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RESEARCH PRODUCT
Finite fracture mechanics analysis of crack onset at a stress concentration in a UD glass/epoxy composite in off-axis tension
Janis AndersonsE. SpārniņšS. Tarasovssubject
Stress (mechanics)Materials scienceFracture toughnessDamage mechanicsUltimate tensile strengthGeneral EngineeringCeramics and CompositesFracture mechanicsComposite materialStrength of materialsStress intensity factorStress concentrationdescription
The presence of stress concentrations at holes and notches is known to reduce the strength of composite materials. Due to complexity of the damage processes at a stress raiser in a composite, different modeling approaches have been developed, ranging from empirical point and average stress criteria to involved damage mechanics or cohesive zone-based models of failure. Finite fracture mechanics approach with a coupled stress and energy failure criterion, recently developed and applied mainly to cracking in homogeneous isotropic materials, allows predicting the appearance and propagation of a crack using material strength and toughness characteristics obtained from independent tests. The present study concerns application of the finite fracture mechanics to the analysis of cracking at a notch in a UD glass/epoxy composite subjected to tensile off-axis loading. Based on UD composite strength and intralaminar toughness characterized by separate tests, finite fracture mechanics analysis provided conservative estimates of crack onset stress at the notch.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-09-01 | Composites Science and Technology |