Influence of strain rate on the compressive yield stress of CMDB propellant at low,intermediate and high strain rates |
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| Institution: | 1. Institut de Recherche en Génie Civil et Mécanique, LUNAM Université, UMR CNRS 6183, École Centrale de Nantes, 1 rue de la Noë BP 92101, 44321 Nantes cedex 3, France;2. Mechanical Engineering Department, Faculty of Engineering, King Abdulaziz University, P.O. Box 80248, Jeddah 21589, Saudi Arabia;1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;1. Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Agency for Defense Development, Advanced Propulsion Technology Center, Republic of Korea |
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| Abstract: | The mechanical properties of composite modified double base (CMDB) propellant significantly depend on the strain rate. In particular, the yield stress increases dramatically at higher strain rates. To study this behaviour, low, intermediate and high strain rate compression testing (1.7 × 10?4 to 4 × 103 s?1) of CMDB propellant at room temperature was conducted by using a universal testing machine, a hydraulic testing machine and a split Hopkinson pressure bar (SHPB) system, respectively. The yield stress was observed to increase bilinearly with the logarithm of strain rate, with a sharp increase in slope at a strain rate of 5 × 101 s?1, which was supported by dynamic mechanical analysis (DMA) testing. The Ree-Eyring model, involving two rate-activated processes, was employed to predict the yield behaviour of CMDB propellant over a wide range of strain rates. The predictions are in excellent agreement with the experimental data. |
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| Keywords: | Composite propellant Intermediate strain rate Compression Yield behaviour Properties and characterisation |
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