Thermal and mechanical finite element analysis of a VLSI package including spatially varying thermal contact resistance

2002 ◽  
Author(s):  
B.R. Simon ◽  
Y. Yuan ◽  
J.R. Umaretiya ◽  
R. Bavirisetty ◽  
J.L. Prince
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Element Analysis ◽  
Spatially Varying

Effect of Thermal Contact Resistance on Alumina Molten Particle Impacting onto a Metal Substrate

2012 ◽  
Vol 326-328 ◽  
pp. 482-487 ◽  
Author(s):  
S. Oukach ◽  
Bernard Pateyron ◽  
H. Hamdi ◽  
M. El Ganaoui
Keyword(s):  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Droplet Diameter ◽  
Thermal Contact ◽  
Thermal Spraying ◽  
Droplet Spreading ◽  
Element Analysis ◽  
Molten Droplet ◽  
Molten Droplets ◽  
Droplet Sizes

In this paper, a Finite Element Analysis is carried out in order to simulate the process of spreading and solidification of a micrometric molten droplet impinging onto a cold substrate. This process is a crucial key to have a good understanding of coatings obtained by means of thermal spraying. The effect of thermal contact resistance (TCR) on the droplet spreading and solidification was investigated using different values of TCR and different droplet sizes. The solidification time was found to be a linear function of the droplet diameter square. Viscous dissipation, wettability and surface tension effects are taken into account. The Level Set method was employed to explicitly track the free surface of molten droplets.

Finite Element Simulation of the Tightening Process of Bolted Joint With a Bolt Heater

2002 ◽  
Vol 124 (4) ◽  
pp. 457-464 ◽  
Author(s):  
Toshimichi Fukuoka ◽  
Quantuo Xu
Keyword(s):  
Finite Element ◽  
Contact Resistance ◽  
Finite Element Simulation ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Numerical Approach ◽  
Numerical Analyses ◽  
Bolted Joint ◽  
Skilled Workers ◽  
Element Simulation

The tightening operation with a bolt heater has advantages surpassing those of other tightening methods. Currently, a bolt heater is mainly applied to tighten huge bolts that cannot be clamped by other means, and the tightening operation is usually supported by the expertise of skilled workers. In this paper, a numerical approach is presented to aim at a broader use of bolt heater technique by elucidating the tightening mechanism. The effects of thermal contact resistance existing around a bolted joint are taken into account for a better accuracy in the numerical analyses. Based on the numerical results obtained, a series guideline to help the tightening operation when performed by less skilled workers is proposed.

Finite Element Modeling of Multi-Scale Thermal Contact Resistance

2008 ◽  
Author(s):  
M. K. Thompson
Keyword(s):  
Finite Element ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Unit Area ◽  
Thermal Contact ◽  
Contact Model ◽  
Micro Scale ◽  
Multi Scale ◽  
Macro Scale ◽  
Scale Surface

Many traditional macro scale finite element models of thermal contact systems have incorporated the effect of micro scale surface topography by applying a constant value of thermal contact conductance (TCC) per unit area to the regions in contact. However, it has been very difficult to determine an appropriate TCC value for a given system and analysts typically had to rely on experimental data or values from the literature. This work presents a method for predicting micro scale TCC per unit area by incorporating micro scale surface roughness in a multi-scale iterative thermal/structural finite element contact model. The resulting TCC value is then used in a macro scale thermal/structural contact model with apparent surface form to predict the thermal contact resistance and overall thermal resistance for a commercial power electronics module.

The Testing and Finite Element Analysis of Temperature Distribution and Thermal Deformation in Vertical Machining Center

2012 ◽  
Vol 538-541 ◽  
pp. 730-734
Author(s):  
Bing Fang ◽  
Lei Zhang ◽  
Jian Fu Zhang ◽  
Ya Hong Li
Keyword(s):  
Temperature Distribution ◽  
Contact Resistance ◽  
Thermal Deformation ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Measuring Method ◽  
Temperature Fields ◽  
Element Analysis ◽  
Fea Model ◽  
Machining Center

This paper presented a real-time measuring method of temperature fields and thermal deformations in vertical machining center. And a FEA model including the thermal contact resistance at interface for evaluating the temperature distribution and tools deformation in vertical machining center (VMC) was established. Compared with the experiment results, it is shown that the new model is much more accurate than the traditional model without considering thermal contact resistance at interface.

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