DEVELOPMENT OF PLASTIC ZONES AND RESIDUAL-STRESS IN ELASTOPLASTIC CONTACT PROBLEMS WITH STRESS SINGULARITIES IN ELASTIC RANGE

Stress singularities appear in such elastic contact problems as a plan e indenter compressing a semi-infinite body, or the axisymmetric case of a turbine disc shrunk onto a shaft. The stress is infinite at the e dge of the corner of the indenter and the disc as well as in neighbour ing areas of the semi-infinite body and the shaft. In this paper the c omplex investigation of the distributions of plastic zones, deformatio ns, pressure and residual stress has been presented for plane indenter s of different shapes being in elasto-plastic contact with semi-infini te bodies. Different strain-hardening characteristics of the material, different yield criteria and states of stress/strain have been consid ered. The aim of the investigation is to find an answer to the questio n, what happens to the stress singularity, which appears in the elasti c solution? The considered problem is of interest from the cognitive p oint of view and is of real importance in engineering practice.