Wide range temperature-dependent deformation and fracture mechanisms for 8701 under dynamic and static loading

Although the RDX-based composite explosive 8701 explosive 8701 has been widely used to achieve military goals, its mechanical properties have not been carefully investigated. In the present study, we focused on the mechanical response of 8701 at a wide range temperature from −125 °C to 100 °C under...

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Bibliographic Details
Published in:RSC advances 2018-01, Vol.8 (26), p.14293-14299
Main Authors: Guo, Hong-fu, Wu, Yan-qing, Huang, Feng-lei
Format: Article
Language:English
Subjects:
Chemistry
Debonding
Deformation
Deformation mechanisms
Fracture mechanics
Glass transition temperature
Mechanical analysis
Mechanical properties
Modulus of elasticity
RDX
Scanning electron microscopy
Softening
Storage modulus
Strain rate
Temperature
Temperature dependence
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Summary:Although the RDX-based composite explosive 8701 explosive 8701 has been widely used to achieve military goals, its mechanical properties have not been carefully investigated. In the present study, we focused on the mechanical response of 8701 at a wide range temperature from −125 °C to 100 °C under both quasi-static (about 0.001 s −1 ) and high-rate compression loading (about 600 s −1 ). The stress-strain curves exhibit different tendencies at different temperatures for both quasi-static and high strain-rate loading. The failure stress and elastic/storage modulus present important temperature-dependence. Differential scanning calorimetry (DSC) tests showed that the glass transition temperature and softening temperature of 8701 are 11.61 °C and 15.14 °C respectively, which is lower than that of the binder (with glass transition temperature of 25 °C and softening temperature 38 °C). For the quasi-static loading, scanning electron microscopy (SEM) observations revealed that 8701 shows an interface debonding failure mode along the binder phase below 15 °C, while the mechanical behavior of 8701 is dominated by softening behavior of the binder above 38 °C. For high-rate loading, 8701 shows a mixture of interface debonding and trans-granular cleavage when below 15.14 °C. The mechanical properties of 8701 were tested over a wide temperature range of −125 °C to 100 °C using the MTS Landmark hydraulic servo test system and SHPB.
ISSN:2046-2069
2046-2069
DOI:10.1039/c8ra01169a