Thermoelastic Stress Analysis

Greene, Richard; Patterson, E. A.; Rowlands, R. E.

doi:10.1007/978-0-387-30877-7_26

Cited by 72 publications

(65 citation statements)

References 91 publications

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“…The thermoelastic effect is defined as the change in temperature at a point on a body due to its elastic deformation under adiabatic conditions. The thermoelastic effect was reported by Weber in 1830 and its associated theory was published by Lord Kelvin in 1853 [1][2][3].…”

Section: Tsamentioning

confidence: 95%

“…(1) using a material constant K, defined as K = α/ρ·c σ . The K values for structural materials are given in Table 1 [2]. This table also gives resolution indications for determining Δσ values, depending on the ΔT measurement resolution for the listed materials.…”

Section: Tsamentioning

confidence: 99%

“…. [2][3][4][5][6][7][8][9]. Recent research programs have also aimed at developing and using lower cost equipment for TSA applications [8].…”

Section: Tsamentioning

confidence: 99%

“…Prior calibration of the 316L stainless steel used in the experiment furnished a thermoelastic constant K = 4.04 × 10 -12 Pa -1 to be used in Eq. (2).…”

Section: Tsa Analysis Of a Cracked T-joint Specimenmentioning

confidence: 99%

“…The thermoelastic response of composite materials is not simply proportional to the change of the stress invariant, but TSA can be an important tool to indicate damage areas in composite specimens even if these areas are located beneath the observed surface [2].…”

Section: Inspection Of a Composite Thick Slab With Delamination Defectsmentioning

confidence: 99%

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Using Thermoelastic Stress Analysis to Detect Damaged and Hot Spot Areas in Structural Components

Freire¹,

Waugh²,

Fruehmann³

et al. 2015

JMEA

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This paper discusses the suitability of using TSA (thermoelastic stress analysis) as an advanced tool to detect damaged areas and highly stressed (hot spot) areas in structural components. Such components can be, for example, parts of large structural panels built of welded metallic or composite materials. Besides detecting hot spot areas, it is expected that stresses in these areas can be suitably quantified and processed in order to predict crack initiation and propagation due to in-service loads. The paper starts with references to selected review and application articles on the subject. Two simple laboratory experiments are presented which illustrate the quality of the results that can be achieved using TSA. In the first experiment, a stainless steel T-joint designed to model a welded structural component is analysed. The T-joint had a machine-notched crack-like flaw close to the component's weld toe. The qualitative and quantitative experimental results determined along four specified areas of the T-joint model showed that TSA can indeed be used as a tool to detect loaded cracks and hot spots in large metallic structures, and that stresses can be accurately evaluated. In the second experiment, a prismatic bar made of CFRE (carbon fibre-reinforced-epoxy) was tested to locate three subsurface areas of damage introduced beforehand into the component. Two of these inside damaged areas were detected to be 3.1 mm and 7.1 mm from the observed surface. The positive results achieved with the two lab experiments, along with a review of the selected research publications, indicate that TSA application can be extended to the real-world field of structural components. Topics to be addressed in this research field should have to do with components that work under random or quasi-cyclic service loading, problems where adiabatic conditions do not prevail, and reduction of the cost of infra-red cameras.

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Section: Tsamentioning

confidence: 95%

Section: Tsamentioning

confidence: 99%

“…. [2][3][4][5][6][7][8][9]. Recent research programs have also aimed at developing and using lower cost equipment for TSA applications [8].…”

Section: Tsamentioning

confidence: 99%

“…Prior calibration of the 316L stainless steel used in the experiment furnished a thermoelastic constant K = 4.04 × 10 -12 Pa -1 to be used in Eq. (2).…”

Section: Tsa Analysis Of a Cracked T-joint Specimenmentioning

confidence: 99%

Section: Inspection Of a Composite Thick Slab With Delamination Defectsmentioning

confidence: 99%

See 3 more Smart Citations

Using Thermoelastic Stress Analysis to Detect Damaged and Hot Spot Areas in Structural Components

Freire¹,

Waugh²,

Fruehmann³

et al. 2015

JMEA

View full text Add to dashboard Cite

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ESPI Photoelastic Measurement of All In-Plane Stress Components

Gao

Schajer

2012

Conference Proceedings of the Society for Experimental Mechanics Series

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A photoelastic stress measurement method is described for evaluating all three in-plane stress components within a two-dimensional photoelastic material. The measurement method is based on the observation that the complex transmission factors that describe the optical attenuation and phase changes due to stress-induced birefringence have a second order tensor character similar to that of other tensor quantities such as stress and strain. Thus, the conventional transformation equations and Mohr's circle construction can be applied to the rotation of optical axis. The method involves loading a photoelastic specimen within a Michelson interferometer and using Electronic Speckle Pattern Interferometry (ESPI) to measure the complex transmission factors corresponding illumination in four different polarization directions. These measurements create the conceptual equivalent of a strain-gauge rosette at each pixel within the measured images. A complex Mohr's circle can then be constructed at each pixel within the measured area, from which the principal transmission factors and principal axis orientation can be determined. In turn, these results provide the associated principal stresses and corresponding angles throughout the photoelastic specimen. The effectiveness of the proposed technique is demonstrated by comparing experimental and analytical results for a circular ring under diametral load.

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