双基推进剂的切口强度及切口敏感性

胡少青; 鞠玉涛; 韦震; 周长省

doi:10.13224/j.cnki.jasp.2014.08.032

双基推进剂的切口强度及切口敏感性

doi: 10.13224/j.cnki.jasp.2014.08.032

南京理工大学机械工程学院, 南京 210094

基金项目:

重点预研项目（20101019）

详细信息

作者简介:
胡少青（1987-），男，江苏新沂人，博士生，主要研究方向为固体火箭发动机装药结构完整性分析。通讯作者:

通讯作者:
鞠玉涛（1967-），男，山西太原人，教授，博士，主要研究方向为固体火箭发动机装药完整性分析、固体火箭发动机理论与设计。

中图分类号: V512⁺.2
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出版历程
- 收稿日期: 2013-04-17
- 刊出日期: 2014-08-28

Notch strength and notch sensitivity of double base propellant

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

摘要

摘要: 为了获取双基推进剂的切口强度及切口敏感性，在环境温度为（20±1）℃，应变率为10^-4s^-1条件下，进行了双基推进剂板条状双边U型切口试件及标准试件的单轴拉伸试验.结果表明：在一定的范围内，双基推进剂的切口强度随着切口试件的应力集中系数的变化而变化.当应力集中系数小于切口敏感因子（1.99~2.22）时，板条状双边U形切口试件的切口强度受应力集中系数影响不大，近似等于材料的抗拉强度，材料对切口不敏感.用标准试件单轴拉伸的试验结果对双基推进剂的切口强度及切口敏感因子进行预测，预测结果与试验结果较吻合，验证了这种预测方法的有效性.
- 双基推进剂 /
- 切口强度 /
- 切口敏感性 /
- 应力集中系数 /
- 断裂
Abstract: To obtain the notch strength and notch sensitivity of double base propellant, uniaxial tensile tests on the double-edge U-notched thin plate specimens and standard specimens were carried out under the strain rate of 10^-4s^-1 at (20±1)℃.Results show that the stress concentration factor of notched specimens has a significant effect on the notch strength within certain limits. When the stresscon centration factor is less than the notch sensitivity factor (1.99~2.22), the notch strength of double-edge U-notched thin plate specimans is approximately equal to its fracture strength and independent of the stress concentration factor. This indicates that the double base propellant is insensitive to notch in this case. The uniaxial tensile test results of standard specimens is used to predict the value of the notch strength and notch sensitivity factor of double base propellant, and the predictions are consistent with the test results of the notched specimens proving the validity of this prediction method.
- double base propellant /
- notch strength /
- notch sensitivity /
- stress concentration factor /
- fracture

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参考文献(15)

[1]	Dupont J H,Loehr R D,Renz R N.Solid propellant rocket motor with notched annular fuel:US,8181444[P].2012-05-22.
[2]	ZHENG Xiulin.Notch strength and notch sensitivity of materials:fracture criterion of notched elements[M].Beijin:Science Press,2008.
[3]	Wang F,Zheng X L,Lu M X.Notch strength of ceramics and statistical analysis[J].Engineering Fracture Mechanics,1995,52(5):917-921.
[4]	王泓,鄢君辉,郑修麟.航空有机玻璃切口强度及切口敏感性估算[J].机械强度,2001,23(2):131-133. WANG Hong,YAN Junhui,ZHENG Xiulin.Predicting of notch strength and notch sensitivity in aviation polymethyl methacrylate[J].Journal of Mechanical Strength,2001,23(2):131-133.(in Chinese)
[5]	Rao A S,Krishna Y,Rao B N.Comparison of fracture models to assess the notched strength of composite/solid propellant tensile specimens[J].Materials Science and Engineering:A,2004,385(1):429-439.
[6]	Herder G,Weterings F P,de Klerk W P C.Mechanical analysis on rocket propellants[J].Journal of Thermal Analysis and Calorimetry,2003,72(3):921-929.
[7]	Díríkolu M H,Kalaycio AğG lu B.Characterisation of mechanical and thermal properties of double base propellant[J].Materials Research Innovations,2010,14(4):297-300.
[8]	Kalaycioglu B,Dirikolu M H,elik V.An elasto-viscoplastic analysis of direct extrusion of a double base solid propellant[J].Advances in Engineering Software,2010,41(9):1110-1114.
[9]	Su Ac＇ eska M,Bakija S,Kodvan J J,et al.Study of mechanical properties of naturally aged double base rocket propellants[J].Central European Journal of Energetic Materials,2010,7(1):47-60.
[10]	ZHANG Jianbin,JU Yutao,ZHOU Changsheng.Experimental research on cohesion and internal friction angle of the double-base propellant[J].Propellants,Explosives,Pyrotechnics,2013,38(3):351-357.
[11]	张忠平,张东伟,傅振堂,等.拉伸载荷下U形缺口薄板试件应力集中系数修正公式[J].空军工程大学学报:自然科学版,2010,11(1):74-77. ZHANG Zhongping,ZHANG Dongwei,FU Zhentang,et al.Stress concentration factor of U-shaped notch sheet under tensile load[J].Journal of Air Force Engineering University:Natural Science Edition,2010,11(1):74-77.(in Chinese)
[12]	胡少青,鞠玉涛,孟红磊,等.双基推进剂压缩力学性能的应变率相关性研究[J].弹道学报,2011,23(4):75-79. HU Shaoqing,JU Yutao,MENG Honglei,et al.Effects of strain rate on mechanical properties of DBP under uniaxial compression condition[J].Journal of Ballistics,2011,23(4):75-79.(in Chinese)
[13]	张建彬,鞠玉涛,周长省.双基固体推进剂率相关性研究[J].弹道学报,2011,23(4):80-83. ZHANG Jianbin,JU Yutao,ZHOU Changsheng.Study on rate correlativity of double-base solid propellant[J].Journal of Ballistics,2011,23(4):80-83.(in Chinese)
[14]	ZHENG Xiulin.On an unified model for predicting notch strength and fracture toughness of metals[J].Engineering Fracture Mechanics,1989,33(5):685-695.
[15]	申志彬,唐国金,雷勇军,等.基于Patran二次开发的星形药柱结构分析与设计[J].固体火箭技术,2009,32(2):175-179. SHEN Zhibin,TANG Guojin,LEI Yongjun,et al.Analysis and design for star-shaped grain based on secondary development of Patran[J].Journal of Solid Rocket Technology,2009,32(2):175-179.(in Chinese)