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Dynamic Evolution of Three-Dimensional Molding Behavior of TATB Molding Powder Systems Based on Digital Volume Correlation
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DOI：10.1016/j.dt.2026.07.016.png)
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Abstract
En 中文
1,3,5-triamino-2,4,6-trinitrobenzene (TATB) is currently the only certified insensitive high explosive (IHE). Polymer-bonded explosives (PBX) based on TATB have significant military applications. Investigating the structural evolution and mechanical behavior of the TATB molding powder system under dynamic loading during compression molding is of great importance. Understanding the evolutionary mechanisms of this particle system under stress is crucial for regulating the mesostructure and overall quality of the molded grain. In this study, high-resolution X-ray micro-computed tomography (X-μCT) combined with in-situ synchronous loading technology was employed to achieve three-dimensional quantitative characterization of both the discrete particle system and the continuous PBX compact. A suite of volume image correction and registration algorithms was developed for the complex TATB molding powder system, enabling the correction and spatial registration of the particle system under different loads. The three-dimensional displacement and strain fields of the particle system were obtained using Local-DVC, Global-DVC, and numerical mapping techniques. The dynamic evolution of these fields at various stages under pressures ranging from 0 to 60 MPa was elucidated. In the 0–3 MPa range, the particle system exhibited significant displacement and strain, with a maximum Z-axis displacement of 0.1571 mm, a maximum Z-axis normal strain of 7.1%, and a maximum shear strain of 0.59%. As pressing progressed, both displacement and strain values decreased markedly. At 60 MPa, the Z-axis displacement diminished to 0.0098 mm, a reduction of 93.7%, and the Z-axis normal strain decreased to 0.04%, a reduction of 99.4%. At this final stage, displacement and strain values in all three directions approached zero, indicating the transition of the particle system into a continuous PBX compact. This study clarifies the evolutionary principles governing the mechanical behavior of the particle system during the transition from a loose state to a dense compact, facilitating a three-dimensional, quantitative, and dynamic analysis of the pressing process. Understanding the formation behavior of high-performance explosive particles during pressing holds substantial scientific and engineering significance.
Keywords:
TATB
Three-dimensional particle system
CT image processing
Digital volume correlation
Forming behavior
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