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. In, SEM Annual Conference & Exposition on Experimental and Applied Mechanics - Experimental Mechanics of High Performance Systems, Albuquerque, USA, 07 - 09 Jun 2009. Bethel, Connecticut, Society for Experimental Mechanics10pp.

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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)
Related URLs:
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Fluid-Structure Interactions
ePrint ID: 68654
Date Deposited: 14 Sep 2009
Last Modified: 28 Mar 2014 15:11
Projects:
Application of Thermoelastic Stress Analysis as a design tool for the assessment of complex composite components
Funded by: EPSRC (EP/D037271/1)
Led by: Simon Quinn
2 May 2006 to 1 May 2009
URI: http://eprints.soton.ac.uk/id/eprint/68654

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