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Determining orthotropic coefficients from, and thermoelastic stress analysis of, diametrically loaded composite disk

Determining orthotropic coefficients from, and thermoelastic stress analysis of, diametrically loaded composite disk
Determining orthotropic coefficients from, and thermoelastic stress analysis of, diametrically loaded composite disk
Thermoelastic stress analysis measures temperature variations in loaded solids and relates these to associated stresses. For orthotropic materials, the measured signal is proportional to a linear combination of the normal stress changes in the directions of material symmetry, and K1 and K2 are thermo-mechanical coefficients. Quantitative thermoelastic stress analysis of orthotropic composites necessitates (i) determination of the above two thermo-mechanical coefficients (i.e. calibration), and (ii) separation of the stresses. Although calibration procedures can take different forms, K1 and K2 can be experimentally determined most reliably and easily from calibration specimens of the same material, paint coating, loading frequency and ambient conditions as the test structure. Such calibration specimens typically employ a geometry and loading for which the state of stress or strain is known theoretically, or independently determined. Loaded beams, a diametrically-compressed disk, or uniaxial tensile coupons have been used for isotropic materials. Orthotropic materials usually necessitate testing two calibration specimens, with their principal material directions interchanged respectively. The present paper demonstrates the ability to determine both K1 and K2 from a single diametrally-loaded orthotropic composite (graphite/epoxy) disk. To be able to determine both coefficients from a single calibration specimen is advantageous. Disks are also easy to machine and load, rendering them very convenient for calibration.
Quinn, Simon
0805cab8-0ef5-4f65-9ed6-25fd5563d1a6
Lin, Shiang-Jiun
728086c1-9e22-4a5f-9c91-20051233ee8b
McCabe, Jonathan
b6c1f2f0-29d6-4719-b83c-fa54cfdb509f
Rowlands, Robert E.
223193cb-99b4-4238-9344-af6762acc936
Quinn, Simon
0805cab8-0ef5-4f65-9ed6-25fd5563d1a6
Lin, Shiang-Jiun
728086c1-9e22-4a5f-9c91-20051233ee8b
McCabe, Jonathan
b6c1f2f0-29d6-4719-b83c-fa54cfdb509f
Rowlands, Robert E.
223193cb-99b4-4238-9344-af6762acc936

Quinn, Simon, Lin, Shiang-Jiun, McCabe, Jonathan and Rowlands, Robert E. (2006) Determining orthotropic coefficients from, and thermoelastic stress analysis of, diametrically loaded composite disk. ASME International Mechanical Engineering Congress and Exposition (IMECE 06), Chicago, USA. 05 - 10 Nov 2006. 6 pp .

Record type: Conference or Workshop Item (Poster)

Abstract

Thermoelastic stress analysis measures temperature variations in loaded solids and relates these to associated stresses. For orthotropic materials, the measured signal is proportional to a linear combination of the normal stress changes in the directions of material symmetry, and K1 and K2 are thermo-mechanical coefficients. Quantitative thermoelastic stress analysis of orthotropic composites necessitates (i) determination of the above two thermo-mechanical coefficients (i.e. calibration), and (ii) separation of the stresses. Although calibration procedures can take different forms, K1 and K2 can be experimentally determined most reliably and easily from calibration specimens of the same material, paint coating, loading frequency and ambient conditions as the test structure. Such calibration specimens typically employ a geometry and loading for which the state of stress or strain is known theoretically, or independently determined. Loaded beams, a diametrically-compressed disk, or uniaxial tensile coupons have been used for isotropic materials. Orthotropic materials usually necessitate testing two calibration specimens, with their principal material directions interchanged respectively. The present paper demonstrates the ability to determine both K1 and K2 from a single diametrally-loaded orthotropic composite (graphite/epoxy) disk. To be able to determine both coefficients from a single calibration specimen is advantageous. Disks are also easy to machine and load, rendering them very convenient for calibration.

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More information

Submitted date: 14 August 2006
Published date: 5 November 2006
Venue - Dates: ASME International Mechanical Engineering Congress and Exposition (IMECE 06), Chicago, USA, 2006-11-05 - 2006-11-10
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 48734
URI: http://eprints.soton.ac.uk/id/eprint/48734
PURE UUID: ecd0c524-dc36-483f-9971-e6d99ce52d33
ORCID for Simon Quinn: ORCID iD orcid.org/0000-0002-9727-5080

Catalogue record

Date deposited: 10 Oct 2007
Last modified: 09 Jan 2022 03:14

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Contributors

Author: Simon Quinn ORCID iD
Author: Shiang-Jiun Lin
Author: Jonathan McCabe
Author: Robert E. Rowlands

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