Temperatures, pressures and stresses during laser shock processing |
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Authors: | Thord Thorslund Franz-Josef Kahlen Aravinda Kar |
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Institution: | Laser-Aided Manufacturing, Materials and Microprocessing (LAMMMP) Laboratory, School of Optics and Center for Research and Education in Optics and Lasers (CREOL), Mechanical, Materials, and Aerospace Engineering Department, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816-2700, USA |
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Abstract: | Mathematical models are developed to calculate the temperatures, pressures and stresses during laser shock processing for time-modulated (ramp-up, ramp-down and rectangular) laser pulses. Three different shock processing configurations are also considered: non-ablative exposure, ablative exposure and confined ablation with coating. The results for iron show that the plasma pressure reaches an average value of 9 GPa in direct ablation configuration and plays a dominant role for all three types of laser pulses. In the case of confined geometry, the plasma pressure reaches an average value of 20 GPa. All calculated pressures and stresses exceed the yield strength of the workpiece, indicating plastic deformation. It is also shown that pulses with short rise times yield higher plasma pressures. |
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Keywords: | Shock processing Temperatures Pressures Stresses Non-ablative Ablative Confined ablative |
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