈2.5 Hugoniot Elastic Limit (HEL) results in decreased surface stresses. The FE results are corroborated with physical experiments and observations.