Fracture of metal/ceramic laminates. 2: Crack growth resistance and toughness

Journal Article · Fri Jan 15 04:00:00 EST 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00358-9· OSTI ID:329055

Hwu, K L; Derby, B ^[1]

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1. Univ. of Oxford (United Kingdom). Dept. of Materials

The propagation of cracks has been studied through Al/alumina, Cu/alumina and Ni/alumina laminates, with a range of metal and ceramic thicknesses. Two specimen orientations were chosen to propagate a crack either through the metal and ceramic layers in parallel or through the layers sequentially and perpendicular to the laminate. In both orientations a rising T-curve (toughness) was found with increasing crack length with a very steeply rising T-curve at large crack extensions. These observations can be explained by a large-scale bridging model with a crack closure traction imposed by the plastically deforming metal ligaments in the wake of the propagating crack. A simple model is derived which predicts the performance of the Ni/alumina laminates well. It does not predict the behavior of the lower metal yield strength Cu/alumina and Al/alumina laminates so well, although it does account for the general trend of their behavior.

• OSTI ID: 329055
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
COMPOSITE MATERIALS
COPPER
CRACK PROPAGATION
FRACTURE PROPERTIES
LAYERS
MATHEMATICAL MODELS
NICKEL
PREDICTION EQUATIONS