Model of dynamic compression tests on hydraulic testing machines: Influence of dynamic phenomena

Abstract
The forming process simulation requires models describing the materials behaviour at large strains and at strain rates up to hundreds of s ^-1. The major difficulty then encountered is that few experimental tests enable to reach these two criteria. For a few years, several studies have been carried out on hydraulic machines provided with a dynamic jack. However, for higher strain rates tests, the load measurement is disturbed by the response of the experimental set-up and oscillations appear. In this article, the experimental test is developed and a finite element model of the set-up is introduced.