About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
|
Presentation Title |
On the Generality of the Contact Stiffness Relationship in Frictional Contact of Dissimilar Elastic Solids |
Author(s) |
Yanfei Gao, Allan Bower |
On-Site Speaker (Planned) |
Yanfei Gao |
Abstract Scope |
From a similarity analysis, the classic Sneddon relationship between contact stiffness and contact size is valid for axisymmetric, frictionless contact, in which the two contacting solids are approximated by elastic half-spaces. Deviation from this result critically affects the accuracy of the Oliver-Pharr methodology. When finite Coulomb friction exists between an elastic half-space and a flat-ended rigid punch with circular or noncircular shape, the correction factor is found to be a function of the friction coefficient, Poisson’s ratio, and the contact shape, but independent of the contact size. Analytical solutions based on Dundurs parameters are derived. For non-circular punch contact, the results can be represented using the equivalence between the contact problem and bi-material fracture mechanics. The correction factor is found to be a product of that for the circular contact and a multiplicative factor that depends only on the punch shape. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, |