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A two-level, linear, semiempirical theory for a failure criterion is described. The theory predicts the strength behavior of unidirectional filamentary composites under uniaxial and combined stress from basic constituent material properties and fabrication process considerations. Application of the theory to several filament-nonmetallic matrix composites are presented, and comparisons are made with experimental data. These results show good agreement between theory and experiment. Simple and combined strength envelopes are generated to illustrate the versatility of the theory and to point up problem areas in experimental work and design.
fiber composites, failure criteria, design, unidirectional, uniaxial load, combined stress, strength behavior, evaluation, tests
Chamis, C. C.
Aerospace engineer, National Aeronautics and Space Administration, Cleveland, Ohio