Analysis of cracks in nonlinear fiber composite materials

Technical Report · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5360817

Yu, T P; Wang, S S

The effect of effective material nonlinear properties of fiber composites on crack behavior is studied. Three-dimensional nonlinear constitutive equations are established, based on both complementary energy density and deformation plasticity approaches. A system of highly nonlinear, coupled governing partial differential equations are derived for a generalized plan deformation problem of the composites. Orders of stress singularity near cracks in both 0 deg - and 90 deg - fiber composites are obtained. A dimensional analysis based on conservation integrals in nonlinear mechanics is used first to achieve this goal. Also, the stress singularities and asymptotic stress fields of the fiber composites are obtained by directly solving the governing partial differential equations.

• Research Organization: National Center for Composite Materials Research, Urbana, IL (United States)
• OSTI ID: 5360817
• Report Number(s): AD-A-233853/1/XAB; CNN: N00014-86-K-0799
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
DEFORMATION
DENSITY
DIFFERENTIAL EQUATIONS
ENERGY
EQUATIONS
FRACTURE MECHANICS
INTEGRALS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
NONLINEAR PROBLEMS
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICAL PROPERTIES
PLASTICITY
STABILITY
STRESSES