Shear induced transformation toughening in ceramics

Journal Article · Mon Oct 31 23:00:00 EST 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90448-0· OSTI ID:6821358

Simha, N; Truskinovsky, L ^[1]

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1. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Aerospace Engineering and Mechanics

There is experimental evidence that the tetragonal to monoclinic transformation in zirconia (ZrO[sub 2]) can be triggered not only by hydrostatic pressure but also by shear stresses. In this paper the authors consider the implications of a transformation criterion which depends on both mean stress and shear stress on transformation toughening in ceramics reinforced with zirconia inclusions. They treat zirconia toughened ceramics (ZTC) as dilute composites of randomly oriented inclusions in an elastic matrix and develop the constitutive model for the composite from the behavior of single inclusions by orientation averaging. They then study quasistatic crack propagation and predict the transformation zone, distribution of transformed inclusions and toughness enhancement.

• OSTI ID: 6821358
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:11; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHALCOGENIDES
CRACK PROPAGATION
CRYSTAL-PHASE TRANSFORMATIONS
FRACTURE PROPERTIES
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES