Modelling of R-curve behavior in ceramic/metal composites

Journal Article · Fri Nov 20 04:00:00 EST 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00317-6· OSTI ID:302364

Raddatz, O; Schneider, G A; Claussen, N ^[1]

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1. Technical Univ. Hamburg-Harburg, Hamburg (Germany). Advanced Ceramics Group

The incorporation of metals into brittle solids is a successful way to improve their mechanical properties. In the present study, emphasis is placed on the toughness increase of such composites, shown by their R-curve behavior. Although the increased toughness has been experimentally verified in many cases, the theoretical prediction is still a question of concern. The material specific property which controls the toughening effect is the bridging stress relation of the metal reinforcements. In a first part of this paper, a theoretical calculation of this bridging relation from crack opening displacement measurements will be presented. In a second part, a variety of bridging relations will be used to demonstrate their effect on the R-curve behavior of a composite. Both calculations will be verified with experimental results of an Al/Al{sub 2}O{sub 3} model composite material, where the bridging relation was also measured experimentally.

• OSTI ID: 302364
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 18 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CRACK PROPAGATION
FRACTURE PROPERTIES
MATHEMATICAL MODELS