Split Hopkinson pressure bar (SHPB) test system alt1000

——It is equipped with waveform data automatic analysis software to provide external test service

Hopkinson bar is an effective experimental device to study the dynamic mechanical properties of materials under one-dimensional stress state. The device impacts the sample through the uniform transmission of the stress wave, and tests the strain of the sample when it is subjected to the dynamic shock stress, and calculates the corresponding parameters such as strain rate, stress, strain energy, incident energy, transmission energy, reflection energy, particle impact velocity and high g value according to the experimental parameters. The typical SHPB device and its data acquisition and processing system are shown in Fig. 1. When the impact rod (bullet) in the gun chamber impacts the elastic input rod at a certain speed, an incident pulse I (stress wave) is generated in the input rod. The stress wave reaches the specimen through the elastic input rod, and the specimen deforms at high speed under the action of the stress pulse. While the stress wave passes through the short specimen, the reflected pulse enters the elastic input rod and the transmission pulse enters the output rod. The impact velocity of the bullet can be obtained by using a velocimeter. The strain pulse recorded by the strain gauge attached to the elastic rod can be used to calculate the dynamic stress and strain parameters of the material.

Schematic diagram of SHPB experimental device