Accession Number : AD0709214

Title :   EXPLORATORY DEVELOPMENT OF FRACTURE MECHANICS OF COMPOSITE SYSTEMS.

Descriptive Note : Annual progress rept. May 69-Apr 70,

Corporate Author : LEHIGH UNIV BETHLEHEM PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS

Personal Author(s) : Sih,G. C. ; Hilton,P. D. ; Wei,R. P.

Report Date : JUN 1970

Pagination or Media Count : 128

Abstract : The objective of the research program is to provide an improved understanding of the failure of composites from the fracture mechanics point of view. Such an approach assumes that the composite posseses built-in imperfections such as voids or cracks developed during the fabrication process or under operating stresses. Two composite systems are studied: the first is a fiber- reinforced composite and the second a laminated composite. Theoretical analyses made in terms of continuum mechanics for stress distributions are carried out to establish the relationships among the pertinent parameters. Such a study should reveal the necessary insight for developing failure criteria of composites. Some preliminary experimental results on fracture toughness and crack growth rates of uni- directionally fiber reinforced composites are also given. (Author-PL)

Descriptors :   (*COMPOSITE MATERIALS, FRACTURE(MECHANICS)), FIBERS, LAMINATES, CRACKS, ELASTIC PROPERTIES, STRESSES, LOADS(FORCES), NOTCH TOUGHNESS, NUMERICAL ANALYSIS

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE