Asperity creep under constant force boundary conditions

作者：Goedecke Andreas^*; Jackson Robert L; Mock Randolf

来源：Wear, 2010, 268(11-12): 1285-1294.

DOI：10.1016/j.wear.2010.01.025

• Asperity
• Creep
• Spherical contact
• Garofalo creep law

This work presents an analysis of the transient creep deformation of a hemisphere in contact with a rigid flat, loaded by a constant force. The analysis is based on extensive finite element simulations, using a Garofalo creep law. Motivated by the simulations, an analytical framework is derived. Starting from the trivial case of a cylinder, the analytical framework can be generalized by exchanging a few functionals: this will describe the spherical geometry under analysis. The necessary functionals are derived by using a combination of analytical and empirical models. The resulting model accurately predicts the creep evolution of arbitrary asperities for a wide parameter range, requiring only the bulk material parameters. The results are interpreted in view of transient friction effects with creep as their possible cause.

• 出版日期2010-5-12