基于L-S广义热弹性理论YSZ在超短脉冲下的热力响应

赵颐; 田晓耕

doi:10.21656/1000-0887.430134

基于L-S广义热弹性理论YSZ在超短脉冲下的热力响应

doi: 10.21656/1000-0887.430134

赵颐,
田晓耕^,

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

基金项目:

国家自然科学基金项目 11732007

详细信息

作者简介:
赵颐(1999—)，男，硕士生(E-mail: gssdzhaoyi@foxmail.com)

通讯作者:
田晓耕(1967—)，男，教授，博士，博士生导师(通讯作者. E-mail: tiansu@mail.xjtu.edu.cn)

中图分类号: O34
计量
- 文章访问数: 492
- HTML全文浏览量: 149
- PDF下载量: 73
- 被引次数: 0
出版历程
- 收稿日期: 2022-04-14
- 修回日期: 2022-07-06
- 刊出日期: 2023-07-01

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

ZHAO Yi,
TIAN Xiaogeng^,

State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710000, P.R.China

摘要

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.
- 超短脉冲激光 /
- 广义热弹性 /
- 有限元 /
- 热力耦合
Abstract: 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.
- ultrashort pulse laser /
- generalized thermoelasticity /
- finite element /
- thermomechanical coupling

HTML全文

图 1 轮廓迂回法打孔示意图

Figure 1. Schematic diagram of contour roundabout punching

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图 2 杆的温度分布

Figure 2. Temperature distributions of the rod

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图 3 t=1时杆的应力σ_xx分布

Figure 3. Stress σ_xx distributions of the bar at t=1

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图 4 激光脉冲随时间的变化

Figure 4. The variations of laser pulses with time

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图 5 脉宽为2时的热力响应

Figure 5. Thermal-mechanical responses with a pulse width of 2

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图 6 脉宽为4时的热力响应

Figure 6. Thermal-mechanical responses with a pulse width of 4

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图 7 不同参数下的热力响应

Figure 7. Thermal-mechanical responses under different parameters

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图 8 比热容是否变化对热力响应的影响

Figure 8. Effects of the specific heat capacity change on the thermal-mechanical response

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图 9 应力σ_rr随时间的变化

Figure 9. Variations of stress σ_rr with time

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图 10 应力σ_θθ随时间的变化

Figure 10. Variations of stress σ_θθ with time

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图 11 z=10处的应力分布

Figure 11. Stress distributions at z=10

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