CAJ | 학술논문

为从理论上寻求典型硝酸酯炸药太安（ PETN）晶体的感度判据和力学性能，在NPT系综下，用COMPASS力场对PETN （4×3×4）超晶胞和沿其（100）晶面切割的两种模型，实施了5个温度（195，245，295，345，395 K）的周期性分子动力学（MD）模拟。结果表明，随温度升高，它们的引发键O-NO2的最大键长（ Lmax ）递增，引发键连双原子作用能（ EO-N ）和内聚能密度（CED）递减，与感度随温度升高而增大的实验事实相一致。 Lmax、EO-N和CED在一定条件下，确可用作高能物质热和撞击感度相对大小的理论判据。随温度升高，弹性系数与弹性模量递减，刚性减小，柔性递增，符合实验事实，表明，以切割分面模型进行MD模拟能获得较符合实际的确定结果。
위종이론상심구전형초산지작약태안（ PETN）정체적감도판거화역학성능，재NPT계종하，용COMPASS력장대PETN （4×3×4）초정포화연기（100）정면절할적량충모형，실시료5개온도（195，245，295，345，395 K）적주기성분자동역학（MD）모의。결과표명，수온도승고，타문적인발건O-NO2적최대건장（ Lmax ）체증，인발건련쌍원자작용능（ EO-N ）화내취능밀도（CED）체감，여감도수온도승고이증대적실험사실상일치。 Lmax、EO-N화CED재일정조건하，학가용작고능물질열화당격감도상대대소적이론판거。수온도승고，탄성계수여탄성모량체감，강성감소，유성체증，부합실험사실，표명，이절할분면모형진행MD모의능획득교부합실제적학정결과。
To explore theoretically the sensitivity criterion and the mechanical properties of PETN explosive crystal, molecular dy-namics (MD) simulation periodic at 195, 245, 295, 345,395 K for (4 ×3 ×4) super cells and its cutting model along (100) crystalline surface was conducted by COMPASS force field in the NPT ensemble.The results show that as the temperature increa-ses, the maximum bond length (Lmax) of their O-NO2 trigger bond increases, the interaction energy (EO-N) between O atom and N atom of the O-NO2 trigger bond decreases and the cohesive energy density ( CED) decreases.These results agree with the experimental fact that PETN becomes more sensitive as the temperature increases.The Lmax、EO-N and CED can be used as the the-oretical criteria to predict the heat and impact sensitivity under certain conditions .With increasing the temperature, the elastic co-efficients and elastic modulus decrease, the stiffness of PETN crystal decreases and the flexibility increases, which agrees with the experimental fact, indicating that the MD simulation of PETN cutting model is able to yield more concrete quantitative results.