Refractive Imaging of Air Shock Above Microscale Defects in Pentaerythritol Tetranitrate (PETN) Films,Propellants, Explosives, Pyrotechnics

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Refractive Imaging of Air Shock Above Microscale Defects in Pentaerythritol Tetranitrate (PETN) Films
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-10-14 , DOI: 10.1002/prep.202000029
Julio C. Peguero _{1,

2} , Eric C. Forrest ₁ , Robert Knepper ₁ , Michael J. Hargather ₂ , Alexander S. Tappan ₁ , Michael P. Marquez ₁ , Jonathan G. Vasiliauskas ₁ , Stephen G. Rupper ₁

Affiliation

Physical vapor deposition (PVD) of high explosives can produce energetic samples with unique microstructure and morphology compared to traditional powder processing techniques, but challenges may exist in fabricating explosive films without defects. Deposition conditions and substrate material may promote microcracking and other defects in the explosive films. In this study, we investigate effects of engineered microscale defects (gaps) on detonation propagation and failure for pentaerythritol tetranitrate (PETN) films using ultra‐high‐speed refractive imaging and hydrocode modelling. Observations of the air shock above the gap reveal significant instabilities during gap crossing and re‐ignition.

中文翻译：

季戊四醇四反磷酸酯（PETN）薄膜中微小缺陷上方的空气冲击的折射成像。

与传统的粉末处理技术相比，高炸药的物理气相沉积（PVD）可以产生具有独特的微观结构和形态的高能样品，但在制造无缺陷的炸药膜时可能会遇到挑战。沉积条件和基材可能会促进爆炸膜中的微裂纹和其他缺陷。在这项研究中，我们使用超高速折射成像和液压编码模型研究了工程化的微观缺陷（间隙）对季戊四醇四硝酸盐（PETN）膜的爆轰传播和破坏的影响。对间隙上方的空气冲击的观察表明，间隙穿越和重新点火期间存在明显的不稳定性。

更新日期：2020-10-14

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