Accession Number : ADA326411

Title :   Effects of Microcracks and Imperfect Interface on the Thermoelastic Response and Failure of Composites.

Descriptive Note : Final technical rept. Sep 93-Jan 97,

Corporate Author : MATERIALS SCIENCES CORP FORT WASHINGTON PA

Personal Author(s) : Hashin, Z.

PDF Url : ADA326411

Report Date : FEB 1997

Pagination or Media Count : 126

Abstract : The thermoelastic behavior of composites containing many dispersed microcracks has been studied. A variational analysis of thermoelastic properties and internal stresses of cracked laminates with imperfect interlaminar interface has been developed. Effective elastic moduli and thermal expansion coefficient of particulate and fiber composites containing many microcracks have been evaluated on the basis of the differential scheme. Macro-residual strains produced by cyclic loading of brittle composites have been expressed in terms of the effective thermal expansion coefficients. A finite fracture criterion for the spontaneous development of new crack surface has been established and has been applied for prediction of crack initiation in laminates. A criterion for debonding of the entire interface in a composite has been established in terms of applied average stresses and temperature.

Descriptors :   *FIBER REINFORCED COMPOSITES, *THERMOELASTICITY, *MICROCRACKING, INTERFACES, LAMINATES, SHEAR MODULUS, MODULUS OF ELASTICITY, FRACTURE(MECHANICS), SURFACES, BRITTLENESS, THERMAL EXPANSION, SHEAR STRESSES, TEMPERATURE COEFFICIENTS.

Subject Categories : Laminates and Composite Materials
      Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE