Study of Mechanical Properties of Naturally Aged Double Base Rocket Propellants

• Autorzy: Sućeska M. , Matečić Mušanić S. , Fiamengo I. , Bakija S. , Bakić A. , Kodvanj J.
• Języki publikacji: EN

Abstrakty

EN

Various chemical reactions and physical processes (such as stabilizer consumption, migration and evaporation of nitroglycerine, decomposition of nitroglycerine and nitrocellulose, etc.) take place in double based rocket propellants grains over the time, even under ambient storage conditions. The overall effect of these reactions and processes are changes of physical, chemical, thermal, ballistic and mechanical properties of rocket propellants with storage time, i.e. the reduction of the propellants performances and safe service life. The aim of this work was to evaluate the mechanical changes of rocket propellants – sustainers, built in in-service antitank guided missiles systems, induced by natural ageing at ambient conditions during up to 35 years of storage. The mechanical and viscoelastic properties were tested using a dynamic mechanical analyser, an uniaxial tensile and compression tester, and a notch toughness tester. The results have shown that the changes of the studied mechanical and viscoelastic properties are evident, although the results of the tests are rather scattered (as a consequence of measuring uncertainty, different ageing histories of propellants, etc.) or changes of some properties are not too pronounced. For example, after 15 years of storage at ambient conditions the glass transition temperature increases for about 5 C, the tan δ in the glass transition region decreases for about 5%, the storage and loss modulus at 25 °C increase for about 15%, Young modulus at 23 C increases up to 30%, the notch toughness at -30 C decreases up to 15%, etc. Along with these tests, the stabilizer content determination and proving ground ballistic tests were also done.

Słowa kluczowe

EN

mechanical properties; rocket propellant; natural ageing; dynamic mechanical analysis; tensile test

• Wydawca: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2010
• Tom: Vol. 7, nr 1
• Strony: 47--60
• Opis fizyczny: Bibliogr. 18 poz.

Twórcy

autor

Sućeska M.

autor

Matečić Mušanić S.

autor

Fiamengo I.

autor

Bakija S.

autor

Bakić A.

autor

Kodvanj J.

• Brodarski Institute - Marine Research & Advanced Technologies, Av. V. Holjevca 20, 10020 Zagreb, Croatia,

Bibliografia

• [1] Bohn M.A, Kinetic Modelling of the Ageing of Gun and Rocket Propellants for the Improved and Time-Extended Prediction of Their Service Lifetime, Proc. 4th Life Cycles of Energetic Materials Conference, Fullerton, USA, 1998, pp. 1-38.
• [2] Vogelsanger B., Chemical Stability, Compatibility and Shelf Life of Explosives, Chimia, 2004, 58, 401-408.
• [3] Bohn M.A., Volk F., Ageing Behaviour of Propellants Investigated by Heat Generation, Stabiliser Consumption, and Molar Mass Degradation, Propellants, Explos., Pyrotech., 1992, 17, 171-178.
• [4] Bohn M.A., Kinetic Modelling of the Concentrations of the Stabiliser DPA and Some of Its Consecutive Products as Function of Time and Temperature, J. Therm. Anal. Cal., 2001, 65, 103-120.
• [5] Bohn M.A., Prediction of Life Times of Propellants – Improved Kinetic Description of the Stabiliser Consumption, Propellants, Explos., Pyrotech., 1994, 19, 266-269.
• [6] Rogers R.R., Rogers J.L., Explosive science, Los Alamos, NM. http://home.att. net/~mrogers, 2002.
• [7] Dodds J.S., Current UK Procedure for Propellant Shelf-life Determination, Proc. 9th Symp. Chem. Probl. Connected Stabil. Explos., Margretetorp, 1992, pp. 247-258.
• [8] Sućeska M., Matečić Mušanić S., Rajić M., Determination of Arrhenius Kinetic Constants for DB Propellants by Nonisothermal DSC Measurements. Influence of Some Testing Conditions, Proc. 6th Int. Seminar “New Trends in Research of Energetic Materials”, Pardubice, Czech Republic, 2003, pp. 374-391.
• [9] Sućeska M., Rajić M., Thermal Characterisation of Stable and Unstable Nitrocellulose Propellant, Proc. 33rd Int. Annual Conference of ICT, Karlsruhe, ICT, 2002, pp. 98.1-98.17
• [10] Rajić Linarić M., Sućeska M., Matečić Mušanić S., Changes of Some Thermophysical Properties of Nitrocellulose Propellants During Accelerated Aging, Proc. 8th Int. Seminar “New Trends in Research of Energetic Materials”, Pardubice, Czech Republic, 2005, pp. 758-764.
• [11] Ammunition Surveillance Procedures (Draft version), Croatian MoD, 2001.
• [12] Determination of Chemical Stability of Propellants, Croatian Standard, HVN 8069/91, 1992 (in Croatian).
• [13] STANAG 4540 – Explosives, Procedures for Dynamic Mechanical Analysis and Determination of Glass TransitionTemperature.
• [14] STANAG 4443 – Explosives, Uniaxial Compression Test.
• [15] STANAG 4506 – Explosives, Uniaxial Tension Test.
• [16] STANAG 4117 – Stability Test Procedures and Requirements for Propellants Stabilised with Diphenylamine, Ethyl Centralite, or Mixture of Both.
• [17] AOP – 48 – Explosives, Nitrocellulose Based Propellants – Stability Test Procedures and Requirements Using Stabilizer Depletion.
• [18] Matečić Mušanić S., Sućeska M., Bakija S., Applicability of Dynamic Mechanical Analysis and Thermal Methods in Investigation of Ageing Proceses of Double Base Rocket Propellants, Proc. 9th Int. Seminar “New Trends of Energetic Materials”, Pardubice, Czech Republic, 2006, pp. 214-230.