Delamination tolerance studies in laminated composite panels |
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Authors: | K L Singh B Dattaguru T S Ramamurthy P D Mangalgiri |
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Affiliation: | (1) Department of Aerospace Engineering, Indian Institute of Science, 560 012 Bangalore, India;(2) Aeronautical Development Agency, PB No. 1718, Vimanapura Post, 560 017 Bangalore, India |
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Abstract: | Determination of levels of tolerance in delaminated composite panels is an important issue in composite structures technology.
The primary intention is to analyse delaminated composite panels and estimate Strain Energy Release Rate (SERR) parameters
at the delamination front to feed into acceptability criteria. Large deformation analysis is necessary to cater for excessive
rotational deformations in the delaminated sublaminate. Modified Virtual Crack Closure Integral (MVCCI) is used to estimate
all the three SERR components at the delamination front from the finite element output containing displacements, strains and
stresses. The applied loading conditions are particularly critical and compressive loading on the panel could lead to buckling
of the delaminated sublaminate and consequent growth of delamination. Numerical results are presented for circular delamination
of various sizes and delamination at various interfaces (varying depth-wise location) between the base- and the sub-laminates.
Numerical data are also presented on the effect of bi-axial loading and in particular on compressive loading in both directions.
The results can be used to estimate delamination tolerance at various depths (or at various interfaces) in the laminate. |
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Keywords: | Delamination modified virtual crack closure integral strain energy release rate |
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