Cracking of laminates subjected to biaxial tensile stresses

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08946.x· OSTI ID:382460

Hillman, C; Suo, Z; Lange, F F ^[1]

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1. Univ. of California, Santa Barbara, CA (United States). Materials Dept.

During the processing of laminar ceramic, biaxial residual stresses can arise due to differential thermal contraction between unlike layers. A tensile stress can cause preexisting flaws to extend across the layer and into the adjacent layers and then tunnel until they meet either another crack or a free surface. A previous analysis has shown that for a given residual stress there is a critical layer thickness, below which no tunnel cracks will exist, regardless of initial flaw size. Here, the previous analysis was modified to take into account the crack extension into adjacent layers. To determine the validity of the analysis, laminates composed of alternating layers of zirconia and alumina/zirconia were fabricated by a sequential centrifugation technique. The composition of the alumina/zirconia layer was varied to change the biaxial, tensile stresses in the zirconia layer. Observations were then made to determine the critical layer thickness for tunnel cracks and their extension into the adjacent layers. These observations were compared to the theoretical predictions.

• Sponsoring Organization: USDOE
• OSTI ID: 382460
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CORRELATIONS
CRACKS
ELECTRONIC EQUIPMENT
FRACTURE PROPERTIES
INTERFACES
LAYERS
PREDICTION EQUATIONS
RESIDUAL STRESSES
STRAINS
THERMAL EXPANSION
YTTRIUM OXIDES
ZIRCONIUM OXIDES