Shot peening for fatigue life improvement and forming of aerospace structures

Shot peening is a cold working process widely used to improve the fatigue life of

metal components in the aerospace industry and to produce thin components with complex shapes such

as wing skins. This process is accomplished by bombarding the surface of a metallic component with

shots at a high velocity that induce a layer of plastic deformation near the surface. This plastic

deformation leads to a residual compressive stress field in the peened surface that reduces the

likelihood of premature failure under cyclic loading conditions and therefore improves the fatigue life of

the peened component. Peen forming is a special application of shot peening, during which, the

combination plastic deformation and compressive stress generation causes the material to develop a

compound, convex curvature on the peened side. Shot peen forming is often more effective in

developing curvatures than rolling, stretching or twisting of metal. Because it is a dieless process, shot

peen forming reduces material allowance from trimming and…..TOBECONTINUED

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Faculty Supervisor:

Myriam Brochu;Philippe Bocher

Student:

Partner:

Pratt & Whitney;Bell Helicopter Textron Canada (Inactive);Dorval Technologies;Héroux Devtek Inc;L-3 MAS;Consortium de recherche et d'innovation en aérospatiale au Québec

Discipline:

Engineering

Sector:

Manufacturing

University:

École de technologie supérieure; École Polytechnique de Montréal; McGill University

Program:

Accelerate

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