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Applicability Analysis of Hyperbolic Drucker-Prager Strength Criterion for TATB-based PBX
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Institute of Chemical Materials, CAEP, Mianyang 621999, China

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    Abstract:

    To accurately establish the strength criterion of TATB-based PBX materials, the strength data under different confining pressures (0-10 MPa) and different temperatures (22.5, 35, 50 ℃) were obtained through the self-developed active confining pressure tester. Based on the experimental data of uniaxial tension, uniaxial compression and confining pressure compression, traditional Drucker-Prager(D-P) and hyperbolic D-P strength criteria were used to establish the strength model of TATB-based PBX at different temperatures, and the prediction accuracy for experimental strength data was analyzed. Results show that the maximum relative errors of the hyperbolic D-P strength criterion at 22.5, 35 ℃ and 50 ℃ are 2.41%, 3.46% and 5.22%, respectively, and the root mean square errors are 0.42, 0.38 MPa, and 0.44 MPa, respectively, which are better than those of the traditional D-P strength criterion. The relative errors for the prediction of indirect triaxial tensile and compressive failure stress are 4.93% and 12.14% respectively and they are superior to the traditional D-P, Mohr-Column, twin shear and uniaxial strength criteria. The hyperbolic D-P strength criterion of considering the influence of middle principal stress and being everywhere regular, can accurately predict the strength characteristics of TATB-based PBX materials at different temperatures.

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袁洪魏,赵龙,董天宝,等. TATB基PBX双曲Drucker-Prager强度准则适用性分析[J].含能材料,2019,27(1):74-78.
YUAN Hong-wei, ZHAO Long, DONG Tian-bao, et al. Applicability Analysis of Hyperbolic Drucker-Prager Strength Criterion for TATB-based PBX[J]. Chinese Journal of Energetic Materials,2019,27(1):74-78.

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History
  • Received:April 18,2018
  • Revised:October 10,2018
  • Adopted:June 20,2018
  • Online: September 06,2018
  • Published: January 25,2019