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Laser peening (LP), or laser shock peening (LSP), is a surface engineering process used to impart beneficial residual stresses in materials. The deep, high-magnitude compressive residual stresses induced by laser peening increase the resistance of materials to surface-related failures, such as fatigue, fretting fatigue, and stress corrosion cracking.
The company founder, Jeff Dulaney, earned his Ph.D. in Physics at the University of Pittsburgh in 1986, then worked at Battelle Columbus Laboratory from 1987 to 1994 as a physicist in the laser department. He helped design and build the first industrial laser shock peening system for Wagner Laser Technologies in the early 1990s. [2] Dr.
In metallurgy, peening is the process of working a metal's surface to improve its material properties, usually by mechanical means, such as hammer blows, by blasting with shot (shot peening), focusing light (laser peening), or in recent years, with water column impacts (water jet peening) and cavitation jets (cavitation peening). [1]
Residual stress may be desirable or undesirable. For example, laser peening imparts deep beneficial compressive residual stresses into metal components such as turbine engine fan blades, and it is used in toughened glass to allow for large, thin, crack- and scratch-resistant glass displays on smartphones.
Laser peening imparts deep compressive residual stresses on the order of 10 to 20 times deeper than conventional shot peening, making them significantly more beneficial at preventing SCC. [5] Laser peening is widely used in the aerospace and power generation industries in gas fired turbine engines. [6]
Laser shock peening, a surface engineering process used to impart beneficial residual stresses in materials Lightest Supersymmetric Particle , generic name given to the lightest of the additional hypothetical particles found in supersymmetric models
Increases in fatigue life and strength are proportionally related to the depth of the compressive residual stresses imparted. Shot peening imparts compressive residual stresses approximately 0.005 inches (0.1 mm) deep, while laser peening can go 0.040 to 0.100 inches (1 to 2.5 mm) deep, or deeper. [50] [failed verification] Deep cryogenic ...
This technique is part of the High Frequency Mechanical Impact (HFMI) processes. Other acronyms are also equivalent: Ultrasonic Needle Peening (UNP), Ultrasonic Peening (UP). Ultrasonic impact treatment can result in controlled residual compressive stress, grain refinement and grain size reduction.