Determining shock reponse of PETN-based explosives with grain-scale simulations

Kosiba, Graham; Springer, H. Keo; Shaw, William L.; Gee, Richard H.

doi:10.1063/12.0000954

Cited by 2 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The viability of assuming homogeneity for RUS measurements on macroscopic samples with mesoscopic inhomogeneity has been demonstrated previously, 21 given an adopted rule of thumb that the wavelength of the propagating ultrasonic wave is much greater than the length scale of inhomogeneity. For PETN-based materials, grain sizes are much smaller than 1 mm, 5,22 which is much less than the wavelength of ultrasound used for RUS measurements in this study (approximately a few mm).…”

Section: Demonstrating Resonant Ultrasound Spectroscopy As a Viable T...mentioning

confidence: 85%

Demonstrating resonant ultrasound spectroscopy as a viable technique to characterize thermally conditioned high explosive materials

Lum,

Stobbe,

Mirkarimi

et al. 2024

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

We present results of resonant ultrasound spectroscopy (RUS) measurements applied to granular high explosive materials at different bulk pressing densities and degree of thermal conditioning. The material chosen in this study is a ubiquitously used explosive material known as pentaerythritol tetranitrate (PETN), which is used commercially in civil and defense applications both as a binderized plastic bonded explosive material and an unbinderized neat material. However, changes in granular PETN bulk elastic properties due to thermal conditioning, which could have implications for better understanding environmental aging-related effects, have not been well studied even though it is believed that elasticity may play an important role in explosive material initiation mechanisms. Furthermore, monitoring elastic property changes in granular explosive pressings has not yet been demonstrated using RUS, which is an appealing non-destructive characterization tool that requires only dry point contact with the explosive material. To this end, we report the first study using RUS to quantify the elastic properties of binderized and neat PETN pressings as well as to quantify changes in elastic properties as a function of both thermal conditioning and bulk pressing density. Elastic stiffness coefficients, sometimes more commonly referred to as elastic constants, calculated from the RUS measurements on the different PETN-based materials show a significant increase for the post-conditioned samples compared to the pre-conditioned samples. This trend of increasing elastic properties with thermal conditioning was consistent for different density pressings, different thermal exposure conditions, and even different neat PETN pressings of differing average crystal sizes and/or specific surface areas.

show abstract

Section: Demonstrating Resonant Ultrasound Spectroscopy As a Viable T...mentioning

confidence: 85%