Laser Peening Fact Sheet

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Hepburn and Sons LLC “Trusted advisors to the American Maritime Industry” TECHNOLOGY FACT SHEET – Laser Shock Peening TECHNICAL CHALLENGE 10X Compressive residual stress • Aluminum shipbuilding on the rise in the Navy, leading to benefits over other peening materials problems like stress corrosion cracking (SCC) and methods and treatments sensitization • Repair yards tasked with these substantial repairs • Aluminum repair has significant rework, as it is difficult to work with • Welding repairs impart large stresses on and deform the 48X aluminum SCC on aluminum ship Lifetime extension of • Flame straightening not permitted on marine grade aluminum superstructure sensitized aluminum when laser shock peened versus • Common aluminum forming methods are laborious, costly, and no treatment time-consuming TECHNOLOGY OVERVIEW • High-energy pulsed laser directed at material surface to generate pressure pulses • Shock wave plastically yields and cold works the 1-5 mm material to generate deep compressive stresses Range of compressive residual stress depth as a • Residual stress layers are orders of magnitude result of laser shock peening deeper than that achievable with shot peening • Highly predictive and deterministic stress Laser peening a metal surface profiles • Used successfully in the aerospace industry for nearly 20 years • Significantly improves aluminum lifespan • 20 years Arrests crack growth and mitigates stress Length of time that laser corrosion cracking shock peening has been successfully used in the • Mitigates aluminum sensitization and shapes aerospace industry to complex geometries with minimum heat improve the fatigue life of aircraft parts 48X lifespan improvement with laser peening BENEFIT TO THE WARFIGHTER • Reduces costs of labor, upfront construction, and repair • Avoids introduction of heat (welding), which prevents 9 weakening of the aluminum ships Technology Readiness Level (TRL) of laser shock peening • Significantly improves fatigue life of aluminum ships, in the aerospace industry which reduces the frequency of repair/replacement • Long lasting repairs to Navy ships U.S. Navy Cruiser 9200 Church Street, Manassas Virginia 20110 | www.hepburnandsons.com | (703) 366- 3434 | [email protected] .

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Controlled Shot Peening Preventing Failures
MIC Services INNOVATORS IN TECHNOLOGY Metal Improvement Company Subsidiary of Curtiss-Wright Corporation Controlled shot peening Preventing failures Enhancing the performance of metals and materials www.metalimprovement.co.uk Controlled shot peening - preventing failures Metal Improvement Company (MIC) is a Component failure is often related to residual tensile stress global organisation specialising in metal and DESIGN CONSIDERATIONS - COST OF PERFORMANCE CRITERIA material surface treatments which enhance induced during manufacture. Subsequent severe working performance and extend the life of critical and/or unexpected conditions can eventually lead to Parameter selection - the choice of process have to be accurately and Intensity control components, enabling component designs to shot peening parameters is dependant repeatedly controlled. achieve their maximum potential. premature failure. on a variety of conditions: Shot peening intensity is the measure Controlled shot peening is different of the energy of the shot stream. It is Established in 1945, MIC has over 60 l knowledge of the application of the from most manufacturing processes in one of the essential means of ensuring operating divisions in Europe, USA, Canada Typical examples of premature failure are: The shot peening process - how it component that there is no non-destructive method process repeatability. The energy of the and Asia with on-site processing worldwide. works l component geometry to confirm that it has been performed shot stream is directly related to the We offer a quality controlled and cost l Metal fatigue to the proper specification. Techniques compressive stress that is imparted into l manufacturing method effective service, working in partnership to Controlled shot peening is the such as x-ray diffraction require the a component.
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Characterization of Laser Peening- Induced Effects on a Biomedical Ti6al4v Alloy by Thermoelectric Means
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Peening Weld Surfaces with Steel Shot Induces Compressive Stresses That Raise Resistance to Fatigue and Corrosion
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Shot Peening Overview
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Effective Simulation and Optimization of a Laser Peening Process BE ACCEPTED in PARTIAL FULFILLMENT of the REQUIREMENTS for the DEGREE of Doctor of Philosophy
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