Accession Number : AD0718868

Title :   The Fracture Energy of Composite Materials.

Descriptive Note : Final rept. 1 Sept 69-31 Aug 70,

Corporate Author : VERMONT UNIV BURLINGTON

Personal Author(s) : Outwater,John O. ; Murphy,Michael C.

Report Date : 01 FEB 1971

Pagination or Media Count : 19

Abstract : The double torsion technique was employed to determine the fatigue behaviorof epoxy resin as it characteristically produces stable crack movement inbrittle materials. Preliminary results indicate the existence of an endurancelimit which is approximately 60% of the fracture load. During fatigue testing,there was a 12% increase in both the shear modulus and Young's modulus. Thefracture load also increased about 12%. These two effects may be due to astress induced cross-linking. (Author, modified-PL)

Descriptors :   (*EPOXY RESINS, FATIGUE(MECHANICS)), REINFORCED PLASTICS, FRACTURE(MECHANICS), LOADS(FORCES), TORSION, CRACK PROPAGATION

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE