RDX基铝纤维炸药静态压缩力学性能

为了提高RDX基含铝炸药的力学性能,用铝纤维替代含铝炸药中的铝粉制备了RDX基铝纤维炸药。进行了准静态力学实验,将得到的不同铝纤维含量的铝纤维炸药的弹性模量以及单轴抗压强度拟合计算,得到了铝纤维炸药弹性模量以及单轴抗压强度与铝纤维体积含量的关系表达式。结果表明,用拟合弹性模量实验数据得到的铝纤维的增强系数为8.19。铝纤维能显著增强铝纤维炸药的力学性能,其弹性模量、抗压强度以及残余强度随着铝纤维体积含量增加而增大。当铝纤维体积含量为0%~30%时,铝纤维炸药的临界应变随着铝纤维含量的增加而增大,当铝纤维体积含量高于30%时,铝纤维炸药的临界应变不随着铝纤维含量变化。采用正态分布函数,进行了铝纤维体体积含量为10%~40%的铝纤维炸药工程应力-应变曲线的拟合,其拟合的校正决定系数为0.987~0.998。体积分数小于38.1%的特定铝纤维含量的铝纤维炸药的单轴抗压强度可用拟定的关系式计算。

Static Compression Mechanical Properties of RDX Based Aluminum Fiber Explosive

To improve mechanical properties of RDX based aluminized explosives, the RDX based aluminum fiber explosive was prepared by replacing aluminum powder in aluminized explosive with aluminum fiber. The fitting calculation of the elastic modulus and uniaxial compression strength of aluminum fiber explosive with different content of aluminum fiber obtained by quasi-static compression mechanical experiment was carried out. The relation expression of the elastic modulus and compression strength with aluminum fiber volume content for aluminum fiber explosive was obtained. Results show that the reinforcement coefficient of aluminum fiber obtained by fitting experimental data of elastic modulus is 8.19. The aluminum fiber can significantly enhance the mechanical properties of aluminum fiber explosive. With increasing the aluminum fiber content, its elastic modulus, compression strength and residual strength of aluminum fiber explosive increase When aluminum fiber volume content is 0%-30%, the critical strain of aluminum fiber explosive increases. When aluminum fiber volume content is higher than 30%, the critical strain of aluminum fiber explosive does not change The fitting of the engineering stress-strain curves of aluminum fiber explosive with aluminum fiber volume content of 10%-40% is performed by a normal distribution function, its fitting correction coefficient of determination is 0.987-0.998. The uniaxial compression strength of aluminum fiber explosive with specific aluminum fiber content of less than 38.1% for volume fraction can be calculated by the proposed relation.