Development and applications of thermoelastic stress analysis

Dulieu-Barton, J.M.; Stanley, P.

doi:10.1243/0309324981512841

Cited by 195 publications

(190 citation statements)

References 38 publications

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“…Three new peel stopper configurations are proposed. Thermoelastic stress analysis (TSA) [9] and finite element (FE) analysis are used to derive the crack-tip stress field and to characterise the fracture behaviour in the neighbourhood of the peel stopper to assess the conditions to achieve successful crack deflection.…”

Section: Introductionmentioning

confidence: 99%

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Fracture behaviour at tri-material junctions of crack stoppers in sandwich structures

Wang

Martakos

Dulieu-Barton

et al. 2015

Composite Structures

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Abstract:Inspired by a previously published peel stopper design for foam cored composite sandwich structures, three novel markedly lighter peel stoppers were evaluated with respect to their ability to deflect and arrest propagating face debond cracks. Of the three novel peel stopper configurations, C1, C2 and C3, C1 was similar to the previous design, whereas C2 and C3 were modified with layers of glass fibre fabric extending from the peel stopper tip into the face sheet (C2) or into the face sheet/core interface (C3). The previous peel stopper was validated under mode II dominated conditions, but the novel designs were investigated under mode I dominated crack propagation conditions, which are of higher practical relevance. Both quasi-static and fatigue loading scenarios were investigated. The mechanisms controlling crack propagation at the internal peel stopper tip were studied using Thermoelastic Stress analysis (TSA) and Finite Element (FE) analysis. The TSA has revealed significant new information about the local stress fields in the vicinity of the tri-material junction (peel stopper tip) as well as the fracture process zone. Configuration C1 was unable to deflect debond cracks consistently, albeit it did so in most cases, whereas it was incapable of achieving crack arrest. C2 and C3 both performed better in that they consistently demonstrated the ability to deflect propagating cracks, whereas only C2 could arrest the cracks consistently as well. Detailed fracture mechanics analyses confirmed and explained the experimental observations.

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Section: Introductionmentioning

confidence: 99%

“…For isentropic conditions, the temperature change (ΔT) divided by the absolute temperature (T) is linearly proportional to the change in the sum of principal stresses [9]. Therefore, TSA is used to determine the stress state in the neighborhood of the peel stopper and to assess the stress evolution during crack growth.…”

Section: Introductionmentioning

confidence: 99%

Fracture behaviour at tri-material junctions of crack stoppers in sandwich structures

Wang

Martakos

Dulieu-Barton

et al. 2015

Composite Structures

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“…TSA is a well-established stress analysis technique, see Dulieu-Barton and Stanley [1], based on the measurement of the small temperature change developed in a material as a result of elastic cyclic loading. The temperature change is directly proportional to the change in the sum of the principal surface stresses (∆(σ 1 + σ 2 )), see Stanley and Chan [2].…”

Section: Discussionmentioning

confidence: 99%

Thermoelastic Investigation of Damage Evolution in Small Stainless Steel Pipework

Quinn

Dulieu-Barton

Eaton-Evans

et al. 2007

Experimental Analysis of Nano and Engineering Materials and Structures

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SummaryIn this work thermoelastic stress analysis (TSA) is used to reveal information about the damage evolution process in small stainless steel pipework. TSA is a well-established stress analysis technique, see , based on the measurement of the small temperature change developed in a material as a result of elastic cyclic loading. The temperature change is directly proportional to the change in the sum of the principal surface stresses (∆(σ 1 + σ 2 )), see Stanley and Chan [2]. This relationship is usually sufficient for linear elastic, homogeneous problems, where the assumption is made that the temperature change is adiabatic.However, TSA has also been successfully used to detect and evaluate subsurface damage and flaws by , by considering information from thermoelastic data for a range of loading frequencies. In this work damage, in the form of semi-circular notches, was introduced into a flat aluminium plate and thermoelastic data was gathered from the undamaged side of the plate. Damage increases the stress gradient in a component and can lead to nonadiabatic behaviour. This non-adiabatic behaviour can be used to reveal the sub surface stresses, by considering the phase information from the thermoelastic signal [3]. In Ref.[3] different damage severities were considered and flaws only a quarter the way through the thickness of the 5.3 mm thick plate were revealed by the thermoelastic data. This illustrates the promise of TSA to assess subsurface damage and in the current work this is tested for a real industrial problem.The pipes under consideration were of cylindrical section and have an outside diameter of 3.175 mm and an inside diameter of 1.753 mm, i.e. a wall thickness of 0.711 mm. On assembly in service the material, 304L quarter hardened stainless steel (UNS S30400), is cold worked by bending around a former. During the product life cycle, maintenance is performed that requires the pipes to be straightened and then bent back to the original shape. To model this operation six specimens, with different deformation histories, of the stainless steel cylindrical section have been deformed to shape around a former identical to that used in the assembly process. The bent shape is illustrated in Fig. 1, along with the loading arrangement. The specimens were loaded in bending by applying cyclic compression through the loading blocks shown in Fig. 1. Only one loading block is shown, for clarity, the details are mirrored about the horizontal centreline. A

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“…A lock-in process is then used to compare the thermal response detected and the loading cycle, which produces a mean temperature signal, T, and a temperature change response, ΔT. The recorded thermal data may then be related to the change in the sum of the principal stresses, Δσ 11 +Δσ 22 , in an orthotropic material using [89]:…”

Section: Thermoelastic Stress Analysismentioning

confidence: 99%

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

Waugh

2016

Springer Theses

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Development and applications of thermoelastic stress analysis

Cited by 195 publications

References 38 publications

Fracture behaviour at tri-material junctions of crack stoppers in sandwich structures

Fracture behaviour at tri-material junctions of crack stoppers in sandwich structures

Thermoelastic Investigation of Damage Evolution in Small Stainless Steel Pipework

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

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