DNAN基熔铸炸药的动态力学行为及点火特性OA北大核心
Dynamic Mechanical Behavior and Ignition Characteristics of DNAN-Based Melt-Cast Explosives
为研究某 2,4-二硝基苯甲醚(2,4-dinitroanisole,DNAN)基熔铸炸药的动态力学行为和点火特性,基于万能材料试验机和分离式霍普金森压杆(split Hopkinson pressure bar,SHPB)分别开展准静态/动态压缩试验和被动围压试验,并开展落锤冲击点火试验,结合扫描电镜和工业计算机断层扫描观察加载前、后试样的形貌特征,获得了不同加载条件下DNAN基熔铸炸药的应力-应变曲线、点火阈值和损伤特征,揭示了炸药在不同条件下的动态力学行为、点火特性和损伤机制.结果表明:DNAN基熔铸炸药的动态力学行为具有应变率相关性,相较于典型压装炸药,脆性特征更明显,在单轴压缩状态下强度更低,多轴压缩状态下峰值应力接近;孔洞为该炸药的主要初始损伤形式,压缩加载下孔洞被填充压实,主要损伤机制为穿晶断裂、界面脱粘,压剪耦合加载下装药内发生剪切流动,颗粒重新排布,随着加载强度的增大,主要损伤机制由沿晶断裂转向穿晶断裂;落锤冲击点火试验中DNAN基熔铸炸药对压缩加载更敏感,压缩和压剪加载下的最大未反应落高和峰值应力分别为 500 mm、556 MPa和 600 mm、622 MPa,主要点火机制可能是由孔洞损伤受压缩引起的气泡绝热压缩或孔洞冲击塌缩生热.
In order to study the dynamic mechanical behavior and ignition characteristics of a DNAN-based melt-cast explosive,quasi-static and dynamic compression tests,as well as passive confining pressure tests were carried out using a universal material testing machine and a split Hopkinson pressure bar(SHPB).Impact ignition test was carried out using a drop hammer.Scanning electron microscope(SEM)and industrial computed tomography(CT)were used to examine the morphology changes in the samples before and after loading.The stress-strain curves,ignition thresholds and damage characteristics of DNAN-based melt-cast explosive under different loading conditions were obtained.The dynamic mechanical behavior,ignition characteristics and damage mechanism of the explosive under different loading conditions were obtained.The results show that the dynamic mechanical behavior of the DNAN-based melt-cast explosive exhibits a strain-rate dependence,demonstrating more pronounced brittleness compared to typical press-loaded explosives,lower strength under uniaxial compression,and peak stresses comparable to those observed in multi-axial compression.The holes are the main initial damage form of the explosive.The holes are filled and compacted under compressive loading.The main damage mechanisms are transgranular fracture and interfacial debonding.Under coupled compress-shear loading,shear flow occurs in the charge and the particles are rearranged.With the increase of loading strength,the main damage mechanism changes from intergranular fracture to transgranular fracture.In the drop-weight impact ignition test,DNAN-based melt-cast explosives are more sensitive to compression loading.The maximum unreacted drop heights and peak stresses under compress and compress-shear loading are 500 mm,556 MPa and 600 mm,622 MPa,respectively.The primary ignition mechanism is likely attributable to either the adiabatic compression of bubbles or the thermal energy generated by the impact collapse of voids resulting from compressive damage.
赵东;屈可朋;胡雪垚;何娜;王奕鑫;肖玮
西安近代化学研究所,陕西 西安 710065西安近代化学研究所,陕西 西安 710065西安近代化学研究所,陕西 西安 710065西安北方惠安化学工业有限公司,陕西 西安 710302西安近代化学研究所,陕西 西安 710065西安近代化学研究所,陕西 西安 710065
力学
DNAN基熔铸炸药力学行为冲击加载点火特性损伤机制
2,4-dinitroanisole-based melt-cast explosivemechanical behaviorimpact loadingignition characteristicsdamage mechanism
《高压物理学报》 2025 (5)
25-35,11
国防重大基础研究专项
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