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基于拉剪加载试验的NEPE推进剂强度准则
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火箭军工程大学智剑实验室, 陕西 西安 710025

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国家自然科学基金(11772352,22205259)


A Strength Criterion of NEPE Propellant Based on Tensile-shear Load Tests
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Zhijian Laboratory, Rocket Force University of Engineering, Xi′an 710025, China

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    摘要:

    为研究应变率和拉剪角度对NEPE推进剂拉剪强度的影响,采用拉剪夹具和蝶形试验件开展了推进剂在5个拉剪角度(0°、30°、45°、60°、90°)和5个应变率下(0.0012、0.0048、0.024、0.12、1 s-1)的拉剪试验,获得了推进剂在拉剪复合加载作用下拉剪强度随拉剪角度和应变率的变化规律;基于试验结果,利用改进的圆型方程对推进剂的拉剪强度极限进行了描述;并结合双剪统一强度理论,建立了不同应变率下推进剂拉剪强度准则,绘制了相应的推进剂统一强度理论极限面;最后利用建立的推进剂拉剪强度准则来预测了拉剪角度15°和75°下0.12 s-1和1 s-1应变率的拉剪强度,通过将预测结果与试验数据进行对比,来验证所建拉剪强度准则的有效性。研究表明,随着拉剪角度和应变率的增大,在拉剪复合加载作用下的NEPE推进剂拉剪强度逐渐增大;通过对材料参数值进行拟合求解,建立的改进后的圆型方程和统一强度准则能够较好描述不同加载角度和应变率下NEPE推进剂的拉剪强度,基于所建强度准则对拉剪角度15°和75°下应变率0.12 s-1和1 s-1的拉剪强度极限的预测值与试验值的误差小于实际处理的容许误差范围15%。

    Abstract:

    In order to study the effects of strain rate and tensile-shear angle on the tensile-shear strength of NEPE propellant, tensile-shear tests of the propellant for 5 tensile-shear angles (0°, 30°, 45°, 60°, 90°) and 5 strain rates (0.0012, 0.0048, 0.024, 0.12, 1 s-1) were carried out by using tensile-shear fixtures and butterfly test specimens. The variation of tensile-shear strength with tensile-shear angle and strain rate of propellant under combined tensile-shear loading was obtained. Based on the experimental results, the tensile-shear strength limit of propellant was described by the improved circular equation, and the tensile-shear strength criterion of propellant at different strain rates was established by combining the double shear unified strength theory, and the corresponding theoretical limit surface of the unified strength of propellant was drawn. Finally, the established tensile-shear strength criterion was used to predict the tensile-shear strengths of 0.12 s-1 and 1 s-1 strain rates for the tensile-shear angles of 15° and 75°. The validity of the established tensile-shear strength criterion was verified by comparing the predicted results with the experimental data. The results show that the tensile-shear strength of NEPE propellant under combined tensile-shear load increases with the increase of tensile-shear angle and strain rate. By fitting and solving the material parameter values, the improved circular equation and unified strength criterion established can well describe the tensile-shear strength of NEPE propellant for different loading angles and strain rates. Based on the established strength criterion, the errors between the predicted values and the experimental values of the tensile strength limits at the strain rates of 0.12 s-1 and 1 s-1 for the tensile-shear angles of 15° and 75° are less than the allowable error range of the actual treatment by 15%.

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刘帆,强洪夫,王稼祥,等. 基于拉剪加载试验的NEPE推进剂强度准则[J]. 含能材料,DOI:10.11943/CJEM2024193.

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  • 收稿日期: 2024-07-19
  • 最后修改日期: 2024-09-11
  • 录用日期: 2024-09-18
  • 在线发布日期: 2024-09-19
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