Effects of Shot Peening Cyclic Load on Fatigue Crack Propagation Life of 2024T351 Aluminum Alloy
DOI:
https://doi.org/10.58916/jhas.v9i5.561الكلمات المفتاحية:
Shot peen، Cyclic load، Fatigue life، intensity، Residual stressالملخص
Surface treatments like shot peening are frequently employed to bolster the fatigue resistance of components. This study entails simulation and experimental investigations conducted on 2024-T351 aluminum alloy specimens subjected to three distinct shot peening treatments. The experiments involved subjecting specimens to varying intensities shot peening categorized as 4-6A, 6-8A, and 8-10A, followed by cyclic loading tests. Two different stress levels, 170MPa and 280MPa, were applied during cyclic tests for varying cycle counts ranging from 1 to 10,000 cycles. The enhanced fatigue life of peened specimens exhibited a notable increase of 28%, contingent upon the shot peening parameters. Specifically, employing higher shot peening parameters such as material of shot peen, peening velocity, and size led to greater layer of residual stresses, thereby improving fatigue life. These beneficial effects serve to impede crack initiation and propagation on component surfaces, consequently retarding crack propagation rates. Fatigue life estimation for the 2024-T351 aluminum alloy can be derived from the S-N curve based on the maximum stress experienced by the specimen. Notably, simulation results closely aligned with experimental findings.
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