Structural Technology Evaluation Analysis Program (STEAP). Delivery Order 0025: Laser Peening for Reliable Fatigue Life

2010 ◽  
Author(s):  
Hemanth Amarchinta ◽  
Ramana V. Grandhi
Keyword(s):  
Fatigue Life ◽  
Laser Peening ◽  
Technology Evaluation ◽  
Analysis Program

Effects of Cryogenic Laser Peening on Damping Characteristics and Vibration Fatigue Life of TC6 Titanium Alloy

2020 ◽  
Vol 47 (4) ◽  
pp. 0402011
Author(s):  
黄宇 Huang Yu ◽  
周建忠 Zhou Jianzhong ◽  
李京 Li Jing ◽  
田绪亮 Tian Xuliang ◽  
孟宪凯 Meng Xiankai ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Life ◽  
Laser Peening ◽  
Damping Characteristics ◽  
Vibration Fatigue

306 Rolling fatigue life of carburized steel treated by laser peening

2016 ◽  
Vol 2016.54 (0) ◽  
pp. _306-1_-_306-3_
Author(s):  
Masahiro FUJII ◽  
Shinichiro ABE ◽  
Yuji KOBAYASHI ◽  
Toshiya TSUJI ◽  
Bovid STAN
Keyword(s):  
Fatigue Life ◽  
Laser Peening ◽  
Carburized Steel

Transportable Laser Peening System for Field Applications to Improve Fatigue and SCC Resistance of Offshore Components and Structures

2006 ◽  
Author(s):  
Lloyd A. Hackel ◽  
C. Brent Dane ◽  
Fritz Harris ◽  
Jon Rankin ◽  
Chanh Truong
Keyword(s):  
Fatigue Life ◽  
Stress Corrosion Cracking ◽  
Life Extension ◽  
Laser Peening ◽  
Large Structures ◽  
Aerospace Alloys ◽  
Titanium Aluminum ◽  
Medium Strength ◽  
Exploration And Production ◽  
Improve Fatigue

Laser peening technology has matured into a fully qualified production process that is now in routine and reliable use for a range of aerospace alloys. The technology is capable of extending the fatigue life and stress corrosion cracking life of components, and will enable designers to consider higher stress levels in life limited designs. Applications under development for steels include high and medium strength steels used in off shore oil exploration and production, titanium, aluminum and even ceramics and plastics as well as life extension of steel and aluminum welds. Fixed systems to treat components and transportable systems capable of field operations are available with a moveable beam that allows peening directly as needed on large structures.

scholarly journals Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

2021 ◽  
Vol 2 (4) ◽  
pp. 878-890
Author(s):  
Tomoharu Kato ◽  
Yoshihiro Sakino ◽  
Yuji Sano
Keyword(s):  
Fatigue Life ◽  
Residual Stresses ◽  
High Strength Steel ◽  
Welded Joint ◽  
Base Material ◽  
High Strength ◽  
Microchip Laser ◽  
Laser Peening ◽  
Near Surface ◽  
Compressive Residual Stresses

Laser peening introduces compressive residual stresses on the surfaces of various materials and is effective in enhancing fatigue strength. Using a small microchip laser, with energies of 5, 10, and 15 mJ, the authors applied laser peening to the base material of an HT780 high-strength steel, and confirmed compressive residual stresses in the near-surface layer. Laser peening with a pulse energy of 15 mJ was then applied to fatigue samples of an HT780 butt-welded joint. It was confirmed that laser peening with the microchip laser prolonged the fatigue life of the welded joint samples to the same level as in previous studies with a conventional laser.

Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress

2019 ◽  
Vol 42 (5) ◽  
pp. 1161-1174 ◽  
Author(s):  
Niall A. Smyth ◽  
M. Burak Toparli ◽  
Michael E. Fitzpatrick ◽  
Phil E. Irving
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Laser Peening ◽  
Aluminium Sheet

Comparison Research on Mechanical Properties of Stainless Steel after Laser Peened and Ultrasonically Peened

2013 ◽  
Vol 690-693 ◽  
pp. 2107-2111
Author(s):  
Cheng Wang ◽  
Zhi Lin Lai ◽  
Dong Sun ◽  
Liu Cheng Zhou ◽  
Zhi Bin An
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Fatigue Life ◽  
Fatigue Tests ◽  
Laser Peening ◽  
Comparison Research ◽  
Vibration Fatigue ◽  
Ultrasonic Shot Peening ◽  
Processing Techniques ◽  
Compressive Residual Stresses

The mechanical properties of 1Cr11Ni2W2MoV stainless steel after laser peening (LP) and ultrasonic shot peening (USP) were examined and compared. The stainless steel specimens were treated with the two different surface processing techniques. X-ray diffractometry (XRD), scanning electron microscope (SEM), microhardness tester were used to investigate microstructure and mechanical properties. Vibration fatigue tests of untreated, LPed and USPed samples were also conducted. The results indicated that LP treatment can improved the fatigue life of 1Cr11Ni2W2MoV stainless steel more effectively. The increases of the compressive residual stress depth and microhardness in surface layer after LP were greater than that of USP. The SEM studies showed that USP treatment had an advantage in microstructure refinement. The compressive residual stresses make great contributions to the superiority of LP in the improvement of fatigue life of 1Cr11Ni2W2MoV stainless steel to USP.

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