Applicability of critical stress intensity factor (K,) and/or critical crack tip opening displacement (CTODA for epoxy and polyester polymer composites (PC) in mode I fracture are investigated. Both unreinforced and glass fiber reinforced polymer composite systems are studied using single edge notch
Prediction of crack tip opening displacement of fibre composites
β Scribed by V.K Srivastava
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 293 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0013-7944
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β¦ Synopsis
The fracture behaviour of single edge notched unidirectional glass fibre reinforced epoxy resin composites under tensile loading was investigated. Loadelongation curves were obtained for crack length varying from 4, 6, 8, 10 and 12mm and different fibre volume fractions of 0.48, 0.502 and 0.525. The results show that the fracture strength and fracture toughness are dependent on the crack length. Crack tip opening displacement (CTOD) can be estimated with the use of fracture toughness in mode-I.
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Further resuhs given in the present paper confnm that shallow cracks have larger crack tip opening disp~a~en~ at initiation than deep cracks. This difference in behaviour is shown to be principally caused by the different hydrostatic stresses existing at the tips of shallow and deep cracks. A new me
Critical values of the crack-tip-opening displacement, COD,, are determined on CIIspecimens having different thicknesses and ligament lengths. COD, is determined using the method of stereophotogrammetry with the scanning-electron microscope. The in&nce of specimen geometry on CODi is studied. Criter
The experimental results show that (I) X, of two thin sheet aluminum alloys are valid; they\_ are I?, = 201.39 kg/mm"\* and l?,, = 208.31 kg/mm"2 of Lyl22c2(1), K, =226.18kg/mm"2 and K,,= 234.55 kg/mm3" of Lc4 -cs; (2) the R-curves of the four thin sheet aluminum alloys are independent of the initia
Al&r&-The relationship between J-integral and crack opening displacement 8 is based on theoretical as well as experimental investigations and is of the general form I = MO,& The significance of M and its possible dependence on specimen geometry and material properties is unknown. An attempt is made