J integral as fracture criterion for short fibre composites: An experimental approach
✍ Scribed by B.D Agarwal; B.S Patro; Prashant Kumar
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 851 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Fracture behaviour of randomly oriented short glass fibre reinforced epoxy resin has been investigated. Fracture tests were conducted on single edge notched specimens and J integral evaluated using energy rate interpretation. Its value is found to be independent of crack length when crack length to specimen width ratio (a/w) is larger than 0.35. For smaller cracks, general material damage away from the crack tip also influences the energy absorbed significantly. An extrapolation method has been developed to separate the crack tip energy from the energy absorbed due to general material damage. The J integral thus obtained is independent of crack length and specimen length and its critical value is the same as obtained for a/w >0.35 without extrapolation. It also agrees well with the critical stress intensity factor obtained using R-curve approach in an earlier study. Approp~ate modelljng of the stress-strain curve and observations on damage mode also justify the use of J integral to characterize fracture of short fibre composites.