Effect of laser shock peening on fatigue life and surface characteristics of stainless steel cortical bone screws

2004 ◽  
Vol 65 (7) ◽  
pp. 972-976 ◽  
Author(s):  
Christopher B. O'Sullivan ◽  
Alicia L. Bertone ◽  
Alan S. Litsky ◽  
James T. Robertson
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Cortical Bone ◽  
Surface Characteristics ◽  
Bone Screws ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

scholarly journals Increase of the Fatigue Life of Stainless Steel by Laser Shock Peening

2019 ◽  
pp. 0826-0831
Author(s):  
Zbynek Spirit ◽  
Jan Kaufman ◽  
Josef Strejcius ◽  
Michal Chocolousek ◽  
Josef Kott
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

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.

Effects of Laser Shock Peening and Ultrasonic Shot Peening on Fatigue Property of 1Cr11Ni2W2MoV Stainless Steel

2013 ◽  
Vol 50 (5) ◽  
pp. 051403 ◽  
Author(s):  
赖志林 Lai Zhilin ◽  
汪诚 Wang Cheng ◽  
李应红 Li Yinghong ◽  
周留成 Zhou Liucheng ◽  
何卫锋 He Weifeng ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Shot Peening ◽  
Fatigue Property ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Ultrasonic Shot Peening ◽  
Shock Peening

scholarly journals The Influence of Laser Shock Peening on Fatigue Properties of AA2024-T3 Alloy with a Fastener Hole

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 495
Author(s):  
Ruslan Sikhamov ◽  
Fedor Fomin ◽  
Benjamin Klusemann ◽  
Nikolai Kashaev
Keyword(s):  
Fatigue Life ◽  
Fatigue Cracks ◽  
Initial Crack ◽  
Fatigue Tests ◽  
Laser Shock Peening ◽  
Fatigue Properties ◽  
Hole Drilling ◽  
Laser Shock ◽  
Fastener Hole ◽  
Shock Peening

The objective of the present study was to estimate the influence of laser shock peening on the fatigue properties of AA2024-T3 specimens with a fastener hole and to investigate the possibility to heal the initial cracks in such specimens. Fatigue cracks of different lengths were introduced in the specimens with a fastener hole before applying laser shock peening. Deep compressive residual stresses, characterized by the hole drilling method, were generated into the specimens by applying laser shock peening on both sides. Subsequently, the specimens were subjected to fatigue tests. The results show that laser shock peening has a positive effect regarding the fatigue life improvement in the specimens with a fastener hole. In addition, laser shock peening leads to a healing effect on fatigue cracks. The efficiency of this effect depends on the initial crack length. The effect of laser shock peening on the fatigue life periods was determined by using resonant frequency graphs.

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