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Trends in Applied Sciences Research
  Year: 2006 | Volume: 1 | Issue: 2 | Page No.: 144-154
DOI: 10.3923/tasr.2006.144.154
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Evaluation of Carbon/Epoxy Delamination Fracture Toughness
K.G. Muthurajan, K. Sankaranarayanasamy , S.B. Tiwari and B. Nageswara Rao

Delamination is one of the most commonly observed failure modes in laminated composites. The existence of a delamination in a structure can significantly reduce the stiffness and strength of the structure. Various types of cracked specimens were designed to quantify the effect of delaminations in composites. The growth of delamination in composite structures starts when the strain energy release rate (G) under service loads exceeds the fracture energy (Gc). The measurement of fracture toughness of a material relies strongly on the method of data interpretation. In the original form, the experimental fracture data normally consists of a load-displacement record for a cracked specimen. Data reduction requires the knowledge of the specimen crack length and dimensions and a suitable method for calculating the fracture parameters. This study presents a simple and reliable procedure for the evaluation of mode I and mode II delamination fracture toughness from the test data of Double Cantilever Beam (DCB) specimens and Cracked-Lap Shear (CLS) specimens made of carbon/epoxy. Critical load estimation of DCB specimens from the measured specific fracture energy (GIC) of the materials is found to be in good agreement with test results.
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How to cite this article:

K.G. Muthurajan, K. Sankaranarayanasamy , S.B. Tiwari and B. Nageswara Rao , 2006. Evaluation of Carbon/Epoxy Delamination Fracture Toughness. Trends in Applied Sciences Research, 1: 144-154.

DOI: 10.3923/tasr.2006.144.154








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