Numerical simulation of thermal stress damage in 1064 nm anti-reflection fused silica by millisecond pulsed laser

Optik ◽  
2017 ◽  
Vol 136 ◽  
pp. 144-150 ◽  
Author(s):  
J.X. Cai ◽  
M. Guo ◽  
G.Y. Jin
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Pulsed Laser ◽  
Fused Silica ◽  
Stress Damage

Numerical Simulation of Ablation Behavior and Thermal Stress Field of Fused Silica Composite

2008 ◽  
Vol 5 (8) ◽  
pp. 1722-1724
Author(s):  
Desheng Lu ◽  
Jiahu Ouyang ◽  
Yu Zhou ◽  
Dechang Jia ◽  
Yujin Wang
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Stress Field ◽  
Fused Silica ◽  
Silica Composite ◽  
Thermal Stress Field

Numerical Simulation of Thermal Stress Fields in Thermoplastics in a Pulsed Laser Welding Process

2007 ◽  
Author(s):  
Gregory J. Kowalski ◽  
Richard A. Whalen
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulse Velocity ◽  
Thin Layers ◽  
Published Data ◽  
Simulation Code ◽  
Incident Laser Radiation ◽  
Lap Welding

A numerical simulation code is developed and used to derive relationships between the incident laser radiation, the thermal stress field, and the size and shape of the heat affected (HAZ) and melt zones for a pulsed laser transmission welding process. The material used in the investigation is a high density polyethylene thermal plastic. The numerical model uses the Fourier heat conduction thermal model and the welding process involves the lap welding of two thin layers of thermoplastic films with the welding conditions of a transparent material over a semi-transparent or opaque material. The Fourier model is valid due to the high thermal pulse velocity through the material. The results are compared to the published data on thermoplastic welding criteria and the legitimacy of these criteria are discussed.

Numerical simulation of different pulse width of long pulsed laser on aluminum alloy

2015 ◽  
Author(s):  
Mingxin Li ◽  
Guangyong Jin ◽  
Wei Zhang ◽  
Guibo Chen ◽  
Juan Bi
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Pulse Width ◽  
Pulsed Laser

scholarly journals Thermal–Fluid–Solid Coupling Analysis on the Temperature and Thermal Stress Field of a Nickel-Base Superalloy Turbine Blade

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3315
Author(s):  
Liuxi Cai ◽  
Yao He ◽  
Shunsen Wang ◽  
Yun Li ◽  
Fang Li
Keyword(s):  
Thermal Stress ◽  
Temperature Gradient ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Nickel Base Superalloy ◽  
Barrier Coating ◽  
Thermal Stress Field ◽  
Nickel Base ◽  
Stress Damage ◽  
Superalloy Turbine Blade

Based on the establishment of the original and improved models of the turbine blade, a thermal–fluid–solid coupling method and a finite element method were employed to analyze the internal and external flow, temperature, and thermal stress of the turbine blade. The uneven temperature field, the thermal stress distribution characteristics of the composite cooling turbine blade under the service conditions, and the effect of the thickness of the thermal barrier coating (TBC) on the temperature and thermal stress distributions were obtained. The results show that the method proposed in this paper can better predict the ablation and thermal stress damage of turbine blades. The thermal stress of the blade is closely related to the temperature gradient and local geometric structure of the blade. The inlet area of the pressure side-platform of the blade, the large curvature region of the pressure tip of the blade, and the rounding between the blade body and the platform on the back of the blade are easily damaged by thermal stress. Cooling structure optimization and thicker TBC thickness can effectively reduce the high temperature and temperature gradient on the surface and inside of the turbine blade, thereby reducing the local high thermal stress.

Study on thermal stress of the the fused silica irradiated by millisecond–nanosecond combined pulse laser

Pramana ◽  
2021 ◽  
Vol 95 (4) ◽  
Author(s):  
Shengqiang Xia ◽  
Jixing Cai ◽  
Xiaoyun Zhang ◽  
Jingyi Li ◽  
Guangyong Jin ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Pulse Laser ◽  
Fused Silica

FEM Analysis of Contact for Converter Spherical Hinge

2013 ◽  
Vol 365-366 ◽  
pp. 331-334
Author(s):  
Xue Ping Ren ◽  
Jian Da Gao
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Optimum Design ◽  
Theoretical Basis ◽  
Fem Analysis ◽  
Structure Design ◽  
Coupling Field ◽  
Main Components ◽  
Spherical Hinge

The role of converter spherical hinge is one of the main components, combined with practical work and With help of FEM, Thermal Stress coupling field of spherical washer can been obtained through numerical simulation. The result supplies substantial theoretical basis for further structure design and optimum design of mechanism.

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