Mr. Boshi Yuan Profile

Boshi Yuan

at Changchun Univ of Science and Technology

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Publications (7)

Proceedings Article | 24 November 2021 Paper

Simulation study on the cleaning threshold of continuous laser removal of various coated aluminum alloy substrates

Xudong Sun, Guangyong Jin, Jixing Cai, Boshi Yuan

Proceedings Volume 12060, 120600Y (2021) https://doi.org/10.1117/12.2606515

KEYWORDS: Laser damage threshold, Optical simulations, Laser applications, Aluminum, Temperature metrology, Laser processing, Laser irradiation, Finite element methods

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Proceedings Article | 19 October 2016 Paper

Delay time dependence of thermal effect of combined pulse laser machining

Boshi Yuan, Guangyong Jin, Yao Ma, Wei Zhang

Proceedings Volume 10153, 1015301 (2016) https://doi.org/10.1117/12.2243746

KEYWORDS: Thermal effects, Pulsed laser operation

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Proceedings Article | 19 October 2016 Paper

Simulation study on thermal effect of long pulse laser interaction with CFRP material

Yao Ma, Guangyong Jin, Boshi Yuan

Proceedings Volume 10153, 101530B (2016) https://doi.org/10.1117/12.2244292

KEYWORDS: Thermal effects, Pulsed laser operation, Optical simulations, Carbon, Fiber lasers, Composites

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Laser machining is one of most widely used technologies nowadays and becoming a hot industry as well. At the same time, many kinds of carbon fiber material have been used in different area, such as sports products, transportation, microelectronic industry and so on. Moreover, there is lack of the combination research on the laser interaction with Carbon Fiber Reinforced Polymer (CFRP) material with simulation method. In this paper, the temperature status of long pulse laser interaction with CFRP will be simulated and discussed. Firstly, a laser thermal damage model has been built considering the heat conduction theory and thermal-elasto-plastic theory. Then using COMSOL Multiphysics software to build the geometric model and to simulate the mathematic results. Secondly, the functions of long pulse laser interaction with CFRP has been introduced. Material surface temperature increased by time during the laser irradiating time and the increasing speed is faster when the laser fluence is higher. Furthermore, the peak temperature of the center of material surface is increasing by enhanced the laser fluence when the pulse length is a constant value. In this condition, both the ablation depth and the Heat Affected Zone(HAZ) is larger when increased laser fluence. When keep the laser fluence as a constant value, the laser with shorter pulse length is more easier to make the CFRP to the vaporization material. Meanwhile, the HAZ is becoming larger when the pulse length is longer, and the thermal effect depth is as the same trend as the HAZ. As a result, when long pulse laser interaction with CFRP material, the thermal effect is the significant value to analysis the process, which is mostly effect by laser fluence and pulse length. For laser machining in different industries, the laser parameter choose should be different. The shorter pulse length laser is suitable for the laser machining which requires high accuracy, and the longer one is better for the deeper or larger ablation holes.

Proceedings Article | 18 December 2014 Paper

Study on temperature distribution characteristics of alumina irradiating by irregular laser

Di Wang, Guangyong Jin, Zhi Wei, Boshi Yuan, Chuanhui Fan

Proceedings Volume 9295, 92950U (2014) https://doi.org/10.1117/12.2073038

KEYWORDS: Pulsed laser operation, Laser irradiation, Laser energy, Laser processing, Wavefront distortions, Numerical simulations, Energy transfer, Laser applications, Laser beam propagation, Fluctuations and noise

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Proceedings Article | 18 December 2014 Paper

Analysis of thermodynamic effect in Si irradiated by pulsed-laser

Ming Guo, Guangyong Jin, Mingxin Li, Yao Ma, Boshi Yuan, Huadong Yu

Proceedings Volume 9295, 92950S (2014) https://doi.org/10.1117/12.2073029

KEYWORDS: Silicon, Semiconductor lasers, Pulsed laser operation, Laser energy, 3D modeling, Laser irradiation, Temperature metrology, Laser applications, Thermal effects, Thermodynamics

