An elastoplastic finite element study of cylindrical plane-strain contact for steel/steel and Inconel 617/Incoloy 800H undergoing unidirectional sliding

Abstract

The current work employs a two-dimensional plane strain finite element analysis to investigate the unidirectional sliding contact between a deformable half-cylinder and a deformable flat block. The unidirectional sliding is governed by a displacement-controlled action where the materials of the two contacting bodies are first set to identical steels at 20 ℃ and then to Inconel 617 and Incoloy 800H at 800 ℃. First, a normal interference (indentation) is applied, which is followed by unidirectional sliding. The von Mises stress distribution, plastic strain distribution, junction growth, normal force, tangential force, effective coefficient of friction, and scars on the surface of the block are obtained during the sliding motion. The leading edge of the contacting area and the bulk material under the leading edge experience large von Mises stresses. The large plastic strain is found on the surface of the block, and forms a “pocket” shape under the surface. The junction growth is also investigated, showing the direction of the growth is in the same direction of the tangential force that the weaker material experiences. The forces and the effective coefficient of friction are found to stabilize after a certain sliding distance, and the effective coefficient of friction converges to the coefficient of friction used in the model. Pileup is found on the surface of the block after a sufficient unidirectional sliding distance.

Tangential elastic contact model of the cylindrical contact with different axis crossing angles

“…The contact stress calculation formula especially considers the influence of the normal force, the total bearing length, the comprehensive radius of curvature and the position angle. Huaidong et al 16 used two-dimensional plane strain finite element analysis (FEA) to study the unidirectional sliding contact between a deformable semi-cylinder and a deformable flat block. One-way sliding is controlled by displacement control, and junction growth has also been studied, indicating that the growth direction is the same as the direction of the tangential force experienced by the weaker material.…”