Modeling the mechanical behavior of brittle matrix composites using a finite element approach

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7030546

Juhlin, N F

A debonding energy analysis is performed to determine the region (slip zone) in a cracked continuous fiber reinforced brittle matrix composite (BMC) where the matrix displaces relative to the fibers. A frictionally constrained fiber/matrix interface, a bonded interface, initial stresses, and the transversely isotropic properties of the fibers are considered. A finite element procedure is applied to a composite cylinder model to investigate the effect of Poisson's ratio on the interfacial stress distribution. A resulting slip zone is also obtained and agrees well with the debonding energy analysis. For a multiple fiber BMC, a double layer technique is introduced and incorporated into an existing finite element code. One layer of two dimensional elements represents the matrix materials and the second layer represents the fibers as a continuous medium. Results from the energy analysis are used to establish a slip zone in the finite element model where the matrix elements displace relative to the fiber elements. Body forces are utilized in the slip zone to simulate the frictional stresses at the interface. A parametric study of the microstructural variables is conducted and the resulting finite element method is applied to various crack geometries and loading conditions.

• Research Organization: Washington Univ., Seattle, WA (United States)
• OSTI ID: 7030546
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BRITTLENESS
COMPOSITE MATERIALS
FIBERS
FINITE ELEMENT METHOD
INTERFACES
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
STRESS ANALYSIS