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含能材料  2015 

TATB造型颗粒模压结构演变的X射线层析成像

DOI: 10.11943/j.issn.1006-9941.2015.10.012

Keywords: TATB造型颗粒 模压 结构演变 X射线层析成像

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Abstract:

利用X射线层析成像技术结合内置变形材料的形变特征, 研究了TATB造型颗粒压制过程中颗粒变形和结构演变。CT图像显示:中部颗粒主要发生向下的压实变形, 模具壁附近颗粒向下压实同时还会发生拱起变形; 孔隙率变化主要发生在压制初期, 即0~10 MPa压力下, 上、中、下各部位(分别距顶面5,20,35 mm处)孔隙率分别减少了73%,62%和58%, 压制各阶段孔隙率沿轴向由上至下递增; 颗粒主要在压制方向(轴向)发生位移, 模具与颗粒间的摩擦力大于颗粒间摩擦力, 中部的颗粒向下发生较大位移。结果表明, X射线层析成像可无损表征造型颗粒受压过程内部结构演变, 颗粒形态变化和相互接触关系揭示了受压颗粒间作用模式, 颗粒位移间接反映了炸药内部应力传递情况

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