Abstract: [Objective] The purpose of this paper is to investigate formation mechanism of tensioning stress of circular saw blade after laser shock process.[Method] Mechanical model for laser shock tensioning process of circular saw blade was reasonably simplified and built by ABAQUS finite element software. Tensioning stress field of circular saw blade after laser shock process was tested by static strain acquisition instrument.[Result] With the increase of shock wave peak pressure,the tangential tensile stress in the edge of circular saw blade is increased when laser pulse width is less than 20 ns, whereas increased first and then decreased when laser pulse width is greater than or equal to 20 ns. When shock wave peak pressure is about 6 GPa, the tangential tensile stress in the edge of circular saw blade reaches the maximum.[Conclusion] Tangential tensile stress is produced in the edge of circular saw blade after laser shock process with tensioning effect. Laser pulse width and shock wave peak pressure have different effects on tangential tensile stress in the edge of circular saw blade. The optimal shock wave pressure exists, which allows maximum tangential tensile stress in the edge of circular saw blade to be reached. The theoretical and experimental result were in good agreement. The laser shock tensioning process of circular saw blade is feasible. The adjustment of laser parameters can adjust the tensioning effect of circular saw blade.

Key words: laser shock, circular saw blade, tensioning, stress, finite element method