scholarly journals Detecting and Monitoring Cracks in Aerospace Materials Using Post-Processing of TSA and AE Data

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 748 ◽  
Author(s):  
Ceri A. Middleton ◽  
John P. McCrory ◽  
Richard J. Greene ◽  
Karen Holford ◽  
Eann A. Patterson
Keyword(s):  
Thermoelastic Stress ◽  
Infrared Camera ◽  
Mapping Method ◽  
Location Information ◽  
Thermoelastic Stress Analysis ◽  
Post Processing ◽  
Aerospace Materials ◽  
Stress Concentrations ◽  
Optical Flow Method ◽  
Distribution Of Stress

Thermoelastic stress analysis (TSA) is a non-contact technique for measuring the distribution of stress in the surface of a component subject to cyclic loading by using a sensitive infrared camera. The stress concentrations indicative of a crack can be located and tracked using an optical flow method, allowing the position of the crack-tip to be identified at a given time. Acoustic emission (AE) has been used to validate the TSA algorithm. AE events from cracking, located using the Delta-T Mapping method, were detected several seconds before the TSA algorithm first detected cracking; however, TSA provided significantly more accurate location information.

Combined thermoelastic stress analysis and digital image correlation with a single infrared camera

2011 ◽  
Vol 46 (8) ◽  
pp. 783-793 ◽  
Author(s):  
M L Silva ◽  
G Ravichandran
Keyword(s):  
Digital Image Correlation ◽  
Stress Analysis ◽  
Digital Image ◽  
Thermoelastic Stress ◽  
Infrared Camera ◽  
Image Correlation ◽  
Measured Temperature ◽  
Thermoelastic Stress Analysis ◽  
Alloy Plate ◽  
Full Field

A novel methodology simultaneously combining thermoelastic stress analysis (TSA) and digital image correlation (DIC) with a single infrared camera is presented. DIC is an optical method to determine deformation by image tracking with strains determined via differentiation. TSA is a non-contact measurement technique that provides the full-field stress directly using measured temperature changes. The combination of the two techniques improves the resolution and accuracy of TSA results by correcting for sample motion and distortion during loading. Illustrative examples, including an aluminium alloy plate with an edge crack and a nylon plate with a hole under tension, demonstrate the combined method which simultaneously measures stress and displacement.

scholarly journals Thermoelastic Stress Analysis and Dissipated Energy Evaluation Using Infrared-Optical Synchronous Measurement

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 50
Author(s):  
Daiki Shiozawa ◽  
Yuji Uchida ◽  
Kazuki Kobayashi ◽  
Mitsuhiro Hori ◽  
Takahide Sakagami ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Temperature Change ◽  
Motion Compensation ◽  
Thermoelastic Stress ◽  
Infrared Camera ◽  
Compensation System ◽  
Dissipated Energy ◽  
Thermoelastic Stress Analysis ◽  
Displacement Information ◽  
Synchronous Measurement

On the infrared thermography image, a false temperature change caused by the relative displacement between moving object and infrared camera is obtained. This paper shows the motion compensation system with the infrared-optical synchronous measurement. Displacement information of the specimen is calculated from the series of visible light image using the digital image correlation method (DIC). The displacement information on the visible image is reflected to the infrared image by the homography transformation. The random white pattern which can’t be detected by the infrared camera was drawn on the measured surface for DIC process. The developed motion compensation system was applied to the thermoelastic stress analysis and dissipated energy measurement. It was confirmed that a false temperature change and edge effect can be removed by using developed motion compensation system.

Simulation of Inspecting Stress Concentration with Thermoelastic Stress Analysis

2013 ◽  
Vol 405-408 ◽  
pp. 3143-3146 ◽  
Author(s):  
Lan Lin Zou
Keyword(s):  
Stress Concentration ◽  
Simulation Analysis ◽  
Thermoelastic Stress ◽  
Infrared Camera ◽  
Thermoelastic Stress Analysis ◽  
Temperature Changes ◽  
Sinusoidal Load ◽  
Simulation Results ◽  
The Right ◽  
Theory Calculation

The thermoelastic stress inspecting stress concentration was simulated using element plane223 of software ANSYS, comparing the result of simulation analysis and theory calculation, the simulation results of temperature and stress are precise extremely when the specimen is loaded sinusoidal load; the temperature changes of the right node in hole border is 0.305°C and the temperature changes of the bottom node in hole border is 0.098°C, the simulation results error comparing to the theory value are respectively 0.33% and 3.92%，which meets the real need. The temperature change value can be inspected with regular infrared camera, it will be a reliable method for inspecting and locating cracks in steel bridges.

Data Post-Processing for Above-Burden Infrared Camera (ABirC) System

2019 ◽  
Author(s):  
M. Walpole ◽  
C. Huang ◽  
F. Caplick ◽  
C. Andrade
Keyword(s):  
Infrared Camera ◽  
Post Processing

Thermoelastic Stress Analysis

1982 ◽  
Vol 29 (4) ◽  
pp. 555-563 ◽  
Author(s):  
L.R. Baker ◽  
J.M.B. Webber
Keyword(s):  
Stress Analysis ◽  
Thermoelastic Stress ◽  
Thermoelastic Stress Analysis

Thermoelastic stress analysis of a pultruded composite double lap joint

1999 ◽  
Author(s):  
John H. Hemann ◽  
Richard E. Martin ◽  
Davor G. Mandic
Keyword(s):  
Stress Analysis ◽  
Thermoelastic Stress ◽  
Thermoelastic Stress Analysis ◽  
Lap Joint

Femoral implants comparison by means of thermoelastic stress analysis

2006 ◽  
Vol 39 ◽  
pp. S515-S516
Author(s):  
E.M. Zanetti ◽  
S.S. Musso ◽  
A.L. Audenino
Keyword(s):  
Stress Analysis ◽  
Thermoelastic Stress ◽  
Thermoelastic Stress Analysis ◽  
Femoral Implants
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