Interlaminar shear cracking in cross-ply brittle matrix composites

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:175375

Bao, G; Lin, Z ^[1]

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1. Johns Hopkins Univ., Baltimore, MD (United States)

A micromechanics study is carried out for interlaminar shear cracking in cross-ply, fiber reinforced brittle matrix composites. Attention is focused on 0{degrees}/90{degrees} laminated composites containing multiple transverse cracks in the 90{degrees} layers under pure shear or under combined shear and residual stressing. The composite is taken to be linear elastic, orthotropic, with homogenized elastic constants. A dislocation formulation is employed to model a doubly periodic array of cracks; the resulting singular integral equations are solved numerically. Systematic predictions are made for the energy release rate and the reduction in composite stiffness as determined by crack spacing and the elastic mismatch; the overall stress-strain relations of a laminate containing multiple cracks are constructed. Closed-form solutions to the crack initiation problem are also obtained. The influence of residual stresses on the orientation and growth of both isolated and multiple tunneling cracks is considered. The model developed and results obtained in the present study can be an lied to laminates under combined tension and shear when the latter is dominant.

• OSTI ID: 175375
• Report Number(s): CONF-950686--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
COMPOSITE MATERIALS
CRACKS
FRACTURE PROPERTIES
INTEGRAL EQUATIONS
LAYERS
MATRIX MATERIALS
RESIDUAL STRESSES
SHEAR