Damage Models for Delamination and Transverse Fracture in Fibrous Composites.
Abstract
Theoretical and experimental work on the deformation and fracture of fibrous composites with distributed damage is described. Emphasis is on establishing the existence of potentials analogous to strain energy and on using these so-called work potentials in fracture studies. The difference between changing damage and constant damage processes is accounted for by using multivalued work potentials. It was shown previously that these potentials lead to a path independent J integral for characterizing fracture. A recent study is described in which the J integral is used to determine fracture energy for delamination in double-cantilevered beam specimens with a large percentage of off-axis fibers; the results are compared with fracture energies found by standard methods (which to not account for effects of distributed damage). Discussed next are investigations of flat rectangular bar specimens and thin-walled tubes under axial and Lorsional loading. The limited amount of experimental data presently available on angle-ply laminates confirms the existence of a potential even when there are large increases in microcracking. The Appendix contains copies of technical reports prepared during the project year and the abstract of a recently completed Ph.D. dissertation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1986
- Accession Number
- ADA174661
Entities
People
- M. J. Lamborn
- R. A. Schapery
- R. D. Tonda
Organizations
- Texas A&M University