Flow behaviour in compression test under various lubrication conditions

Flow behaviour in compression test under various lubrication conditions

Paper in proceedings (conference paper)

The compression test provides a useful information about the material flow under large plastic deformations, when compared to the standard tensile test. On the other hand, it is heavily dependent on the lubrication conditions. The paper deals with two different specimen geometries resulting in two different friction conditions. The first geometry corresponds to the classical smooth cylinder. The second one was designed according to the idea of Rastegaev. It is a smooth cylinder with grooves on both faces (bases), which allow the lubricant to accumulate and prevent it from escaping the region, where the punches are in the contact with specimen. Then, both cases were computationally simulated and compared with experiments.

The compression test provides a useful information about the material flow under large plastic deformations, when compared to the standard tensile test. On the other hand, it is heavily dependent on the lubrication conditions. The paper deals with two different specimen geometries resulting in two different friction conditions. The first geometry corresponds to the classical smooth cylinder. The second one was designed according to the idea of Rastegaev. It is a smooth cylinder with grooves on both faces (bases), which allow the lubricant to accumulate and prevent it from escaping the region, where the punches are in the contact with specimen. Then, both cases were computationally simulated and compared with experiments.

Upsetting test; Friction; Equivalent stress; Negative stress triaxiality; Punch

Upsetting test; Friction; Equivalent stress; Negative stress triaxiality; Punch

ŠEBEK, F.; ZAPLETAL, J.; KUBÍK, P.; PETRUŠKA, J.

2020

13.05.2019

978-80-87012-71-0

Engineering Mechanics 2019

351

354

4