Accession Number:

ADA255974

Title:

Delamination Growth Behavior in Cross-Ply Laminated Composites Due to Transverse Concentrated Loading

Descriptive Note:

Annual progress rept. 1 Oct 1990-31 Sep 1991,

Corporate Author:

STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s):

Report Date:

1992-04-01

Pagination or Media Count:

28.0

Abstract:

An analytical model was developed to study the delamination growth behavior of graphiteepoxy cross-ply laminated composites resulting from quasi- static transverse concentrated loads. The objective of the study was to fundamentally understand the interaction between the initial matrix cracking and the delamination initiation and growth in laminated composites due to transverse concentrated loads. During this period of the investigation, attention is given to the growth of the surface matrix crack-induced delamination in cross-ply composites and the interaction between the matrix cracking and the delimination initiation and propagation inside the laminates. Based on the study, it shows that delamination growth in laminated composites due to transverse loads is strongly affected by the initial matrix cracks. Delamination induced by a bending crack surface would grow into a slender shape with its major axis parallel to the direction of the surface cracks. Mode I fracture toughness dominates the initiation and growth of the delamination induced by the bending cracks. Also, bending crack-induced delamination is stable in laminated composites.

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE