Three dimensional effects in composite plates

Santosh Prabhu, John Lambros

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, a finite element investigation of the three dimensional nature of stress fields in the near tip region of a cracked orthotropic plate was conducted. Two and three dimensional finite element analyses were used to investigate the relative extent of regions of three dimensional to two dimensional (plane stress or plane strain) deformation in the cracked plate. The material properties used in the simulations corresponded to those of a graphite/epoxy composite. A three point bend loading geometry, with the fiber directions either parallel or perpendicular to the crack, was simulated. In analogy to isotropic materials, it was observed that a plane stress K-dominant region does not arise arbitrarily close to the crack tip because of the existence of a three dimensional zone. However, it was seen that the shape and the size of this three dimensional zone in the cracked composite plate is substantially different from that of an isotropic plate, and depends intimately on material properties. For a crack parallel to the fiber direction the three dimensional zone extends to 0.46h (h = specimen thickness) ahead of the crack tip but only to 0.27h at 30°. Fibers perpendicular to the crack produce a highly elongated three dimensional zone in the direction of the fibers (up to 0.78h). The zone is also sensitive to the variations in the Poisson's ratio's of the orthotropic solid.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
PublisherASME
Pages61-68
Number of pages8
ISBN (Print)0791816524
StatePublished - Dec 1 1999
Externally publishedYes
EventThick Composites for Load Bearing Structures - 1999 (The ASME International Mechanical Engineering Congress and Exposition) - Nashville, TN, USA
Duration: Nov 14 1999Nov 19 1999

Publication series

NameAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
Volume235
ISSN (Print)0160-8835

Other

OtherThick Composites for Load Bearing Structures - 1999 (The ASME International Mechanical Engineering Congress and Exposition)
CityNashville, TN, USA
Period11/14/9911/19/99

ASJC Scopus subject areas

  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Three dimensional effects in composite plates'. Together they form a unique fingerprint.

Cite this