Peen Forming uses the compressive stresses induced by controlled shot peening to alter the stress pattern, magnitude and depth within a structure to deliberately create a change in the component shape. Gentle curves within the elastic range of the material are regularly formed to consistent tolerances.
Laser peening is an alternative technique for the introduction of residual compressive stresses. It has the advantage over conventional shot peening in that it induces these stresses to greater depths, consequently a tighter radius of curvature can be achieved or performed on thicker materials.
Peen forming is the preferred method of forming aerodynamic contours into aircraft wingskins. It is a dieless forming process that is performed at room temperature and it is best suited for forming curvatures where the radii are within the elastic range of the metal without abrupt changes in contour.
Parts formed by peen forming exhibit increased resistance to flexural bending fatigue and where peen formed pieces are processed on one side only, the result causes both sides to have compressive stress. These compressive stresses serve to inhibit stress corrosion cracking and to improve fatigue resistance.
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