Derivation of the stress concentrations at holes in orthotropic plates using thermoelastic stress analysis


Quinn, S., Sambasivam, S. and Dulieu-Barton, J.M. (2009) Derivation of the stress concentrations at holes in orthotropic plates using thermoelastic stress analysis At SEM Annual Conference & Exposition on Experimental and Applied Mechanics - Experimental Mechanics of High Performance Systems. 07 - 09 Jun 2009. 10 pp.

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Description/Abstract

An experimental study of the stress distribution around holes in orthotropic composite laminates has been conducted using thermoelastic stress analysis (TSA). Quantitative thermoelastic studies of stress concentrations in metallic plates is a straightforward matter, all that is required is the ratio of the response from the hole and a far-field reading. For orthotropic materials the situation is more complex as the response is not simply proportional to the sum of the principal stresses. In general the thermoelastic response of an orthotropic laminate is a function of the stresses in the principal surface material directions and the associated coefficient of thermal expansion. The approach in this paper is to obtain ‘stress factors’ at the hole and identify the maxima in the plot. Specimens manufactured from a variety of different laminate lay-ups (unidirectional (UD), cross-ply (CP), angle-ply (AP) and quasi-isotropic (QI)) are considered. In all these cases the principal stress directions at the hole are not coincident with the principal material directions and it is a challenging proposition to derive meaningful stress data from these configurations. To validate the approach the experimental data are compared to analytical models. To better understand the nature of the response finite element models are produced that mimic the thermoelastic response.

Item Type: Conference or Workshop Item (Paper)
Venue - Dates: SEM Annual Conference & Exposition on Experimental and Applied Mechanics - Experimental Mechanics of High Performance Systems, 2009-06-07 - 2009-06-09
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Organisations: Fluid Structure Interactions Group
ePrint ID: 68654
Date :
Date Event
June 2009Published
Date Deposited: 14 Sep 2009
Last Modified: 18 Apr 2017 21:23
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/68654

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