Simulation of Temperature Field during the Laser Sintering Process of Nano-Hydroxyapatite Powder

2011 ◽  
Vol 314-316 ◽  
pp. 626-629 ◽  
Author(s):  
Ci Jun Shuai ◽  
Pei Feng ◽  
Cheng De Gao ◽  
Ying Zhou ◽  
Shu Ping Peng
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Finite Element Model ◽  
Laser Power ◽  
Element Model ◽  
Laser Sintering ◽  
Laser Spot ◽  
Sintering Process ◽  
Sintering Time ◽  
Hydroxyapatite Powder

A three-dimensional finite element model has been created to study the change rules of temperature field during the laser sintering process of nano-hydroxyapatite powder. The numerical simulation of temperature distribution has been achieved based on the equivalence between the sintering time and the sintering speed. The simulation results show that the temperature declines gradually along the radial direction of the laser spot. At the same time, there was the largest temperature gradient at the edge of the laser spot. The temperature of sintering layer rises with the increase of laser power linearly when the other process parameters are the same. The maximum sintering temperature is 1320°C with laser power of 8.75W, laser spot diameter of 4mm, sintering time of 5s and layer thickness of 0.2mm. The test results verify that nano-hydroxyapatite powder could be sintered under this process condition. It shows that the finite element model can be used to simulate the temperature field during the laser sintering process.

Analysis of the Temperature Field of the Diamond Wheel Dressed Using Laser Assisted Ultrasonic-Vibration Combined Dressing Method

2016 ◽  
Vol 874 ◽  
pp. 261-267 ◽  
Author(s):  
Zhi Bo Yang ◽  
Zhen Zhang ◽  
Rui Yun Yang ◽  
Ai Ju Liu
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Finite Element Model ◽  
Ultrasonic Vibration ◽  
Working Conditions ◽  
Element Model ◽  
Diamond Wheel ◽  
Dressing Method ◽  
Infrared Temperature Measurement ◽  
The Finite Element Model

During the dressing process of diamond wheel using laser/ultrasonic-vibration combined dressing method, the removal mode of the local materials on the surface of wheel with the use of laser’s heating effect transits from brittle fracture to plastic flow, so that the wear of diamond dresser can be reduced and the dressing efficiency and surface dressing quality can be improved. Using ANSYS analysis software, the three-dimensional units were used and the nonlinearity of the material’s thermophysical properties was taken into account, and thereby, the finite element model of the temperature field of the diamond wheel heated by the laser during the dressing process was constructed. Then, the distributions of the temperature field on the surface and section of the wheel under different technological parameter were acquired. Moreover, the temperature distribution of the dressed wheel under actual working conditions was measured using infrared temperature measurement method. The results indicate that, under the same working conditions, the simulation results using finite element model fit well with the measured values, i.e., the finite element model has important guiding significance to the selection of technological parameters in dressing.

A geometrical finite element model of the sintering process of advanced ceramics

1995 ◽  
Vol 3 (4) ◽  
pp. 457-464 ◽  
Author(s):  
A. Tsvelikh ◽  
W. Thompson ◽  
A. Easton ◽  
I. Freshwater
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Sintering Process ◽  
Advanced Ceramics
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