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激光破岩过程中激光与岩石相互作用的过程涉及到复杂的三维非稳定传热学问题,利用能量守恒原理,得到了激光破岩的传热方程;基于热应力理论和广义胡克定律,得到激光破岩的应力分布求解公式。通过建立激光破岩的三维有限元模型,对光斑直径为0.2 mm的5种不同功率的高斯激光源与砂岩的相互作用过程进行了直接耦合数值仿真分析。研究发现,在设定条件下,对于强度较大的岩石,激光破岩过程中起主要作用的是激光的气化作用;而对于强度较小的岩石,起主要作用的是热应力引起的破碎。
The process of laser-rock interaction during laser rock-breaking involves complex three-dimensional heat transfer problem. Using the principle of energy conservation, the heat transfer equation of laser rock breaking is obtained. Based on the theory of thermal stress and generalized Hooke’s law, Solution Formula of Stress Distribution of Laser Breaking Rock. Through the establishment of the 3D finite element model of laser rock breaking, the direct coupling numerical simulation of 5 different power Gaussian laser sources with sandstone with a diameter of 0.2 mm was carried out. It is found that under the set conditions, for the rocks with higher intensity, the laser gasification plays a major role in the laser rock breaking, while for the less intense rock, the main effect is the thermal stress-induced crushing .