RDX晶体的破碎与细观断裂行为  

Ruptures and Mesoscale Fracture Behaviors of RDX Crystals

作　　者：李明[1] 陈天娜[1] 庞海燕[1] 黄明[1] 

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621900

出　　处：《含能材料》2013年第2期200-204,共5页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(10832003)

摘　　要：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。The ruptures of RDX crystalline particles in ensembles and mesoscale fracture behaviors of bulk single crystal are presented in this work. First, the particles ruptures of 3 types RDX ensembles subjected to quasi-static compression were investigated. The rupture ratio was defined to describe the coherence strength of crystalline particles. The rupture ration of commercial coarse RDX lot is 1.57 which is much higher than that of re-crystallized lot with 1.47 and, the spheroidized RDX lot bears the minimum ration of 1.17 which shows the highest resistance to rupture. In the case of the nanoindentation of a bulk single RDX crystal, the regular pop in events on face （210） were reported in this work. Through the nanoindention tests, the yield stress or fracture initiation stress of RDX was obtained as 465 MPa, which is far below the hardness of 550 MPa. The mean fluctuation stress on the loading/unloading curve is calculated as approximately 8 MPa and the corresponding indentation depth on the （210） face is 1 micrometer and the implication of the depth is discussed.

关 键 词：材料力学 RDX晶体 颗粒破碎 细观断裂 纳米压痕 

分 类 号：TQ560.1[化学工程—炸药化工]