The application of thermoelastic stress analysis techniques to composite materials

1988 ◽  
Vol 23 (3) ◽  
pp. 137-143 ◽  
Author(s):  
P Stanley ◽  
W K Chan
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Stress Analysis ◽  
Thermoelastic Stress ◽  
Orthotropic Materials ◽  
Quantitative Interpretation ◽  
Thermoelastic Stress Analysis ◽  
Relevant Theory ◽  
Analysis Techniques ◽  
Thermoelastic Response

The application of the thermoelastic technique (SPATE) to two different composite material specimens is described and the results are critically discussed. The relevant theory, which permits a quantitative interpretation of the thermoelastic response from orthotropic materials, is outlined.

Damage Analysis of Internal Surface Flaws Using Thermoelastic Stress Analysis

2005 ◽  
Vol 293-294 ◽  
pp. 279-288 ◽  
Author(s):  
N. Sathon ◽  
Janice M. Dulieu-Barton
Keyword(s):  
Heat Conduction ◽  
Stress Analysis ◽  
Phase Variation ◽  
Thermoelastic Stress ◽  
Internal Surface ◽  
Thermoelastic Stress Analysis ◽  
Element Simulation ◽  
Surface Flaws ◽  
Thermoelastic Response ◽  
Phase Data

Thermoelastic Stress Analysis (TSA) has been used to detect and evaluate the severity of damage on a flat metallic plate. The damage takes the form of a semi-circular notch that represents a surface flaw. Thermoelastic data was gathered from the undamaged side of the plate. The experimental results show that shallow surface flaws can be detected by using phase information from thermoelastic data. This information can then be used to indicate the flaw severity in terms of the notch depth. It is shown that the phase data is dependent on the heat conduction effects around the notch, which enable an assessment of the damage. This is modelled using a simple finite element simulation of the effects of heat conduction on the thermoelastic response. A discussion on the potential of using phase variation across damaged regions to analyse damage severity is provided.

A New Approach to Stress Analysis of Vascular Devices Using High Resolution Thermoelastic Stress Analysis

2006 ◽  
Vol 5-6 ◽  
pp. 63-70 ◽  
Author(s):  
James Eaton-Evans ◽  
Janice M. Dulieu-Barton ◽  
Edward G. Little ◽  
Ian A. Brown
Keyword(s):  
High Resolution ◽  
Stress Analysis ◽  
Medical Devices ◽  
Thermoelastic Stress ◽  
Thermoelastic Stress Analysis ◽  
New Approach ◽  
Full Field ◽  
Vascular Stents ◽  
Thermoelastic Response ◽  
Quantitative Stress

Thermoelastic Stress Analysis (TSA) is a non-contacting technique that provides full field stress information and can record high-resolution measurements from small structures. The work presented in this paper summarises the application of TSA to two types of small medical devices that are used to treat diseased arteries; angioplasty balloons and vascular stents. The use of high resolution optics is described along with a calibration methodology that allows quantitative stress measurements to be taken from the balloon structure. A brief account of a study undertaken to characterise the thermoelastic response from Nitinol is also included and it is demonstrated that thermoelastic data can be obtained from a stent at high resolutions.

Thermoelastic Stress Analysis of Nitinol Self-Expanding Stents

2006 ◽  
Vol 3-4 ◽  
pp. 47-52 ◽  
Author(s):  
James Eaton-Evans ◽  
Janice M. Dulieu-Barton ◽  
Edward G. Little ◽  
Ian A. Brown
Keyword(s):  
Stress Analysis ◽  
Medical Devices ◽  
Thermoelastic Stress ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Thermoelastic Stress Analysis ◽  
Mesh Structure ◽  
Fine Mesh ◽  
Nitinol Stents ◽  
Thermoelastic Response

Self-expanding stents are small medical devices used to treat vascular disease and are typically fabricated from a super-elastic, shape memory alloy known as Nitinol and have a fine mesh structure. This paper describes preliminary work on the application of Thermoelastic Stress Analysis (TSA) to Nitinol stents. Uniaxial tensile tests were conducted on thin tubes of Nitinol to characterise the material mechanical properties. TSA calibration exercises were conducted, which showed that Nitinol exhibits a non-uniform thermoelastic response through its elastic region that corresponded to the superelastic behaviour. Initial TSA demonstrated that a viable thermoelastic signal could be obtained from the stents. In high resolution tests the effect of motion and noise were considerable but it was still possible to obtain a readable thermoelastic signal.

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