Abstract
Some preliminary results are presented from a study on the effect of interphases on the transverse strength of unidirectional fiber-reinforced composites. It is assumed that a thin reaction zone (intermolecular bonding at the fiber/matrix interface) defines the bond between the fibers and the matrix. A variationally coupled finite element - boundary element method is employed to obtain the mechanical response of a hexagonal unit cell which contains a center fiber and parts of surrounding fibers. For a given interfacial stiffness, the unit cell is loaded until a critical value of the circumferential stress component in the matrix just outside the interface is reached. Under the same applied load, the problem is then solved with a radial matrix crack of a given length at the critical location. The mixed mode stress intensity factors are extracted by evaluating interaction integrals over a finite element domain surrounding the crack tip, and the direction of crack propagation is predicted by a maximum principal stress criterion. The circumferential stress distributions in the matrix just outside the interfaces are then examined to determine future crack nucleation sites.
Original language | English (US) |
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Title of host publication | Damage Mechanics in Composites |
Publisher | Publ by ASME |
Pages | 133-140 |
Number of pages | 8 |
Volume | 150 |
ISBN (Print) | 0791811085 |
State | Published - 1992 |
Externally published | Yes |
Event | Winter Annual Meeting of the American Society of Mechanical Engineers - Anaheim, CA, USA Duration: Nov 8 1992 → Nov 13 1992 |
Other
Other | Winter Annual Meeting of the American Society of Mechanical Engineers |
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City | Anaheim, CA, USA |
Period | 11/8/92 → 11/13/92 |
ASJC Scopus subject areas
- Mechanical Engineering