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Source: STP36482S
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A method is presented for estimating the stress intensity factor characteristic of crack extension in a specially orthotropic advanced fiber composite laminate, based on the elastic properties and ultimate principal strengths of a lamina, the laminate construction, and the experimentally determined value of the characteristic stress intensity factor of an arbitrary angle-plied, midplane symmetric laminate. A comparison of the results obtained from this method with limited experimental data for graphite/epoxy laminates indicates that the method is quite accurate for this particular material system.
The predictive method is also used, in conjunction with experimental data, to estimate the size of a damage zone surrounding the crack tip. The implications of the size of this damage zone are discussed briefly.
Keywords:
composite materials, laminates, fibers, fracture strength, stresses, crack propagation, fracture tests
Author Information:
Konish, HJ
Graduate student and associate professors, Carnegie Institute of Technology, Carnegie-Mellon University, Pittsburgh, Pa.
Cruse, TA
Graduate student and associate professors, Carnegie Institute of Technology, Carnegie-Mellon University, Pittsburgh, Pa.
Swedlow, JL
Graduate student and associate professors, Carnegie Institute of Technology, Carnegie-Mellon University, Pittsburgh, Pa.
Committee/Subcommittee: D30.04
DOI: 10.1520/STP36482S