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According to the heat conduction equation, thermoelastic equation and boundary conditions of finite, using the finite element method(FEM), established the three-dimensional finite element calculation model of thermal elastic ,numerical simulation the transient temperature field and stress field distribution of the single crystal silicon materials by the pulsing laser irradiation, and analytic solution the temperature distribution and stress distribution of laser irradiation on the silicon material , and analyzes the different parameters such as laser energy, pulse width, pulse number influence on temperature and stress, and the intrinsic damage mechanism of pulsed laser irradiation on silicon were studied. The results show that the silicon material is mainly in hot melt under the action of ablation damage.According to the irradiation of different energy and different pulse laser ,we can obtain the center temperature distribution, then get the law of the change of temperature with the variation of laser energy and pulse width in silicon material; according to the principal stress and shear stress distribution in 110 direction with different energy and different pulse, we can get the law of the change of stress distribution with the variation of laser energy and pulse width ;according to the principal stress distribution of single pulse and pulse train in 110 direction, we can get the law of the change of stress with pulse numbers in silicon.When power density of laser on optical material surface (or energy density) is the damage threshold, the optical material surface will form a spontaneous, periodic, and permanent surface ripple, it is called periodic surface structure laser induced (LIPSS).It is the condensed optical field of work to generate low dimensional quantum structures by laser irradiation on Si samples. The pioneering work of research and development and application of low dimensional quantum system has important academic value.The result of this paper provides theoretical foundation not only for research of theories of Si and substrate thermal stress damage and its numerical simulation under laser radiation but also for pulse laser technology and widening its application scope.

Proceedings Article | 18 December 2014 Paper

Numerical simulation for influence of pulse width on the temperature field of unidirectional carbon fiber

Boshi Yuan, Guangyong Jin, Zhi Wei, Di Wang, Yao Ma

Proceedings Volume 9295, 92950P (2014) https://doi.org/10.1117/12.2072885

KEYWORDS: Carbon, Fiber lasers, Pulsed laser operation, Laser energy, 3D modeling, Laser irradiation, Temperature metrology, Composites, Anisotropy, Numerical simulations

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The unidirectional carbon fiber material is commonly used in the Carbon Fiber Reinforced Plastics (CFRP). The COMSOL Multiphysics finite element analysis software was utilized in this paper. And the 3D anisotropy model, which based on heat conduction equation, was established to simulate the temperature field of the carbon fiber irradiated by pulse laser. The research focused on the influences of the laser width on the material temperature field. The thermal analysis results indicated that during the process of irradiation, the temperature field distribution of the carbon fiber was different from the distribution of laser spot on the surface. The incident laser is Gauss laser, but the temperature field distribution presented oval. It resulted from the heat transfer coefficient of carbon fiber was different in the axial and in the radial. The temperature passed along the fiber axial faster than the radial. Under the condition of the laser energy density constant, and during the laser irradiation time, the depth of the carbon fiber temperature field increased with the pulse width increasing, and the area of the carbon fiber temperature field increased with the pulse width increasing, However, the temperature of the laser irradiated center showed a trend of decrease with the increasing of pulse width. The results showed that when the laser affection was constant, the laser energy affected on the carbon fiber per unit time was increased with the decrease of the pulse width. Due to the limits of the heat transfer coefficient of the material and laser irradiation time, the energy was injected in carbon fiber within a short time. With the reducing of the heat conduction area, the depth and the area of the temperature field would be also decreased. With the increase of pulse width, the time of energy injected in carbon fiber was increased, and the laser energy affected on the carbon fiber per unit time was decrease. With the heat conduction area increasing, the depth and area of the temperature field would be also increased. In this paper, the rule of the temperature field changing with the pulse width was consistent with the law of conservation of energy and the heat conduction.

Proceedings Article | 18 December 2014 Paper

Research on the thermal effect of copper between adjacent pulses under moving laser irradiation

Boshi Yuan, Guangyong Jin, Di Wang, Zhi Wei, HuaDong Yu

Proceedings Volume 9295, 92950M (2014) https://doi.org/10.1117/12.2072862

KEYWORDS: Copper, Pulsed laser operation, Laser irradiation, Thermal effects, Copper vapor lasers, Optical simulations, Metals, Laser applications, Optimization (mathematics), Finite element methods

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