Analysis of Coupled Electro-Thermal-Mechanical of Micro Gas Pressure Sensor Based on Micro-Hotplate Technology

2009 ◽  
Vol 60-61 ◽  
pp. 119-124
Author(s):  
Ren Cheng Jin ◽  
Wu Jin Zhang ◽  
Zhe Nan Tang ◽  
Jia Qi Wang ◽  
Ming Liang Shao
Keyword(s):  
Constant Temperature ◽  
Pressure Sensor ◽  
Thermal Deformation ◽  
Thickness Distribution ◽  
Mechanical Analysis ◽  
Gas Pressure ◽  
Constant Current ◽  
Sensor Signal ◽  
Signal Output ◽  
Thermal Mechanical Analysis

The effect of micro-hotplate (MHP) thermal deformation on the signal output of the MHP-based micro gas pressure sensor is investigated. Combining electro-thermal theoretical analysis and thermal-mechanical finite element modeling, different electro-thermal-mechanical analysis models of the sensors are built and solved at constant current condition and constant temperature condition respectively. The calculated results show that the MHP thermal deformation has little effect on the sensor signal output over the entire pressure range at constant current condition, I=0.7mA. While at constant temperature condition, Ts=400K, thermal deformation has little effect on the sensor signal output at low gas pressure, but at high pressure the effect are great. Moreover, according to the thermal-mechanical analysis, we find that optimizing thickness distribution of thin films in the MHP suspended structure can reduce thermal deformation effectively at higher temperature when the lateral dimension is same, which presents a practicable method to improve the sensor stability.

Accurate Measurement of CTE of Aluminum Alloy 7050-T7451 and the Impact on Thermal Deformation Analysis

2012 ◽  
Vol 566 ◽  
pp. 476-479
Author(s):  
Fu Lai Sun ◽  
Jie Sun ◽  
Jian Feng Li ◽  
Liang Yu Song ◽  
Yu Guo Luo
Keyword(s):  
Aluminum Alloy ◽  
Thermal Deformation ◽  
Great Influence ◽  
Mechanical Analysis ◽  
Alloy Sheet ◽  
Deformation Analysis ◽  
Linear Expansion Coefficient ◽  
Mathematical Functions ◽  
Thermal Mechanical Analysis ◽  
The Impact

Linear expansion coefficient (CTE) is one of the important thermal parameters for materials, which has a great influence on the thermal deformation analyzing. Thermal Mechanical Analysis (TMA) is adopted to measure the CTE of pre-stretched aluminum alloy sheet 7050-T7451 in three vertical directions. The mathematical functions of CTE of aluminum alloy 7050-T7451 are established, which is with three directions and reflect the influence of the temperature. A comparison between the accurate CTE data and the CTE from reference is carried out .The reason of the CTE variation of aluminum 7050-T7451 with temperature also been explained qualitatively.

scholarly journals Remote Gas Pressure Sensor Based on Fiber Ring Laser Embedded With Fabry–Pérot Interferometer and Sagnac Loop

2016 ◽  
Vol 8 (5) ◽  
pp. 1-8 ◽  
Author(s):  
Jia Shi ◽  
Yuye Wang ◽  
Degang Xu ◽  
Yixin He ◽  
Junfeng Jiang ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Ring Laser ◽  
Gas Pressure ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Fabry Perot

scholarly journals Numerical aspects for efficient welding computational mechanics

2014 ◽  
Vol 18 (suppl.1) ◽  
pp. 139-148
Author(s):  
Tarek Aburuga ◽  
Aleksandar Sedmak ◽  
Zoran Radakovic
Keyword(s):  
Residual Stresses ◽  
Three Dimensional ◽  
Shell Element ◽  
Element Model ◽  
Mechanical Analysis ◽  
Tensile Test Specimen ◽  
Integrity Assessment ◽  
Mass Scaling ◽  
Three Dimensional Models ◽  
Thermal Mechanical Analysis

The effect of the residual stresses and strains is one of the most important parameter in the structure integrity assessment. A finite element model is constructed in order to simulate the multi passes mismatched submerged arc welding SAW which used in the welded tensile test specimen. Sequentially coupled thermal mechanical analysis is done by using ABAQUS software for calculating the residual stresses and distortion due to welding. In this work, three main issues were studied in order to reduce the time consuming during welding simulation which is the major problem in the computational welding mechanics (CWM). The first issue is dimensionality of the problem. Both two- and three-dimensional models are constructed for the same analysis type, shell element for two dimension simulation shows good performance comparing with brick element. The conventional method to calculate residual stress is by using implicit scheme that because of the welding and cooling time is relatively high. In this work, the author shows that it could use the explicit scheme with the mass scaling technique, and time consuming during the analysis will be reduced very efficiently. By using this new technique, it will be possible to simulate relatively large three dimensional structures.

Suppressing Cracking in Resistance Welding AA5754 by Mechanical Means

2000 ◽  
Author(s):  
Hongyan Zhang ◽  
Jacek Senkara ◽  
Xin Wu
Keyword(s):  
Temperature Field ◽  
Crack Initiation ◽  
Spot Welding ◽  
Mechanical Analysis ◽  
Crack Initiation And Propagation ◽  
State Of Stress ◽  
Initiation And Propagation ◽  
Thermal Mechanical Analysis ◽  
The Impact ◽  
Analytical Approaches

Abstract In this paper mechanical aspects of cracking during single- and multi-spot welding of AA5754 was investigated by both experimental and analytical approaches. The impact of mechanical loading on crack initiation and propagation was studied with the consideration of various process parameters including the loading imposed by electrodes, the formation of liquid nugget, and constraining factors during and after welding. Tensile properties of AA5754 and their dependence on the temperature were tested at room and up to solidus temperatures, in order to provide a reference of cracking stress. Thermal-mechanical analysis was conducted based on the temperature field around the nugget and the state of stress encountered during welding. This analysis revealed that tensile stress might build up in the vicinity of the nugget during cooling, thus explained the experimental observation. General guidelines for suppressing cracking were proposed, i.e. to provide sufficient constraint around the weld spot during and after welding.

Upgrade of FROBA code and its application in thermal-mechanical analysis of space reactor fuel

2018 ◽  
Vol 332 ◽  
pp. 297-306 ◽  
Author(s):  
Yangbin Deng ◽  
Yingwei Wu ◽  
Cheng Gong ◽  
Dalin Zhang ◽  
Wenxi Tian ◽  
...  
Keyword(s):  
Mechanical Analysis ◽  
Reactor Fuel ◽  
Space Reactor ◽  
Thermal Mechanical Analysis
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