A damage mechanics of a particle-reinforced ductile matrix composite with progressive partial debonding

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:175158

Zhao, Y H; Weng, G J ^[1]

---

1. Rutgers Univ., New Brunswick, NJ (United States)

A micromechanical damage theory is developed to determine the overall elastoplastic stress-strain behavior of a ductile composite containing homogeneously dispersed prolate inclusions which, under the action of external tension, experience debonding on the top and bottom of the interface. The debonding process is described by Weibull`s probability function in terms of the tensile stress of the inclusions. Qiu and Weng`s energy approach is also used here to determine the internal stress state of the damaged composite. The initial two-phase system gradually turns into a three-phase one as the debonded inclusions lose their load-carrying capacity partially. The stress-strain responses are then derived as a function of volume concentrations of still bonded particles and already debonded ones, and of the shape of inclusions and the average interfacial strength. It is shown that the stress-strain curve of the system always starts out with that of perfectly a bonded composite, then deviates from it, and finally approaches a state parallel to that of a porous material containing similarly aligned voids. A detail comparison is provided with the results from Mochida, Taya, and Obata`s rigid particle theory with an elastic matrix and Togho and Weng`s completely debonding theory with an elastoplastic matrix. It is found that the behavior of a partially debonded composite always lies between the two.

• OSTI ID: 175158
• Report Number(s): CONF-950686--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS
COMPOSITE MATERIALS
INCLUSIONS
INTERFACES
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PROBABILITY
REINFORCED MATERIALS
STRAINS
STRESSES
VOIDS