典型浇注PBX炸药的准静态压缩力学行为-《爆破器材》

文章信息/Info

Title:: Mechanical Behaviors of Typical Casting-PBX Explosives under Quasi-Static Compression

Author(s):: XI Peng; SUN Peipei; ZHENG Yafeng; NAN Hai; PAN Wen; Xi’an Modern Chemistry Research Institute (Shaanxi Xi’an, 710065)

摘要:: 采用定应变压缩试验研究了准静态压缩条件下浇注PBX炸药(浇注型高聚物黏结炸药)的力学行为，测试了典型浇注炸药PBX-1在损伤前、后的性能，获得了炸药的真应力-应变曲线。试验结果表明，浇注PBX炸药在准静态压缩条件下的力学行为分为接触压缩、弹性变形、损伤破坏和应变软化4个阶段。在压缩应变不超过损伤应变时，PBX-1炸药主要以弹性变形为主，屈服强度和屈服应变没有发生明显改变；在压缩应变超过损伤应变后，炸药中黏结剂断裂，颗粒脱黏，发生塑性变形。压缩应变增加至8%后，PBX-1炸药密度降低，残余应变增大；PBX-1炸药的屈服强度为0.6 MPa，屈服应变为10.6%，损伤应变为8%，炸药的损伤应变可以作为强度校核的依据。

Abstract:: Mechanical behaviors of casting-PBX explosives under the quasi-static compression were studied by constant strain compression test. Properties of PBX-1, a typical casting explosive, were tested before and after its damage. The tress-strain curves of PBX-1 were obtained. The results show that the distortion of casting-PBX explosives under quasi-static compression can be divided into four stages: contact compression, elastic deformation, damage and fracture, and strain softening. When the compression strain is less than the damage strain, explosive PBX-1 mainly presents the elastic deformation, and the yield strength and the yield strain nearly unchange. When the compression strain is more than the damage strain, binder in PBX-1 fractures and the particles debond from the binder, which can result in the plastic deformation of the explosive. Density declines and residual strain increases when the compression strain of the explosives increases to more than 8%. Yield strength, yield strain, and damage strain of the PBX-1 are 0.6 MPa, 10.6%, and 8%, respectively. The damage strain of explosive can be used as the basis of the strength check.