Elbeih, A., Abdelhafiz, M., Hussein, A., Wafy, T., Elshenawy, T., Baraka, A., Elsayed, M., Gobara, M. (2019). Characteristics of a paste explosive (EPX-P20) used in explosive bolts for spacecraft’s applications. test, 18(18), 1-7. doi: 10.1088/1757-899X/610/1/012039
Ahmed Elbeih; Mahmoud Abdelhafiz; Ahmed K. Hussein; Tamer Z. Wafy; Tamer Elshenawy; Ahmad Baraka; Mohamed A. Elsayed; Mohamed Gobara. "Characteristics of a paste explosive (EPX-P20) used in explosive bolts for spacecraft’s applications". test, 18, 18, 2019, 1-7. doi: 10.1088/1757-899X/610/1/012039
Elbeih, A., Abdelhafiz, M., Hussein, A., Wafy, T., Elshenawy, T., Baraka, A., Elsayed, M., Gobara, M. (2019). 'Characteristics of a paste explosive (EPX-P20) used in explosive bolts for spacecraft’s applications', test, 18(18), pp. 1-7. doi: 10.1088/1757-899X/610/1/012039
Elbeih, A., Abdelhafiz, M., Hussein, A., Wafy, T., Elshenawy, T., Baraka, A., Elsayed, M., Gobara, M. Characteristics of a paste explosive (EPX-P20) used in explosive bolts for spacecraft’s applications. test, 2019; 18(18): 1-7. doi: 10.1088/1757-899X/610/1/012039

Characteristics of a paste explosive (EPX-P20) used in explosive bolts for spacecraft’s applications

International Conference on Aerospace Sciences and Aviation Technology
Article 41, Volume 18, Issue 18, April 2019, Pages 1-7    PDF (467.07 K)
Document Type: Original Article
DOI: 10.1088/1757-899X/610/1/012039
Authors
Ahmed Elbeih1; Mahmoud Abdelhafiz1; Ahmed K. Hussein1; Tamer Z. Wafy1; Tamer Elshenawy2; Ahmad Baraka1; Mohamed A. Elsayed1; Mohamed Gobara1
1Military Technical College, Kobry Elkobbah, Cairo, Egypt.
2Technical Research Center, Cairo, Egypt.
Abstract
An explosive charge, located within a machined cavity in a bolt, provides the energetic stimulus required for cleanly bolt fracture. The shock wave produced fom the explosion causes tensile fracture along the bolt itself with minumum fragmentation and helps to control the separation process of the satellite from its rocket. In this study, EPX-P20 is a paste explosive in the research stage. EPX-P20 is based on PETN (pentaerythritol tetranitrate) bonded by polydimethyl-siloxane binder matrix. A computerizing mixer plastograph was used for the production of EPX-P20. The internal energy of combustion was measured and used to determine the enthalpy of formation. Sensitivity against both friction and impact stimuli were determined. The detonation properties were calculated theoretically using the EXPLO 5 soft code, while the detonation velocity was determined experimentally. For comparison, several commercial available explosives such as; Sprängdeg m/46, Formex P1, Semtex 10 and EPX-1 were investigated. It was proven that EPX-P20 possesses the lowest velocity of detonation while maintaining its very low sensitivity. Interesting inversely proportion relationship amongst the measured internal energy of combustion and the calculated heat of detonation was observed. The produced paste explosive might be used in explosive bolt for space craft’s applications.
Keywords
plastic explosives; sensitivity; combustion; detonation
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