Numerical Analysis of Compressive Residual Stresses due to Shot Peening

Faculty Mentor

Dr. Heechang (Alex) Bae


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Oral Presentation

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Shot peening is a cold working process used in aerospace manufacturing to change mechanical properties of metals. This process causes plastic deformation in the material which then creates compressive residual stress and surface hardness. An increased surface hardness and compressive residual stress prevents the propagation of micro-cracks, protecting the material from a catastrophic fatigue failure. Plastic deformation is achieved by a high speed impact between the surface of the material to be modified and a sphere called a ‘shot’. Because the shot is harder than the material, it will not have any plastic deformation after impact with the material surface, allowing the material to build an even greater residual compressive stress. This research will be looking at the results of single and multiple shot impacts on flat surfaces using finite element analysis (FEA). FEA is used to optimize the parameters and results of shot peening, such as shot speed and surface roughness, without running real life experiments which can be tedious, expensive, and difficult. The software used in this research is LS-DYNA, a program proficient in impact analysis. The depth of plastic deformation and residual stress values due to different impact scenarios will be examined.

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