Fatigue life investigation of notched TC4 specimens subjected to different patterns of laser shock peening

IF 1.2 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Frattura ed Integrita Strutturale Pub Date : 2023-06-22 DOI:10.3221/igf-esis.65.08

A. Iziumova, Maxim Zhelnin Maxim Zhelnin, Anastasia Kostina Anastasia Kostina, Aleksei Vshivkov Aleksei Vshivkov, Elena Gachegova Elena Gachegova, Oleg Plekhov Oleg Plekhov, S. Swaroop

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Abstract

The exhaustion of constructive ways for increasing the service life of parts has led to the development of new methods which can improve their material properties during operation under various loading conditions. Laser shock peening (LSP) induces compressive residual stress field which prevents fatigue crack initiation and propagation in components. Characteristics of laser impact and treatment patterns play an important role in efficiency of LSP application for improvement of fatigue properties. This work is devoted to the experimental examination of two LSP patterns to reveal the most optimal scheme from fatigue live improvement point of view. Proposed LSP pattern allowed one to increase the fatigue life of specimens with semi-circular notch by an order of magnitude. The numerical simulation of the LSP was performed to visualize the residual stress field of treated specimen after loading and to give the interpretation of the experimentally observed improvement of fatigue life.

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不同激光冲击喷丸方式下缺口TC4试样的疲劳寿命研究

为了提高零件的使用寿命，已经用尽了各种建设性的方法，这导致了新方法的发展，这些方法可以在各种载荷条件下提高零件的材料性能。激光冲击喷丸（LSP）产生压缩残余应力场，防止疲劳裂纹在构件中萌生和扩展。激光冲击和处理模式的特性对LSP应用于改善疲劳性能的效率起着重要作用。这项工作致力于对两种LSP模式进行实验检验，以从疲劳寿命改善的角度揭示最佳方案。所提出的LSP模式使具有半圆形缺口的试样的疲劳寿命增加了一个数量级。对LSP进行了数值模拟，以可视化加载后处理试样的残余应力场，并对实验观察到的疲劳寿命改善进行了解释。

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