Fracture of metal/ceramic laminates - II. Crack growth resistance and toughness

被引：70

作者：

Hwu, KL ^{[1
]}

Derby, B ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

ACTA MATERIALIA | 1999年 / 47卷 / 02期

关键词：

D O I：

10.1016/S1359-6454(98)00358-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 behaviour of the lower metal yield strength Cu/alumina and Al/alumina laminates so well, although it does account for the general trend of their behaviour. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：545 / 563

页数：19