Closed form solutions for thermal stress field due to non-equilibrium heating during laser short-pulse irradiation

2012 ◽  
Vol 407 (12) ◽  
pp. 2169-2175 ◽  
Author(s):  
B.S. Yilbas ◽  
A.Y. Al-Dweik
Keyword(s):  
Thermal Stress ◽  
Stress Field ◽  
Closed Form ◽  
Short Pulse ◽  
Pulse Irradiation ◽  
Closed Form Solutions ◽  
Thermal Stress Field ◽  
Non Equilibrium

Thermal stress analysis and entropy generation rate due to laser short pulse heating of a metallic surface

2014 ◽  
Vol 92 (12) ◽  
pp. 1681-1687 ◽  
Author(s):  
Bekir Sami Yilbas ◽  
Haider Ali ◽  
Ahmad Yousef Al-Dweik
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Stress Field ◽  
Entropy Generation ◽  
Pulse Heating ◽  
Short Pulse ◽  
Entropy Generation Rate ◽  
Metallic Surface ◽  
Thermodynamic Irreversibility ◽  
Thermal Stress Field

An analytical solution is developed for thermal stress in exponentially time decaying laser short-pulse heating of a metallic surface. Because the heating duration is short, a nonequilibrium heating model incorporating the electron kinetic theory approach is used to formulate the temperature distribution during the laser heating pulse. Thermomechanical coupling is introduced in the analysis to formulate the thermal stress field. Thermodynamic irreversibility is considered and the entropy generation rate due to heat transfer and thermal stress field is formulated during the heating process. It is found that temperature decays gradually in the surface region and becomes sharp as the distance increases towards the solid bulk. Thermal stress is compressive in the irradiated region. Thermodynamic irreversibility due to heat transfer dominates thermodynamic irreversibility because of the thermal stress field.

Effects of Scanning Patterns on the Thermal/Stress Field during Laser Solid Forming T-Shape Chord of Ti-6Al-4V Alloy

2014 ◽  
Vol 41 (7) ◽  
pp. 0703003
Author(s):  
姜亚琼 Jiang Yaqiong ◽  
林鑫 Lin Xin ◽  
马良 Ma Liang ◽  
谭华 Tan Hua ◽  
杨海欧 Yang Haiou ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Stress Field ◽  
Laser Solid Forming ◽  
Thermal Stress Field

Calculation and Analysis of 2-D Thermal Stress Field in Induction Motor with Compound Cage Rotor under Different Load

2011 ◽  
Vol 117-119 ◽  
pp. 97-100
Author(s):  
Jun Ci Cao ◽  
Rong Chao Qian ◽  
Wei Li Li
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Stress Field ◽  
Induction Motor ◽  
Reference Value ◽  
Single Site ◽  
Compound Material ◽  
Thermal Stress Field ◽  
New Type ◽  
Cage Rotor

3kW two poles induction motor with compound cage rotor is illustrated in this paper, and 2-D thermal stress field of induction motor rotor is calculated and analyzed by finite element. Contrasting with common induction motor, induction motor with compound cage rotor has specific rotor shot shape and the bar is comprised of the upper compound material and the lower cast aluminium, which cause distribution of thermal stress is special. The motor with the rotor shot of compound material laid at single site is chosen to analyzing. The maximum thermal stress in the bar is calculated at different load, and the distribution of thermal stress in the bar is analyzed at rate load. The law of distribution of thermal stress in the bar has same reference value for designing new type of induction motor.

Investigation on Temperature Field and Thermal Stress of Dish Solar Concentrator’s Focal Region

2011 ◽  
Vol 148-149 ◽  
pp. 20-23
Author(s):  
Xing Zhi Wang ◽  
Yong Shuai ◽  
Fu Qiang Wang ◽  
Chun Liang Yu
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Infrared Camera ◽  
Radiant Heat ◽  
Focal Region ◽  
Solar Concentrator ◽  
Flux Function ◽  
Thermal Stress Field ◽  
Good Accordance

Depending on the solar radiant flux and velocity measured in Harbin, with finite element method, use a modified radiant heat flux function to calculate the temperature field of a plate on the focal region of a dish solar concentrator. Compared the result with picture taken by infrared camera, there is a good accordance between them. The temperature field is used as the loading parameters to calculate the thickness’s impact on the thermal stress field in the plate. When the value of the thickness increases, the maximum values of the stress increase, but the overall stress field tend to decrease.

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