纳秒激光去除漆层传热模型及其机理研究

于松洁; 崔高伟; 许光映

doi:10.21656/1000-0887.440344

纳秒激光去除漆层传热模型及其机理研究

doi: 10.21656/1000-0887.440344

浙江海洋大学船舶与海运学院，浙江舟山 316022

基金项目:

舟山市科技基金 2017C41002

舟山市科技基金 2016C41009

详细信息

作者简介:
于松洁(1998—)，女，硕士(E-mail: 19818064618@139.com)

通讯作者:
许光映(1967—)，男，副教授, 硕士生导师(通讯作者. E-mail: xugy@zjou.edu.cn)

中图分类号: O13
计量
- 文章访问数: 50
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- PDF下载量: 7
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-04
- 修回日期: 2024-07-11
- 刊出日期: 2024-12-01

Study on Heat Transfer Models and Mechanisms for Nanosecond Laser Removal of Paint Layers

School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, P.R.China

摘要

摘要: 考虑激光在漆层和基层的吸收和扩散特性，建立漆层和金属基层传热模型Ⅰ和热衔接边界条件.作为对比，相应建立传热模型Ⅱ和Ⅲ，它们均忽略漆层和基层交界面处的热衔接条件，其中模型Ⅲ基层中漆层和基层均采用体热源.利用Laplace变换求出问题的半解析解.利用Laplace数值反变换，给出相应的数值解算例，得出了以下结论：模型Ⅰ得到连续的温度分布，而模型Ⅱ和模型Ⅲ得到间断的温度分布，这是违背物理实际的.其次，基于模型Ⅰ预测清洗除漆层的时间和能量密度处于对比模型Ⅱ和Ⅲ之间，所得结论可为激光清洗工艺的优化改进提供理论支撑.
- 清洗模型 /
- 衔接条件 /
- 损伤阈值 /
- 热应力
Abstract: In view of the absorption and diffusion characteristics of laser in the paint layer and the base layer, heat transfer model Ⅰ and thermal connection boundary conditions for the paint layer and the metal base layer was established. As a comparison, corresponding heat transfer models Ⅱ and Ⅲ were established, with the thermal connection conditions at the interface between the paint layer and the base layer ignored. In model Ⅲ, both the paint layer and the base layer were connected to the bulk heat source. A semi-analytical solution to the problem was obtained through the Laplacian transformation. Corresponding numerical solution examples were given through the Laplacian numerical inverse transformation. The results show that, model Ⅰ gives continuous temperature distributions, while model Ⅱ and model Ⅲ give discontinuous temperature distributions, which goes against physical reality. Secondly, based on model Ⅰ, the predicted time and energy density for cleaning and removing the paint layer are between those of model Ⅱ and model Ⅲ. The work provides a theoretical reference for improving the laser cleaning process.
- cleaning model /
- thermal connection condition /
- damage threshold /
- thermal stress

HTML全文

图 1 一维物理模型

Figure 1. The 1D physical model

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图 2 交界面处能量守恒

Figure 2. Energy conservation at the interface

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图 3 不同时刻不同模型温升随位置的变化

Figure 3. Temperature variations of different models with positions for different moments

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图 4 脉冲结束时，铁基层交界面处各模型温度随激光通量的变化

Figure 4. The different models' temperature variations with laser fluences on the iron substrates at the end of a single laser pulse

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图 5 脉冲结束时，模型Ⅰ、Ⅱ中铁、铝基层上油漆温升模型随激光通量的变化

Figure 5. Temperature rises of model Ⅰ, Ⅱ with laser fluences on the iron, aluminum substrates at the end of a single laser pulse

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图 6 热应力随激光通量的变化

Figure 6. Variations of thermal stresses with the laser fluence

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图 7 热应力与黏附力之比随脉冲时间的变化

Figure 7. Variations of the ratio of thermal stresss to adhesion with the pulse time

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表 1 激光参数^[19]

Table 1. Laser parameters^[19]

parameter	paint	Fe substrate	Al substrate
thermal diffusion length L_t/m	9.5×10^-9	1.48×10^-7	2.9×10^-7
absorption depth L_a/m	5.3×10^-5	1.9×10^-8	1.0×10^-8

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表 2 油漆和基层的物理参数^[13]

Table 2. Physical parameters of base and paint^[13]

parameter	paint	Fe base	Al base
thermal conductivity k/(W/(m·K))	0.3	78.48	205.8
thickness l/μm	63	-	-
density ρ/(kg/m³)	1 300	7 870	2 696
specific heat capacity c/(J/(kg·K))	2 510	452	879
thermal diffusivity α	9.19×10^-8	2.206×10^-5	8.684×10^-5
linear expansion coefficient γ/K^-1	1.0×10^-6	1.23×10^-5	2.38×10^-5
absorption rate a	0.611	0.363	0.642
reflectivity R	0.202	0.637	0.358
transmittance τ	0.187	0	0
absorption coefficient δ/m^-1	1.88×10⁴	5.24×10⁷	1.0×10⁸
elasticity modulus Y/(N/m²)	1.0×10¹⁰	1.9×10¹¹	7.0×10¹⁰
approximate adhesion value f/(N/m²)	4.2×10⁷~5×10⁷	-	-

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