Influence of interface and random arrangement of inclusions on local stresses in composite materials
- Michigan State Univ., East Lansing, MI (United States)
The analysis of the local stress fields in composite materials is a very important and complex problem in micromechanics. There are many factors which influence the stress fields: the material properties of constituents, the shape and relative size of reinforcement (inclusions), the boundary conditions at the inclusion-matrix interfaces, and other. A fundamental problem in micromechanics is one involving a single inclusion. Perhaps the most famous result dealing with a single inclusion is due to Eshelby (1957), who found that the stress in an ellipsoidal and perfectly bonded inclusion is uniform, under a constant loading. However, when two or more inclusions are present, the stress fields are more complex and so is their evaluation. The additional complexity is added when the bonding at the inclusion-matrix interface is not perfect. In this paper we study the joint effect of random geometric arrangement and matrix-inclusion interface in composites by using experimental, numerical, and analytical approaches. We conduct the experiments on model composites consisting of copper inclusions and photoelastic epoxy matrix. We use this very idealized composite system because of its easy handling characteristics and isotropic properties of components. Also, the measurements are facilitated due to the larger scale of the specimen. We prepare specimens with several random arrangements of inclusions, several volume fractions, and different interface conditions. We vary the interfaces by using several types of coatings and include perfectly bonded and debonding cases. In this paper we study the local stress fields in the above model composites by using the photoelasticity method. Additionally, we conduct the finite element calculations for the composite systems with the same geometry and material properties. Also, we employ analytical techniques in the studies of simple geometries.
- OSTI ID:
- 175311
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0268
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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