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Mode number | Fiber failure criteria | Event description |
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1 | Longitudinal tensile () | Failure of ply controlled by fiber tensile strength and fiber volume ratio |
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2 | Longitudinal compressive () | (1) Fiber/matrix delamination under compression loading |
(2) Fiber microbuckling |
(3) Fiber crushing |
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3 | Transverse tensile | Matrix cracking under tensile loading, event controlled by matrix tensile strength, matrix modulus, and fiber volume ratio |
Transverse compressive | Matrix cracking under compressive loading, event controlled by matrix compressive strength, matrix modulus, and fiber volume ratio |
Normal tensile () | Plies are separating due to normal tension |
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4 | Normal compressive () | Due to very high surface pressure that is crushing of laminate |
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5 | In-plane shear () | Failure in-plane shear relative to laminate |
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6 | Transverse normal shear () | Shear failure acting on transverse cross-oriented in a normal direction of the ply |
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7 | Longitudinal normal shear () | Shear failure on longitudinal cross section that is oriented in a normal direction of ply |
Normal tensile () | Combined stress failure criteria used for isotropic materials |
Relative rotation criterion (RROT) | Considers failure if the adjacent plies rotate excessively with one another |
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8 | Transverse normal shear () | Considers invariant through-the-thickness |
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9 | Linear elastic fracture | Virtual crack closure technique (VCCT), discrete cohesive zone model (DCZM) |
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