Delamination mechanism maps for a strong elastic coating on an elastic-plastic substrate subjected to contact loading

Journal Article · Mon Jan 01 04:00:00 EST 2007 · International Journal of Solids and Structures

DOI:https://doi.org/10.1016/j.ijsolstr.2006.10.009· OSTI ID:931646

Xia, Shuman ^[1]; Gao, Yanfei ^[2]; Bower, Allan F. ^[1]; Lev, Leo C. ^[3]; Cheng, Yang-Tse ^[3]

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1. Brown University
2. ORNL
3. General Motors Corporation-R&D

Hard wear resistant coatings that are subjected to contact loading sometimes fail because the coating delaminates from the substrate. In this report, systematic finite element computations are used to model coating delamination under contact loading. The coating and substrate are idealized as elastic and elastic-plastic solids, respectively. The interface between coating and substrate is represented using a cohesive zone law, which can be characterized by its strength and fracture toughness. The system is loaded by an axisymmetric, frictionless spherical indenter. We observe two failure modes: shear cracks may nucleate just outside the contact area if the indentation depth or load exceeds a critical value; in addition, tensile cracks may nucleate at the center of the contact when the indenter is subsequently removed from the surface. Delamination mechanism maps are constructed which show the critical indentation depth and force required to initiate both shear and tensile cracks, as functions of relevant material properties. Numerical results have also been compared to analytical analysis using beam bending and membrane stretching theories.

• Research Organization: Oak Ridge National Laboratory (ORNL); Center for Computational Sciences
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931646
• Journal Information: International Journal of Solids and Structures, Journal Name: International Journal of Solids and Structures Journal Issue: 11-12 Vol. 44; ISSN 0020-7683
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACKS
ELASTICITY
FAILURE MODE ANALYSIS
FINITE ELEMENT METHOD
FRACTURE PROPERTIES
PLASTICITY
PROTECTIVE COATINGS
SUBSTRATES
WEAR RESISTANCE