scholarly journals Validation of Heat Conduction 2D Analytical Model in Spherical Geometries using infrared Thermography

2012 ◽  
Author(s):  
C. San Martín ◽  
C. Torres ◽  
D. Esparza ◽  
D. Bonilla ◽  
R. Donoso
Keyword(s):  
Heat Conduction ◽  
Infrared Thermography ◽  
Analytical Model

scholarly journals Influence of the Static Pre-Stress in Micro-Viscothermoelastic Resonators Based on Dual-Phase-Lagging Heat Conduction

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Najat A. Alghamdi ◽  
Hamdy M. Youssef
Keyword(s):  
Heat Conduction ◽  
Energy Dissipation ◽  
Thermal Behavior ◽  
Quality Factor ◽  
Analytical Model ◽  
Relaxation Times ◽  
Mechanical Relaxation ◽  
Length Scale ◽  
Dual Phase ◽  
Quality Factors

Thermal and mechanical relaxation times play vital roles in the values of the quality factor of micro/nanoresonators. They can control the energy dissipation across the coupling of mechanical and thermal behavior. In this paper, we introduce an analytical model that considers a pre-stress in a micro-viscothermoelastic resonator to modify the thermal and mechanical relaxation times and thus higher the quality factor. The impacts of length scale and static pre-stress on the quality factor have been discussed. The model expects that significant improvement in terms of quality factors is possible by tuning the pre-stress and the thermal and mechanical relaxation times parameters, and the isothermal value of frequency have significant effects on the thermal quality factor of the resonators.

Identification and Reconstruction of Cracks in Ultrasonic Infrared Thermography

2012 ◽  
Vol 249-250 ◽  
pp. 46-50 ◽  
Author(s):  
Fu Zhou Feng ◽  
Chao Sheng Zhang ◽  
Qing Xu Min ◽  
Peng Cheng Jiang
Keyword(s):  
Image Processing ◽  
Heat Conduction ◽  
Infrared Thermography ◽  
Infrared Imaging ◽  
Ultrasonic Pulse ◽  
Detection Technique ◽  
One Dimension ◽  
Pulse Excitation ◽  
Conduction Model ◽  
Ultrasonic Infrared Thermography

Ultrasonic infrared thermography is a novel nondestructive detection technique, which combines a short ultrasonic pulse excitation and infrared imaging to detect defects, such as crack, in materials and structures. A simplified one-dimension heat-conduction model excited by ultrasonic pulses is put forward in this paper. Based on this model, a serial of image processing methods for recognition and reconstruction of cracks were presented. Results obtained show that the proposed method is creditable and applicable.

Effect of the Frequency of the Cyclic Load to the Inverse Analyses of the Heat Conduction in Infrared Thermography

2006 ◽  
Vol 326-328 ◽  
pp. 1137-1140 ◽  
Author(s):  
Kenji Machida ◽  
Shohei Miyagawa
Keyword(s):  
Heat Conduction ◽  
Infrared Thermography ◽  
Hybrid Method ◽  
Inverse Analysis ◽  
Measurement Method ◽  
Cyclic Load ◽  
Stress Measurement ◽  
Hybrid Analysis ◽  
Element Analysis ◽  
Stress Components

Influence of the frequency to the temperature image obtained by an infrared thermography was investigated using specimens of three kinds of materials at four kinds of frequencies of the cyclic load. Then, the infrared hybrid method was developed to separate individual stress components. However, the influence of heat conduction is inevitable in the infrared stress measurement method. Therefore, an error arises in the infrared hybrid analysis. Then, the system which corrects the error by the inverse analysis was developed. Thereby, the accuracy of the stress intensity factor was able to be raised. Furthermore, the accuracy of hybrid method considering to heat conduction was discussed in comparison with the 3-D finite element analysis and 2-D hybrid method.

scholarly journals Modelling and Prediction of Cutting Temperature in the Machining of H13 Hard Steel of Transient Heat Conduction

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3176
Author(s):  
Jingjie Zhang ◽  
Xiangfei Meng ◽  
Jin Du ◽  
Guangchun Xiao ◽  
Zhaoqiang Chen ◽  
...  
Keyword(s):  
Heat Conduction ◽  
Analytical Model ◽  
Cutting Tools ◽  
Cutting Temperature ◽  
Transient State ◽  
Transient Heat Conduction ◽  
Conduction Model ◽  
Cutting Heat ◽  
Fourier Heat Conduction ◽  
Pass Through

Cutting heat conduction undergoes three stages that include intensity transient-state, transient-state, and steady-states. Especially during machining with coated cutting tools, in the conduction process, cutting heat needs to pass through a few micron thick coatings and then flow into the tool body. This heat conduction presents typical non-Fourier heat conduction characteristics. This paper focuses on the cutting temperature in transient heat conduction with a coated tool. A new analytical model to characterize the thermal shock based on the non-Fourier heat conduction was proposed. The distribution of cutting temperature in mono-layer coated tools during the machining was then illustrated. The cutting temperature distribution predicted by the Fourier heat conduction model was employed to compare with that by non-Fourier heat conduction in order to reveal the non-Fourier heat conduction effect in transient heat conduction. The results show that the transient heat conduction analytical model is more suitable for the intensity transient-state and transient-state in the process of cutting heat conduction.

Sign in / Sign up

Export Citation Format

Share Document