Transient laser ablation simulation method of metal materials

Abstract

The invention discloses a transient laser ablation simulation method of a metal material. The method comprises the following steps of carrying out surface ablation simulation of the metal material, including setting the laser parameters, establishing a heat conduction model in the metal material for obtaining a temperature T1 in the metal material so as to calculate thermophysical parameters of the metal material, and establishing a surface ablation model of the metal material for obtaining the surface ablation mass flow rate of the metal material so as to obtain an ablation surface annealingrate and a ablation surface coordinate position; and carrying out sputtering simulation of an ablation product, including establishing a fluid dynamics model of ablation product for obtaining the space distribution and temperature T2 of the ablation product, and establishing a local thermodynamic model of the ablation product for obtaining the ion number density ns of all components in the ablation product so as to obtain a absorption coefficient of the ablation product for the laser energy and then obtain a surface laser energy Is of the metal material. According to the method, the metal material ablation and the ablation product sputtering can be simultaneously simulated, the precision and the efficiency of laser precision machining of the metal material can be effectively improved, andthe application range is wide.

Description

technical field [0001] The invention relates to the technical field of high-precision laser processing metal materials, in particular to a transient laser ablation simulation method for metal materials. Background technique [0002] Laser processing is one of the most advanced processing technologies at present. It has the advantages of wide processing range, precision and detail, high speed, safety and reliability, and low cost. The processing accuracy can reach the micron level. However, for the processing of smaller-sized metal materials, it is necessary to understand the mechanism of interaction between the laser beam and the metal material. [0003] The transient laser ablation process of metal materials involves various physical mechanisms such as heat conduction, thermal evaporation, dielectric transition, phase explosion, etc. The thermophysical properties of the working fluid and laser parameters have a significant impact on the laser ablation process. Therefore, i...

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Problems solved by technology

[0005] The invention provides a transient laser ablation simulation method for metal materials, which is used to overcome the defects in the prior art that can only calculate the laser ablation process with long pulse width and low power, which makes the ablation accuracy of metal materials obtained by simulation limited, etc. , to achieve accurate simulation of metal material surface ablation and sputtering of ablation products, thereby improving the precision and efficiency of laser precision machining of metal materials, thereby reducing processing costs

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