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含能材料  2013 

RDX晶体的破碎与细观断裂行为

Keywords: 材料力学,RDX晶体,颗粒破碎,细观断裂,纳米压痕

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Abstract:

研究了RDX晶体颗粒集合体的破碎以及单晶体的细观断裂行为。对三种RDX晶体颗粒的压制响应行为进行了研究,通过定义破碎比来描述晶体的凝聚强度和破碎程度。实验测定表明,商业级粗原料颗粒破碎比最高,约为1.53,最易破碎,而重结晶颗粒为1.47,球形化颗粒的破碎比最小,为1.17,最不易破碎。在压痕试验中,研究首次报道了RDX(210)面上的规则跳突现象。根据加载卸载曲线,计算了RDX的屈服应力为465MPa,远低于压痕试验测定的硬度值550MPa,进一步计算了加载卸载曲线的振荡应力幅值为8MPa,其对应的压入深度为1μm,即RDX晶体(210)面上规则跳突现象发生在约为1μm的深度范围,文中讨论了这一深度值的意义。

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