Transient subcritical crack-growth behavior in transformation-toughened ceramics

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(90)90099-3· OSTI ID:7018582

Dauskardt, R H; Ritchie, R O ^[1]; Carter, W C ^[2]; Veirs, D K ^[3]

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1. Univ. of California, Berkeley (United States) Lawrence Berkeley Lab., CA (United States)
2. National Inst. for Standards and Technology, Gaithersburg, MD (United States)
3. Lawrence Berkeley Lab., CA (United States)

Transient subcritical crack-growth behavior following abrupt changes in the applied load are studied in transformation-toughened ceramics. A mechanics analysis is developed to model the transient nature of transformation shielding of the crack tip, K{sub s}, with subcritical crack extension following the applied load change. conditions for continued crack growth, crack growth followed by arrest, and no crack growth after the load change, are considered and related to the magnitude and sign of the applied load change and to materials properties such as the critical transformation stress. The analysis is found to provide similar trends in K{sub s} compared to values calculated from experimentally measured transformation zones in a transformation-toughened Mg-PSZ. In addition, accurate prediction of the post load-change transient crack-growth behavior is obtained using experimentally derived steady-state subcritical crack-growth relationships for cyclic fatigue in the same material.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7018582
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 38:11; ISSN 0956-7151; ISSN AMATE
• 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
ALKALINE EARTH METAL COMPOUNDS
CERAMICS
CHALCOGENIDES
CRACK PROPAGATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS TESTING
MECHANICAL TESTS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
STABILIZATION
TESTING
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES