A generalised approach to the calibration of orthotropic materials for thermoelastic stress analysis

Emery, T.R.; Dulieu-Barton, J.M.; Earl, J.S.; Cunningham, Paul

doi:10.1016/j.compscitech.2007.09.002

Cited by 68 publications

(80 citation statements)

References 27 publications

(48 reference statements)

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“…The thermoelastic signal is induced in the isotropic surface layer of the material, on conditions that the loading frequency is high enough to ensure quasi-adiabatic conditions for the temperature change and that an isotropic surface layer of sufficient thickness exists [8].…”

Section: Calibration Of the Thermoelastic Signal Of Pa6 Gf30mentioning

confidence: 99%

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Identification of the critical load for cyclic loading of shortfibre reinforced PA6 GF30 by a quantitative analysis of the thermoelastic response

Klavzar

Renz

2010

EPJ Web of Conferences

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Abstract. In TSA the thermoelastic temperature change in the surface of cyclically loaded materials is measured, which is for isotropic materials proportional to the change of the sum of the principal stresses. The sensitivity of the infrared sensors used in TSA is related non-linearly with the absolute temperature. This can be effectively corrected by a direct calibration of the thermal signal, if this is not done by the supplier of the measurement system. The injection moulded PA6 GF 30 has layer-wise changing mechanical and thermoelastic properties. Therefore is a strain oriented approach used to calibrate the thermoelastic signal, the measured thermoelastic signal can be directly related to the sum of the principal strains. In a load increase test the thermoelastic signal increases proportional to the applied load up to a certain load-level. Beyond this load, the thermoelastic signal S increases disproportionately high compared to the applied load. The increase of the thermoelastic signal is caused by the beginning disruption of the material, what is confirmed by measuring the acoustic emission. Single-load fatigue measurements are done, indicating that the maximum applicable load under cyclic loading conditions could be determined from the thermoelastic signal.

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Section: Calibration Of the Thermoelastic Signal Of Pa6 Gf30mentioning

confidence: 99%

“…In the strain oriented approach, the measured thermoelastic signal is not calibrated against the sum of the principal stresses in the surface layer of the material, but against the sum of the principal strains, according to equation 2 [5,8]:…”

Section: Calibration Of the Thermoelastic Signal Of Pa6 Gf30mentioning

confidence: 99%

Identification of the critical load for cyclic loading of shortfibre reinforced PA6 GF30 by a quantitative analysis of the thermoelastic response

Klavzar

Renz

2010

EPJ Web of Conferences

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“…The surface resin thickness variation of this material was less than the RI material (20 to 40 µm). The composite material used for the OC test specimens is described in detail in [4] and comprised 13 layers of a unidirectional E-glass/epoxy (SE84) pre-impregnated material. The material was consolidated under vacuum pressure for one hour and then cured for four hours at a temperature of 80 ºC, resulting in a laminate that was 3.5 mm thick with an average resin surface layer thickness of 29 µm.…”

Section: Test Specimen Manufacture and Materials Propertiesmentioning

confidence: 99%

“…The three materials are liquid resin infused (RI) glass mat, autoclave consolidated (AC) glass/epoxy prepreg and oven consolidated (OC) glass/epoxy prepreg. The results presented for the OC material is from earlier work by the authors [4]. Three different epoxy resins are used in the materials, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Material Properties for Quantitative Thermoelastic Stress Analysis of Composite Structures

Fruhmann

Sambasivam

Dulieu-Barton

et al. 2008

AMM

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Abstract. The sensitivity of the thermoelastic response to variations in the fibre volume fraction, resin material and manufacturing route is assessed. To quantify any effects a comprehensive materials testing programme has been conducted to obtain coefficients of thermal expansion, specific heat, density and the elastic properties, which is described in detail in the paper. The work is focused on attempting to ascertain if the source of the response is from the isotropic resin rich layer or from the orthotropic substrate. It is also demonstrated that small variations in material properties can have a significant effect on the calculated thermoelastic response.

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Composite Materials for Marine Applications: Key Challenges for the Future

Shenoi

Dulieu-Barton

Quinn

et al. 2011

Composite Materials

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A generalised approach to the calibration of orthotropic materials for thermoelastic stress analysis

Cited by 68 publications

References 27 publications

Identification of the critical load for cyclic loading of shortfibre reinforced PA6 GF30 by a quantitative analysis of the thermoelastic response

Identification of the critical load for cyclic loading of shortfibre reinforced PA6 GF30 by a quantitative analysis of the thermoelastic response

Material Properties for Quantitative Thermoelastic Stress Analysis of Composite Structures

Composite Materials for Marine Applications: Key Challenges for the Future

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