scholarly journals On the prediction of fatigue crack growth based on weight functions in residual stress fields induced by laser shock peening and laser heating

2021 ◽  
Author(s):  
Nikolai Kashaev ◽  
Sören Keller ◽  
Peter Staron ◽  
Emad Maawad ◽  
Norbert Huber
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Laser Heating ◽  
Laser Shock Peening ◽  
Stress Fields ◽  
Weight Functions ◽  
Laser Shock ◽  
Shock Peening

Fatigue crack growth in residual stress fields of laser shock peened Ti6Al4V titanium alloy

2021 ◽  
pp. 161427
Author(s):  
Hepeng Zhang ◽  
Zhongyi Cai ◽  
Jiaxuan Chi ◽  
Rujian Sun ◽  
Zhigang Che ◽  
...  
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Stress Fields ◽  
Laser Shock ◽  
Ti6al4v Titanium Alloy

Fatigue Life Recovery via Laser Shock Peening in Mechanically Damaged Aluminium Sheet; Experiments and Prediction Models

2014 ◽  
Vol 891-892 ◽  
pp. 980-985 ◽  
Author(s):  
Niall Smyth ◽  
Philip E. Irving
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Prediction Models ◽  
Load Cycle ◽  
Laser Shock Peening ◽  
Stress Fields ◽  
Hole Drilling ◽  
Laser Shock ◽  
Aluminium Sheet ◽  
Shock Peening

This paper reports the effectiveness of residual stress fields induced by laser shock peening (LSP) to recover pristine fatigue life. Scratches 50 and 150 μm deep with 5 μm root radii were introduced into samples of 2024-T351 aluminium sheet 2 mm thick using a diamond tipped tool. LSP was applied along the scratch in a band 5 mm wide. Residual stress fields induced were measured using incremental hole drilling. Compressive residual stress at the surface was-78 MPa increasing to-204 MPa at a depth of 220 μm. Fatigue tests were performed on peened, unpeened, pristine and scribed samples. Scratches reduced fatigue lives by factors up to 22 and LSP restored 74% of pristine life. Unpeened samples fractured at the scratches however peened samples did not fracture at the scratches but instead on the untreated rear face of the samples. Crack initiation still occurred at the root of the scribes on or close to the first load cycle in both peened and unpeened samples. In peened samples the crack at the root of the scribe did not progress to failure, suggesting that residual stress did not affect initiation behaviour but instead FCGR. A residual stress model is presented to predict crack behaviour in peened samples.

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