Single-beam double-physical-effect coordinating and distributing method applicable to uniform laser shock and application thereof

A single-beam double-physical-effect coordinating and distributing method applicable to uniform laser shock, comprising:

• S1, determining a residual stress distribution state of a single spot irradiation region under a solid constraint layer condition and defining a proportion of an occurring intensity of a plasma shock effect to a cavitation effect under the solid constraint layer condition as 1:0;
• S2, adopting different liquids as constraint layer conditions, setting a plurality of groups of laser shock processing technologies with different liquid constraint layer conditions to measure the residual stress distribution state of the single spot irradiation region under each group of liquid constraint layer conditions;
• so that a preliminary database of relationships between the laser shock processing technologies under the different liquid constraint layer conditions and the residual stress distribution state of the corresponding single spot irradiation region may be obtained;
• S3, taking the residual stress distribution state of the single spot irradiation region under the solid constraint condition obtained in step S1 as a benchmark, from the preliminary database in step S2, for each group of the liquid constraint conditions performing the following operations:
• determining a liquid constraint layer condition that yields a residual stress distribution state identical to that obtained in step S1 and defining a proportion of an occurring intensity of the plasma shock effect to the cavitation effect under the liquid constraint layer condition also as 1:0;
• S4, on a basis of the liquid constraint layer conditions in step S3, performing laser shock treatment on a surface of a material by varying liquid constraint layer conditions;
• S5, testing the residual stress distribution state of the single spot irradiation region on the surface of the material under the liquid constraint layer conditions of step S4;
• S6, determining a liquid constraint layer condition in each group with an optimal uniform peening effect by comparing the benchmark residual stress distribution state in step S3 with the different residual stress distribution states obtained in step S5, that is, an optimal liquid constraint layer condition makes a residual stress hole phenomenon disappear or be lowest in occurring degree;
• S7, by a controlled variable approach, obtaining a final database of relationships between the different liquid constraint layer conditions and the proportions of the occurring intensity of the plasma shock effect to the cavitation effect as the proportions of the occurring intensity change from 1.0 to 0.5:0.5;
• and
• S8, obtaining a required liquid constraint layer condition in the final database of step S7 when taking laser shock uniform peening in a multiple spot region as a target, and performing the laser shock treatment that conforms to a preset proportion of the occurring intensity of the plasma shock effect to the cavitation effect, wherein,
• each group of the liquid constraint layer conditions in step S2 and step S4 comprises any one of a texture, a viscosity and a thickness;
• and in step S7, the controlled variable approach comprises:
• in a case of controlling other any of two liquid constraint layer feature conditions to be unchanged, obtaining relationships between the varying single liquid constraint layer conditions and the occurring intensity proportions of the plasma shock effect to the cavitation effect.