Assessing the mechanical properties of materials at intermediate strain rates (1-200/s) is one of the major concerns in impact engineering. Servo-hydraulic machines are usually used at this range of strain rates. However, detrimental oscillations appear on the measured load for strain rates above 10/s. In this paper, we present a modified servo-hydraulic machine. The load is measured by a Hopkinson bar-like technique. Besides, the BCGO wave separation method is used to overcome the limited test duration problem. Moreover, the strain in the sample is measured using Digital Speckle Photographs (DSP) which are captured via high-speed video camera. This modified machine is an equivalent and alternative solution to the slow bar technique. It is applied to aluminium 2017 T4 alloy at strain-rates of approximately 100/s. Compared to the piezoelectric force sensor, the Hopkinson bar-like method gives less-oscillating signals. The sample attaching device is also taken into account. It is considered as a rigid mass. This simple assumption is valid up to strain-rates

International audienceAdhesively bonded assemblies are in increasing use in multiple engineering applications. However, they can endure impact loads. The measurement, of these assemblies mechanical behaviour, under dynamic loads is of great concern. Several works used the split Hopkinson pressure bar (SHPB) method to assess the strength of adhesive joints at high loading rates. In this paper, we investigated the accuracy of SHPB tests on double-lap bonded joints by three-dimensional finite-element analysis. For this analysis, an elastic behaviour is assumed for both adherends and adhesive. We were interested in the influence of material, geometrical and dynamic parameters on the SHPB accuracy. From this study, we can conclude that the SHPB bar method gives a good estimation of the mean adhesive stress value. However, its estimation, to the mean adhesive strain and to the maximum adhesive stress and strain, is rather bad. A unified parameter is therefore proposed to help designing specimens and to correct the SHPB results