重复频率脉冲激光与铝合金热作用过程的数值模拟研究

发布时间：2018-04-29 20:01

本文选题：脉冲激光 + 温度场　；参考：《长春理工大学》2015年硕士论文

【摘要】：激光应用的重要基础是激光与物质相互作用物理学,重复频率长脉冲激光对金属材料的作用主要体现在热作用上。铝合金是工业应用上使用范围最广泛的材料之一,所以研究重复频率脉冲激光对铝合金的热作用过程具有重要的应用价值。本文基于传热学基本理论,使用经典傅里叶热传导方程,应用有限元数值计算方法,建立了重复频率脉冲激光作用于铝合金的温升计算模型。使用等效比热容法对相变问题进行了处理,同时考虑了铝合金热物理参数随温度变化的情况,计算了不同脉冲激光的重复频率和能量密度下,铝合金温度场的空间和时间分布,并对铝合金的气化阈值和温度回落过程进行了计算与分析,得到了铝合金温度场的时空分布随脉冲激光的重复频率和能量密度的变化规律。
[Abstract]:The important foundation of laser application is the physics of the interaction between laser and matter. The effect of long pulse laser with repetition rate on metal material is mainly reflected in thermal action. Aluminum alloy is one of the most widely used materials in industrial application. Based on the basic theory of heat transfer, using the classical Fourier heat conduction equation and the finite element numerical calculation method, the temperature rise calculation model of aluminum alloy acting on repeated frequency pulsed laser is established in this paper. The equivalent specific heat capacity method is used to deal with the phase transformation problem. The temperature field spatial and temporal distributions of aluminum alloy under different pulse laser repetition frequency and energy density are calculated by taking into account the variation of thermal physical parameters of aluminum alloy with temperature. The vaporization threshold and temperature drop process of aluminum alloy were calculated and analyzed. The time and space distribution of temperature field of aluminum alloy varied with the repetition rate and energy density of pulsed laser.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN249

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