Surface response of copper treated by laser shock processing with microscale

To investigate the influence of shock wave in laser shock processing with microscale on shocked surface, experimental research of copper with different energy and shock number was carried out in the paper, and surface topography was measured. The results show that plastic deformation induced by shock wave with microscale is the interactive effect of pressure in both axial and radial direction. Pressure in axial direction plays a dominant role nearby the centre of laser beam, the amount of the plasticity deformation increases with increament of laser energy and shock number; Pressure in radial direction plays a leading role nearby the periphery, region of plastic deformation in radial direction increases with increament of laser energy, and spot edge is significantly salient when laser energy is over 70 mJ; Plastic deformation in radial direction increases first and then decreases with increasement of shock number, bulging deformation at spot edge is serious when shock number is over 3 times.