Large Strain Range Dynamic Testing at High and Medium Strain Rates, Using a Common Scale SHPB

H. Zhao , G. Gary

The measuring duration of a SHPB (Split Hopkinson Pressure Bar) set-up is limited by the length of the bars because of the superimposition of the waves propagating in opposite directions, so that there exists a limitation of maximum measurable strains in material testing applications. This paper presents a new two-gauges measurement method taking account of the correction of wave dispersion effects, as it is indeed indispensable for long time measurements. Using bars of common dimensions, it allows for a quasi-unlimited measuring duration (one hundred times longer than the classical one). It is applied to test soft materials like foam (metallic or polymeric) at low strain-rates (10/s), in the complete range of their response (nominal strains up to 80% ). It is also successfully used to perform large displacement tests such as crushing of metallic tubes.

Domaines: Articles anciens

H. Zhao, G. Gary. Large Strain Range Dynamic Testing at High and Medium Strain Rates, Using a Common Scale SHPB. Journal de Physique IV Proceedings, 1997, 07 (C3), pp.C3-341-C3-346. ⟨10.1051/jp4:1997360⟩. ⟨jpa-00255517⟩