Driving forces in moving-contact problems of dynamic elasticity: Indentation, wedging and free sliding

Leonid I. Slepyan*, Michele Brun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The steady-state solution for an elastic half-plane under a moving frictionless smooth indenter of arbitrary shape is derived based on the corresponding transient problem and on a condition concerning energy fluxes. Resulting stresses and displacements are found explicitly starting from their expressions in terms of a single analytical function. This solution incorporates all speed ranges, including the super-Rayleigh subsonic and intersonic speed regimes, which received no final description to date. Next, under a similar formulation the wedging of an elastic plane is considered for a finite wedge moving at a distance from the crack tip. Finally, we solve the problem for such a wedge moving along the interface of two elastic half-planes compressed together. Considering these problems we determine the driving forces caused by the main underlying factors: the stress field singular points on the contact area (super-Rayleigh subsonic speed regime), the wave radiation (intersonic and supersonic regimes) and the fracture resistance (wedging problem). In addition to the sub-Rayleigh speed regime, where the sliding contact itself gives no contribution to the driving forces, there exists a sharp decrease in the resistance in the vicinity of the longitudinal wave speed with zero limit at this speed.

Original languageEnglish
Pages (from-to)1883-1906
Number of pages24
JournalJournal of the Mechanics and Physics of Solids
Issue number11
StatePublished - Nov 2012


FundersFunder number
FP7-People-2011-IAPP European Union
Seventh Framework Programme284544
Università di Cagliari
Regione Autonoma della Sardegna


    • Analytic functions
    • Contact mechanics
    • Dynamics
    • Moving indentation
    • Wedging


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