Study on the State of Internal Stress and Strain of TATB-based Polymer Bonded Explosive Using Strain Markers and Cone-Beam Computed Tomography
Study on the State of Internal Stress and Strain of TATB-based Polymer Bonded Explosive Using Strain Markers and Cone-Beam Computed Tomography
复制标题
利用应变标记和锥形束计算机断层扫描研究TATB基聚合物粘结炸药的内应力和应变状态
DOI：
10.22211/cejem/76335
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发表时间：
2017
影响因子：
0.8
通讯作者：
Tian Yong
中科院分区：
文献类型：
--
作者：
Dai Bin;Lan Lin gang;Zhang Wei bin;Tian Yong
精确测量高聚物粘结炸药（PBX）颗粒在模压成型过程中的内部结构应变是研究PBX颗粒内部应力分布场及其产生机理，提高应力分布均匀性的重要手段。本文以TATB基（1，3，5-三氨基-2，4，6-三硝基苯）PBX为原料，研究了温压成型过程中PBX颗粒的应力-应变状态。在不同位置植入应变标记，通过X射线显微断层扫描，获得植入后球形应变标记的变形特征和规律。从而得到不同位置的局部应变状态，进而推断局部应力状态。结果表明，所有应变标志都发生了轴对称变形，扁平应变椭球主要是单轴压缩。在中心区域，应力主要沿轴向分布，剪切力较小。在圆柱形晶粒的周围区域不仅存在轴向应力，而且存在大的剪切应力。中心区域的应力梯度大于周围区域。应力在周围区域更大，因为该区域被模具挤压。最大应变度比最小应变度大44.8%。量化了各区域的局部应力增量。三个轴向的应力增量在14.2-19.5 MPa范围内。研究了定量评价PBX颗粒内部应力-应变状态的可行性，这对确定成型过程中PBX颗粒内部应变和应力分布具有重要意义。
Precise measurement of the inner structural strain of polymer bonded explosive (PBXs) granules during compression molding is highly desirable in order to investigate the inner stress distribution field and its underlying generation mechanism, with the aim of improving the stress distribution uniformity. In this contribution, TATB-based (1,3,5-triamino-2,4,6-trinitrobenzene) PBX granules were formulated and the stress-strain state of the PBX granules during the warm molding process was analyzed. Strain markers were implanted at different locations and the deformation characteristics and regularity of the embedded spherical strain markers were obtained by X-ray micro-tomography. Thus the local strain states at different locations could be obtained, and the local stress state could be deduced. The results showed that axisymmetric deformation occurred in all of the strain markers, where the flat strain ellipsoids were mainly compressed uni-axially. In the central region, the stress was mainly in an axial direction, and the shear force was small. Not only axial stresses, but also large shear stresses in the surrounding region of the cylindrical grains were present. The stress gradient in the central region was greater than that in the surrounding region. The stress was greater in the surrounding region because this region was squeezed by the mold. The maximum strain degree was 44.8% larger than the minimum strain degree. The local stress increment in each region was quantified. The stress increments of the three axes were in the range 14.2-19.5 MPa. This study examined the feasibility of evaluating the inner stress–strain state of PBX granules in a quantitative manner, which is significant in determining the inner strain and stress distribution in PBX granules during the molding process.