基于L-S广义热弹性理论YSZ在超短脉冲下的热力响应  

Thermomechanical Responses of YSZ Under Ultrashort Thermal Shock Based on the L-S Generalized Thermoelastic Theory

作　　者：赵颐 田晓耕[1] ZHAO Yi;TIAN Xiaogeng(State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi'an Jiaotong University,Xi’an 710000,P.R.China)

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室,西安710000

出　　处：《应用数学和力学》2023年第7期784-796,共13页Applied Mathematics and Mechanics

基　　金：国家自然科学基金项目(11732007)。

摘　　要：基于L-S广义热弹性理论,考虑材料比热容随温度变化,建立了含有内热源的热弹耦合系统控制方程.利用有限元方法研究了氧化钇四方氧化锆(YSZ)在超短脉冲激光作用下的热力响应,获得了材料比热容随温度变化、激光的脉冲宽度等对热力响应的影响,以及机械波在材料中的反射.研究发现,多次脉冲作用下,材料的应力、位移曲线均出现波动,力学响应对加热更加敏感,比热容随温度变化会导致热力响应降低,该研究对提高超短脉冲激光加工质量具有重要的指导作用.Based on the L-S generalized thermoelastic theory and in view of the specific heat capacity change of material with temperature,the control equations for the thermoelastic coupling system with internal heating source were established.The thermomechanical responses of yttrium tetragonal zirconia(YSZ) under the action of ultrashort pulse laser were studied by means of the finite element method.The effects of the specific heat capacity change with temperature,and the pulse width of the laser on the thermomechanical responses and the mechanical wave reflections in material were obtained.The results show that,under repeated pulse laser actions,the stress and displacement of the material will undergo fluctuations,and the mechanical response will be more sensitive to heating than the thermal response.The specific heat capacity change with temperature will result in the decrease of the thermal response.The study provides an important guidance for improving the ultrashort pulse laser machining quality.

关 键 词：超短脉冲激光 广义热弹性 有限元 热力耦合 

分 类 号：O34[理学—固体力学]