To study the influence rule of particle size of micro-nano RDX on its shock sensitivity,the underwater shock sensitivity of RDX samples with average granularity of 80nm,300nm,350nm,550nm,was determined by combining small cardboard test with underwater explosion experiment.The results show that with increasing particle size of the micro-nano RDX,the 50％ probability gap diaphragm thickness of underwater explosion grows up,which means RDX shock sensitivity is getting more sensitive,as the charge condition is the same.In the particle size range of 80nm to 550nm,the relationship of RDX particle size vs.the values of 50％ probability gap diaphragm thickness is y=0.00379x+8.236,its linear correlation coefficient is 0.980.%为了研究微纳米RDX粒度对冲击波感度的影响规律,采用隔板试验与水中爆炸测试相结合的方法测定了中位径d50分别为80、300、350、550 nm RDX的水下冲击波感度.结果表明,在装药条件相同时,随着RDX粒度的增大,其水下爆炸50％爆发概率隔板厚度值增加,即冲击波感度增大.在该粒度区间,RDX的粒度(x)与50％爆发概率隔板厚度值(y)间的关系式为y=0.00379x+8.236,线性相关系数为0.980.
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