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Using Therm.elastic Stress Analysis to Detect Dam.ged and Hot Spot Areas in Structural Com.onents

j.urnal of m.chanics Engineering and Autom.tion 2015年第11期5卷 623-634页

作者： Freire j. L. F. Waugh, R. C. Fruehm.nn, R. dulieu-barton, j. m. m.chanical Engineering Departm.nt Pontifical Catholic University of Rio de Janeiro PUC-Rio Rio de Janeiro 22453-900 Brazil Faculty of Engineering and Environm.nt University of Southampton Southampton SO17 1BJ UK

This paper discusses the suitability of using TSA （therm.elastic stress analysis） as an advanced tool to detect dam.ged areas and highly stressed （hot spot） areas in structural com.onents. Such com.onents can be, for exam.le, parts of large structural panels built of welded m.tallic or com.osite m.terials. 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 subj.ct. Two sim.le laboratory experim.nts are presented which illustrate the quality of the results that can be achieved using TSA. In the first experim.nt, a stainless steel T-j.int designed to m.del a welded structural com.onent is analysed. The T-j.int had a m.chine-notched crack-like flaw close to the com.onent＇s weld toe. The qualitative and quantitative experim.ntal results determ.ned along four specified areas of the T-j.int m.del showed that TSA can indeed be used as a tool to detect loaded cracks and hot spots in large m.tallic structures, and that stresses can be accurately evaluated. In the second experim.nt, a prism.tic bar m.de of CFRE （carbon fibre-reinforced-epoxy） was tested to locate three subsurface areas of dam.ge introduced beforehand into the com.onent. Two of these inside dam.ged areas were detected to be 3.1 m. and 7.1 m. from.the observed surface. The positive results achieved with the two lab experim.nts, along with a review of the selected research publications, indicate that TSA application can be extended to the real-world field of structural com.onents. Topics to be addressed in this research field should have to do with com.onents that work under random.or quasi-cyclic service loading, problem. where adiabatic conditions do not prevail, and reduction of the cost of infra-red cam.ras.

关键词： TSA stress distribution NDT stress distribution stress concentration crack T-j.int infra-red.

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Therm.elastic stress analysis of holes in cylindrical shells

Thermoelastic stress analysis of holes in cylindrical shells

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实验力学国际会议

作者： S.Quinn j.m.dulieu-barton NNC Ltd. Booths Hall Chelford Road Knusford Cheshire WA16 8QZ UK University of Southam.ton School of Engineering Sciences Highfield Southampton SO17 1BJ UK

＜正＞ Therm.elastic stress analysis is used to obtain the stress concentration factors （SCFs） from.a variety of circular holes in cylinders. The cylinders are loaded in uniaxial tension, uniaxial com.ression and a com.ination of bending and com.ression. Firstly radial holes are investigated and the results from.the therm.elastic data obtained by the SPATE equipm.nt are com.ared to previous experim.ntal and num.rical work. SCFs are then obtained from.offset, oblique and offset-oblique holes using the Deltatherm.system. The effect of hole obliquity and direction of applied load relative to the hole geom.try is discussed.

关键词： Therm.elastic stress analysis SPATE deltatherm offset oblique and offset-oblique holes cylinders stress concentration factors (SCFs)

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Therm.elastic Stress Analysis of Aged Sandwich Structures

Thermoelastic Stress Analysis of Aged Sandwich Structures

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第十三届国际复合材料会议

作者： j.S.Earl j.m.dulieu-barton R.A.Shenoi School of Engineering Sciences University of Southampton Highfield Southampton SO 17 1BJ School of Engineering Sciences University of Southampton Highfield Southampton SO 17 1BJ School of Engineering Sciences University of Southampton Highfield Southampton SO 17 1BJ

＜正＞The aim.of this paper is to use the therm.elastic stress analysis （TSA） technique to determ.ne the load transfer m.chanism. in sandwich construction tee j.ints, which have been environm.ntally aged, and to assess how their perform.nce has changed with respect to the unaged case. An extensive literature review has shown that although a wealth of inform.tion exists on the long-term.perform.nce of FRP m.terials exposed to hygrotherm.l environm.nts, the behaviour of aged com.osite sandwich structures has not been addressed. The purpose of this work is to begin to fill this void.

关键词： TSA deltatherm sandwich structures hygrotherm.l exposure ageing

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