李东伟 , 苗飞超 , 张向荣 , 等 . 2,4-二硝基苯甲醚基不敏感熔注炸药动态力学性能 [J ] . 兵工学报 , 2021 , 42 ( 11 ): 2344 - 2349 . DOI: 10.3969/j.issn.1000-1093.2021.11.007 http://doi.org/10.3969/j.issn.1000-1093.2021.11.007 炸药动态力学性能是影响其安定性的重要因素。为揭示2，4-二硝基苯甲醚（DNAN）基不敏感熔注炸药的动态力学性能特征，采用分离式霍普金森压杆（SHPB）实验对DNAN基不敏感抗过载熔注炸药的动态力学性能进行研究。通过入射波整形技术，实现了低阻抗、低强度的熔注炸药材料在SHPB实验中的应力平衡和恒应变率加载，得到65 s^-1、130 s^-1和200 s^-1等3种应变率下炸药的应力应变曲线；基于炸药应力应变数据，利用改进的Lesuer标定方法，获得该炸药的Johnson- Cook本构模型参数。结果表明：随着应变率的提高，该炸药失效应力逐渐增加，具有明显的应变率效应；拟合得到的Johnson-Cook动态本构模型能较好地预测该炸药在冲击载荷作用下的力学响应。

LI D W , MIAO F C , ZHANG X R , et al . Dynamic mechanical properties of an insensitive DNAN-based melt-cast explosive [J ] . Acta Armamentarii , 2021 , 42 ( 11 ): 2344 - 2349 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.11.007 http://doi.org/10.3969/j.issn.1000-1093.2021.11.007 The dynamic mechanical properties of explosives are important to their stability. In order to reveal the dynamic mechanical properties of insensitive 2, 4-dinitroanisole (DNAN)-based melt-cast explosives，the dynamic behavior of an insensitive DNAN-based melt-cast explosive for penetrating warhead was investigated by split Hopkinson pressure bar experiment. The stress equilibrium and constant strain rate of the explosive materials with low impedance and low strength were achieved by using the pulse shaper technique in the SHPB test，and the stress-strain curves of the explosives at the strain rates of 65 s^-1，130 s^-1 and 200 s^-1 were obtained. Based on the experimental data obtained，the Johnson-Cook constitutive model parameters for the explosive was proposed by an improved Lesuer’s approach. The parameters of Johnson-Cook constitutive model are A=1.70 MPa，B=11.37 MPa，C=0.93，and n=0.49. The results show that the failure stress of the explosive increases with the increase in strain rate，and the explosive has significant strain rate effect. The Johnson-Cook constitutive model can be used to predict the mechanical responses of the explosive under impact load.

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SONG B , CHEN W N . One-dimensional dynamic compressive behavior of EPDM rubber [J ] . Journal of Engineering Materials and Technology , 2003 , 125 ( 3 ): 294 - 301 . DOI: 10.1115/1.1584492 http://doi.org/10.1115/1.1584492 https://asmedigitalcollection.asme.org/materialstechnology/article/125/3/294/445466/OneDimensional-Dynamic-Compressive-Behavior-of https://asmedigitalcollection.asme.org/materialstechnology/article/125/3/294/445466/OneDimensional-Dynamic-Compressive-Behavior-of Dynamic compressive stress-strain curves at various strain rates of an Ethylene-Propylene-Diene Monomer Copolymer (EPDM) rubber have been determined with a modified split Hopkinson pressure bar (SHPB). The use of a pulse-shaping technique ensures that the specimen deforms at a nearly constant strain rate under dynamically equilibrated stress. The validity of the experiments was monitored by a high-speed digital camera for specimen edge deformation, and by piezoelectric force transducers for dynamic stress equilibrium. The resulting dynamic stress-strain curves for the EPDM indicate that the material is sensitive to strain rates and that the strain-rate sensitivity depends on the value of strain. Based on a strain energy function theory, a one-dimensional dynamic constitutive equation for this rubber was modified to describe the high strain-rate experimental results within the ranges of strain and strain rates presented in this paper.

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XU M , WILLE K . Numerical investigation of the effects of pulse shaper, lateral inertia, and friction on the calculated strain-rate sensitivity of UHP-FRC using a split Hopkinson pressure bar [J ] . Journal of Materials in Civil Engineering , 2016 , 28 ( 11 ): 04016 114.

NEMAT-NASSER S , ISAACS J B , STARRETT J E . Hopkinson techniques for dynamic recovery experiments [J ] . Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences , 1991 , 435 ( 1894 ): 371 - 391 . DOI: 10.1098/rspa.1991.0150 http://doi.org/10.1098/rspa.1991.0150 https://royalsocietypublishing.org/doi/10.1098/rspa.1991.0150 https://royalsocietypublishing.org/doi/10.1098/rspa.1991.0150 \n Novel techniques are introduced to render the classical split Hopkinson bar apparatus suitable for dynamic\n recovery\n experiments, where samples can be subjected to a single pulse of pre-assigned shape and duration, and then recovered without any additional loading, for post-test characterization; i. e., techniques for fully controlled unloading in Hopkinson bar experiments. For compression dynamic recovery tests, the new design generates a compressive pulse trailed by a tensile pulse (stress reversal), travelling toward the sample. Furthermore, all subsequent pulses which reflect off the free ends of the two bars (incident and transmission) are rendered tensile, so that the sample is subjected to a single compressive pulse whose shape and duration can also be controlled. For tension recovery experiments, the new design provides for trapping the compression pulse reflected off the sample, and the tensile pulse transmitted through the sample. In addition, a sample can be subjected to compression followed by tension, and then recovered, allowing the study of, e. g. the dynamic Bauschinger effect in materials.\n

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