Extracting model parameters from thermal transient measurements for thermal stress simulation

2014 ◽  
Author(s):  
Zoltan Sarkany ◽  
Marta Rencz
Keyword(s):  
Thermal Stress ◽  
Model Parameters ◽  
Thermal Transient ◽  
Stress Simulation ◽  
Transient Measurements

Thermoelectric properties and thermal stress simulation of pressureless sintered SiC/AlN ceramic composites at high temperatures

2018 ◽  
Vol 182 ◽  
pp. 302-313 ◽  
Author(s):  
Dina H.A. Besisa ◽  
Emad M.M. Ewais ◽  
Essam A.M. Shalaby ◽  
Andrey Usenko ◽  
Denis V. Kuznetsov
Keyword(s):  
Thermal Stress ◽  
High Temperatures ◽  
Thermoelectric Properties ◽  
Ceramic Composites ◽  
Stress Simulation

scholarly journals Multiple Heat Source Thermal Modeling and Transient Analysis of LEDs

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1860 ◽  
Author(s):  
Anton Alexeev ◽  
Grigory Onushkin ◽  
Jean-Paul Linnartz ◽  
Genevieve Martin
Keyword(s):  
Heat Source ◽  
Transient Analysis ◽  
Thermal Power ◽  
Finite Element Models ◽  
Heat Sources ◽  
Thermal Measurements ◽  
Thermal Transient ◽  
Transient Thermal ◽  
Transient Measurements

Thermal transient testing is widely used for LED characterization, derivation of compact models, and calibration of 3D finite element models. The traditional analysis of transient thermal measurements yields a thermal model for a single heat source. However, it appears that secondary heat sources are typically present in LED packages and significantly limit the model’s precision. In this paper, we reveal inaccuracies of thermal transient measurements interpretation associated with the secondary heat sources related to the light trapped in an optical encapsulant and phosphor light conversion losses. We show that both have a significant impact on the transient response for mid-power LED packages. We present a novel methodology of a derivation and calibration of thermal models for LEDs with multiple heat sources. It can be applied not only to monochromatic LEDs but particularly also to LEDs with phosphor light conversion. The methodology enables a separate characterization of the primary pn junction thermal power source and the secondary heat sources in an LED package.

scholarly journals Thermal Stress Simulation on a Stainless-steel Submersible Water Heater design

2020 ◽  
Vol 981 ◽  
pp. 042028
Author(s):  
S K Singh ◽  
G Alok ◽  
R Ande ◽  
C Pravalika ◽  
N Sindhuja ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Thermal Stress ◽  
Water Heater ◽  
Heater Design ◽  
Stress Simulation

Non-Destructive Tracking of Structural Changes of Concrete Mixtures during Thermal Stress

2014 ◽  
Vol 617 ◽  
pp. 152-155 ◽  
Author(s):  
Ivo Kusák ◽  
Miroslav Lunak ◽  
Zdeněk Chobola
Keyword(s):  
Thermal Stress ◽  
Structural Reliability ◽  
Structural Changes ◽  
Dielectric Material ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Model Parameters ◽  
Debye Theory ◽  
Concrete Mixtures ◽  
Non Destructive

This paper deals with the application of the method of impedance spectroscopy to testing of cement-based composites prepared from a mix of cement mortar and quartz sand, which were intentionally degraded by high-temperature treatment (in the temperatures range from 25 °C to 400 °C). The monitoring of structural changes in the thermal stress is very important, for example for determining the reliability of the whole structure. Based on the Debye theory of dielectric the models were created, their applications and received parameters measured dielectric material is characterized and discussed the uniqueness of determining the values of model parameters. Development of electrical parameters and permittivity at each temperature areas reliably show these structural changes and thus the structural reliability.

Anisotropic Thermal Stress Simulation with Complex Crystal–Melt Interface Evolution for Seeded Growth of Monocrystalline Silicon

2012 ◽  
Vol 12 (11) ◽  
pp. 5708-5714 ◽  
Author(s):  
Bing Gao ◽  
Satoshi Nakano ◽  
Hirofumi Harada ◽  
Yoshiji Miyamura ◽  
Takashi Sekiguchi ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Monocrystalline Silicon ◽  
Seeded Growth ◽  
Interface Evolution ◽  
Complex Crystal ◽  
Stress Simulation
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