A CT in situ analysis method of PBX damage evolution based on acoustic emission signals

Abstract

The invention discloses an acoustic emission signal-based PBX damage evolution CT in-situ analysis method. The method comprises building a CT in-situ loading and damage detection experimental system composed of a uniaxial in-situ loading system, a CT scanning system and an acoustic emission monitoring system, carrying out mechanical loading, acquiring an acoustic emission signal, determining CT scanning load nodes according to acoustic emission signal characteristics, acquiring CT images in different loading stages, extracting crack forms of the CT images, carrying out 3D visual and quantitative analysis, and quantitatively describing the damage evolution of the PBX material in loading according to a material loading curve, acoustic emission signal characteristics and the crack 3D characteristics of the CT images in different loading stages. The method combines the on-line monitoring of the acoustic emission technology, utilizes the CT in-situ observation method to realize quantitativedescription of damage evolution of the PBX material during loading, has the advantages of accurate capture of the initial point of the crack and visualization of the damage evolution process, is easyto realize and operate, has high efficiency and can be widely used for analysis of PBX material damage evolution.

Description

technical field [0001] The invention relates to the field of research on damage evolution of PBX materials, in particular to a CT in situ analysis method for PBX damage evolution based on acoustic emission signals. Background technique [0002] PBX (Polymer Bonded Explosive) is the abbreviation of polymer bonded explosive. Polymer bonded explosive is a particle-filled composite material bonded with high-energy explosive particles and high polymer binder as the main components. It is used in conventional weapons It is widely used in warheads and rocket propellants. In use, PBX not only bears complex structural loads, but also as an energetic material, it also needs to ensure good combustion and explosion functions. Therefore, PBX also plays an important role as a special functional material and a structural component. [0003] The service environment of PBX is very complex, and it is in different loading rates and stress states during production, processing, transportation, ...

AI Technical Summary

Problems solved by technology

On the one hand, the stress selection of CT scanning depends on experience, and the selection of scanning load nodes has no intuitive correspondence with the damage state of the material. The blind selection of scanning load nodes not only leads to an increase in the cost of the experiment, but also fails to capture the microcrack initiation and propagation process. ; on the other hand, the stress state of the specimen after unloading is very different from that during loading, and the crack shape after unloading is also different from that under loading

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