Explosion loading device based on one-dimensional strain conditions and use method

Abstract

The invention discloses an explosion loading device based on one-dimensional strain conditions. The explosion loading device comprises a loading module used for explosion impact, a constraint module for realizing one-dimensional strain and a measuring module used for experiment data collection, wherein the loading module comprises an exploder, explosives, a container and a medium used for uniformly transmitting an explosion load onto a test piece; the constraint module comprises a steel pipe, an upper metal plate and a lower metal plate; the steel pipe is provided with an observation window; and the measuring module comprises a support structure, a laser interference velocimeter used for measuring the movement speed of a back plate, a sensor used for measuring action pressure, a sensor used for measuring air overpressure, a high-speed camera used for observing a material compression process, a strain gage used for measuring the steel pipe deformation and an oscilloscope used for collecting data. The small-test-piece one-dimensional strain loading experiment on a brittle porous material can be realized, so that a local explosion loading experiment using big test pieces for meeting the one-dimensional strain loading conditions is avoided; the measurement on experiment parameters in the explosion loading process can be increased; and meanwhile, the test piece compression process can be observed.

Description

technical field [0001] The invention relates to the field of impact protection engineering, in particular to an explosive loading device based on one-dimensional strain conditions. Background technique [0002] Porous materials are widely used in protection design due to their impact resistance properties such as light weight, clipping and constant feedback load. Under normal circumstances, the mechanical properties of elastoplastic porous materials are mostly in line with the real stress conditions. After the cell body is squeezed and collapsed, the internal space is completely released, and there is no obvious change in the lateral dimension. Therefore, the stress-strain curves of elastoplastic porous materials under one-dimensional stress loading and one-dimensional strain loading are consistent, and there will be stress plateaus. The stress plateau is an important parameter to evaluate its absorption of impact energy. However, for brittle porous materials, such as porou...

AI Technical Summary

Problems solved by technology

In addition, brittle porous materials do not have an obvious stress plateau under one-dimensional stress loading, so it is impossible to judge their ability to absorb impact energy

At present, some researchers use the method of constraining the lateral deformation of the specimen with a steel sleeve to realize the one-dimensional strain quasi-static compression experiment of brittle porous materials, but they have not involved the one-dimensional strain loading method under the impact of the explosion

In addition, the mechanical properties of brittle porous materials under one-dimensional strain quasi-static loading cannot fully reflect their mechanical response under explosive impact

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