The notched strength and unstable fracture criterion in plain woven glass/epoxy composites with a crack for transport
- Tokai Univ., Tokyo (Japan)
- Hanyang Univ., Seoul (Korea, Republic of)
The fracture behavior of plain woven glass/epoxy composite plates with a notch is investigated under static tensile loading. It is shown in this paper that the characteristic length associated with the point stress criterion depends on the crack length. To predict the notched tensile strength, the point stress criterion proposed by Whitney and Nuismer (1974) are modified. The condition of unstable crack growth in the presence of a pre-existing flaw (machined notch) is examined by means of the maximum stress intensity factor K{sub max} using maximum load P{sub max}. The values of K{sub max} evaluated from energy release rate G{sub max} (the compliance method) and the standard expression normally used for isotropic materials (the isotropic method) indicate a wide difference. Therefore, in regard to anisotropy and heterogeneity of the composite materials studied, the modified shape correction factor f* (a/w) is obtained, K{sub max} evaluated by the compliance method a little or insignificantly depends on the initial crack length a, the specimen thickness B, the crack angle 0 and the specimen geometry.
- OSTI ID:
- 109712
- Report Number(s):
- CONF-950521-; ISBN 1-56676-313-4; TRN: IM9543%%13
- Resource Relation:
- Conference: ENERCOMP 95: international conference on composite materials and energy, Montreal (Canada), 8-10 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of International conference on composite materials and energy: Proceedings. Enercomp 95; PB: 1080 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strength in notched and impact-damaged laminates
Comparison of woven and stitched out-of-autoclave E-glass/epoxy composites subjected to quasi-static and cyclic tensile loads