A low stress way of adding compressive stress

摘要

Compressive stress can improve the impact resistance and fatigue life of metallic components. In airplane wings and other structures, techniques such as shot peening and laser shocking are used, but drawbacks include high cost, cold working time, and component damage. Low Plasticity Burnishing (LPB), from NASA Glenn Research Center, Cleveland, Ohio, and Lambda Technologies, Cincinnati, Ohio, offers residual stress orders of magnitude deeper than shot peening with minimal plastic deformation. LPB produces a layer of compressive stress of high magnitude and depth, with minimal plastic deformation or cold work.