Medium strain rate tensile experiment device

Abstract

The invention relates to the technical field of dynamic mechanical property testing of materials, in particular to a medium-strain-rate tensile experiment device. Comprising a drop hammer, a base, a sample clamp and a sample, the sample clamp comprises an upper clamp and a lower clamp, the upper clamp is fixedly arranged, and the sample is arranged between the upper clamp and the lower clamp; the base is connected with the lower clamp, and the drop hammer is arranged above the base; and a buffer pad corresponding to the drop hammer is arranged on the upper surface of the base. The physical parameters of the buffer pad are designed, and the device is extremely simple in structure and convenient to operate; the strain rate can be quickly stable; and the strain rate can be accurately controlled, a corresponding relation is established between the physical parameters of the cushion pad, the base mass and the drop hammer mass, and the strain rate can be accurately and stably controlled by selecting the cushion pad with proper physical parameters.

Description

technical field [0001] The invention relates to the technical field of material dynamic mechanical performance testing, in particular to a medium strain rate tensile test device. Background technique [0002] Strain rate is an important parameter for the mechanical properties of materials. Usually, the strain rate distribution of materials is wide, which brings challenges to the study of material strain rates. At present, most of the researchers' studies on the strain rate of materials focus on the low strain rate range (1s -1 below) and high strain rate range (100s -1 above), centering strain rate (1s -1 ~100s -1 ) are relatively scarce. In practical engineering applications, it is very important to understand the stress-strain behavior of a material at a medium strain rate, and a large number of experiments have shown that when the material is from a low strain rate to a high strain rate, the medium strain rate is in the middle of the mechanical properties of the mate...

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Problems solved by technology

[0006] (1) The driving source of the impact output is mostly electric drive or indirect electric drive. The test principle is consistent with the Hopkinson rod, and the strain rate is difficult to maintain stability.

[0007] (2) There are too many connectors between the shock source and the sample, the shock wave is transmitted to the sample after passing through multiple connectors, and the strain rate of the sample is difficult to accurately analyze and control

[0008] (3) There is a lack of a quantitative control method for the strain rate, and whether a stable strain rate control can be achieved in the prior art is questionable.

[0009] Therefore, in the prior art, due to the delay of the impact response during the tensile test, the constant strain rate cannot be guaranteed, so that the stress-strain curve obtained in the experiment cannot represent the mechanical properties of the material at a stable strain rate.

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