The Thermoelastic Constant

1987 ◽  
Author(s):  
A. S. Machin ◽  
J. G. Sparrow ◽  
M. G. Stimson
Keyword(s):  
Thermoelastic Constant

The Effect of Plastic Deformation on the Thermoelastic Constant and the Potential to Evaluate Residual Stress

2011 ◽  
Vol 70 ◽  
pp. 458-463 ◽  
Author(s):  
A. F. Robinson ◽  
Janice M. Dulieu-Barton ◽  
S. Quinn ◽  
R. L. Burguete
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Plastic Strain ◽  
Strain Hardening ◽  
Thermoelastic Stress ◽  
Paint Coating ◽  
Full Field ◽  
Thermoelastic Constant ◽  
Thermoelastic Response ◽  
Measured Change

In some metals it has been shown that the introduction of plastic deformation or strain modifies the thermoelastic constant, K. If it was possible to define the magnitude of the change in thermoelastic constant over a range of plastic strain, then the plastic strain that a material has experienced could be established based on a measured change in the thermoelastic constant. This variation of the thermoelastic constant and the ability to estimate the plastic strain that has been experienced, has potential to form the basis of a novel non-destructive, non-contact, full-field technique for residual stress assessment using thermoelastic stress analysis (TSA). Recent research has suggested that the change in thermoelastic constant is related to the material dislocation that occurs during strain hardening, and thus the change in K for a material that does not strain harden would be significantly less than for a material that does. In the work described in this paper, the change in thermoelastic constant for three materials (316L stainless steel, AA2024 and AA7085) with different strain hardening characteristics is investigated. As the change in thermoelastic response due to plastic strain is small, and metallic specimens require a paint coating for TSA, the effects of the paint coating and other test factors on the thermoelastic response have been considered.

On the Feasibility of Thermoelastic Stress Analysis on Rapid Prototyping Models

2006 ◽  
Vol 3-4 ◽  
pp. 355-362
Author(s):  
Giuseppe Carella ◽  
U. Galietti ◽  
D. Modugno
Keyword(s):  
Rapid Prototyping ◽  
Stress Analysis ◽  
Statistical Approach ◽  
Thermoelastic Stress ◽  
Testing Procedure ◽  
Load Cycle ◽  
Cycle Frequency ◽  
Standard Specimens ◽  
Thermoelastic Constant ◽  
Structural Tests

This work discusses application of the thermoelastic technique to the stress analysis of Rapid Prototyping (RP) models. The aim is to evaluate the possibility of conducting complete and effective structural tests on prototypes made by means of stereolithography (SLA). The analyzed material is an RP Cure 600 ND epoxy resin. A statistical approach was followed to evaluate the sensitivity of the thermoelastic behaviour of the material to some SLA characteristic parameters. In addition, the effect of load cycle frequency on thermoelastic signal was also analyzed. The experimental work included forty-eight tests on ASTM standardized specimens. A new testing procedure was developed for resin-made models. The new method is based on the application of a loading ramp to SLA standard specimens and on the acquisition of the infrared signal. The thermoelastic constant K is determined using the thermographic signal temporal slope. Results for an engine bracket are presented in the paper.

scholarly journals Thermoelastic investigation of residual stress: plastic deformation and the change in thermoelastic constant

2010 ◽  
Vol 6 ◽  
pp. 38016 ◽  
Author(s):  
A.F. Robinson ◽  
J.M. Dulieu-Barton ◽  
S. Quinn ◽  
R.L. Burguete
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Thermoelastic Constant

Thermoelastic constant or thermoelastic parameter?

1987 ◽  
Vol 48 (8) ◽  
pp. 749-753 ◽  
Author(s):  
A.K. Wong ◽  
R. Jones ◽  
J.G. Sparrow
Keyword(s):  
Thermoelastic Constant

Mean stress dependence of the thermoelastic constant

Strain ◽  
1987 ◽  
Vol 23 (1) ◽  
pp. 27-30 ◽  
Author(s):  
A. S. Machin ◽  
J. G. Sparrow ◽  
M. G. Stimson
Keyword(s):  
Mean Stress ◽  
Stress Dependence ◽  
Thermoelastic Constant

Thermoelastic constant determination of an interphase formed by a fibre—matrix interaction

1996 ◽  
Vol 27 (9) ◽  
pp. 743-747 ◽  
Author(s):  
K. Debray ◽  
J.F. Fromentin ◽  
Y. Lepetitcorps ◽  
E. Martin ◽  
J.M. Quenisset
Keyword(s):  
Matrix Interaction ◽  
Constant Determination ◽  
Thermoelastic Constant ◽  
Fibre Matrix
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