高应变率下HTPB推进剂动态断裂性能研究

推进技术 ›› 2015, Vol. 36 ›› Issue (3): 471-475.

高应变率下HTPB推进剂动态断裂性能研究

龙兵¹,常新龙¹,张有宏¹,马仁利¹,孙翔宇²

第二炮兵工程大学，陕西西安 710025,第二炮兵工程大学，陕西西安 710025,第二炮兵工程大学，陕西西安 710025,第二炮兵工程大学，陕西西安 710025,西北工业大学航空学院，陕西西安 710072

发布日期:2021-08-15
作者简介:龙兵(1986—)，男，博士生，研究领域为失效物理与可靠性。

Study on Dynamic Fracture Properties of HTPB Propellant Under High Strain Rate

The Second Artillery Engineering University，Xi’an 710025，China,The Second Artillery Engineering University，Xi’an 710025，China,The Second Artillery Engineering University，Xi’an 710025，China,The Second Artillery Engineering University，Xi’an 710025，China and Aeronautics College，Northwestern Polytechnical University，Xi’an 710072，China

Published:2021-08-15

摘要/Abstract

摘要： 为研究HTPB推进剂在冲击载荷作用下的动态断裂特性与破坏机理，使用中心直裂纹圆盘试件，在分离式Hopkinson压杆实验系统上开展了推进剂动态断裂实验，得到了高应变率下HTPB推进剂的Ⅰ型动态起裂韧性值，利用扫描电镜观察了推进剂的断面形貌，并使用分形几何方法计算了断面分形盒维数。结果表明:本文的实验方法是有效的，推进剂的动态起裂韧性具有明显的应变率敏感性，在应变率400～1100s-1范围内，其值随着加载速率的增加呈现线性增长的关系；推进剂在高应变率条件下呈现颗粒破碎、穿晶断裂等脆性断裂特性，应变率越高，推进剂断面的分形盒维数越大，推进剂的颗粒破碎程度越严重，从微观层面验证了推进剂断裂韧性的应变率敏感性。

关键词: 推进剂；圆盘；动态断裂；应变；动态实验

Abstract: In order to study dynamic fracture properties and failure mechanism of HTPB propellant under impact loading conditions，a dynamic fracture experiment was carried out by using the cracked straight-through Brazilian disc （CSTBD） specimen on the split Hopkinson pressure bar（SHPB），and the mode Ⅰ dynamic initiation fracture toughness of HTPB propellant under high strain rate were obtained. The fracture surface microscopic pattern was observed by SEM，and by means of fractal geometry method，the fractal box dimension of the fracture surface was calculated. Experimental results indicate that proposed dynamic fracture testing for HTPB propellant is effective. The dynamic initiation fracture toughness is obviously sensitive to strain rate，and its value increases linearly with the loading rate increasing in the strain rate range of 400～1100s-1. The propellant presents brittle fracture property of a particle breakage and transgranular fracture mode under high strain rate，and the higher the strain rate，the greater the fractal box dimension is greater，and the degree of particle breakage is more serious. The stain rate sensitivity of the dynamic fracture toughness of solid propellant is validated in microscopic view.

Key words: Propellant；Brazilian disc；Dynamic fracture；Strain；Dynamic test

龙兵,常新龙,张有宏,马仁利,孙翔宇. 高应变率下HTPB推进剂动态断裂性能研究[J]. 推进技术, 2015, 36(3): 471-475.

LONG Bing¹,CHANG Xin-long¹,ZHANG You-hong¹,MA Ren-li¹,SUN Xiang-yu². Study on Dynamic Fracture Properties of HTPB Propellant Under High Strain Rate[J]. Journal of Propulsion Technology, 2015, 36(3): 471-475.

参考文献

[1] Warren R C. Impact Fracture Behavior of Double-base Gun Propellants[J]. Journal of Materials Science, 1985,20: 3131-3140.
[2] Fong C W, Warren R C. The Effect of Filler Particle Size and Orientation on the Impact Fracture Toughness of a Highly Filled Plasticized Polymeric Material[J].Journal of Materials Science, 1985, 20: 3101-3110.
[3] Abdelaziz M N, Neviere R, Pluvinage G. Experitmental Method for JIC Computation on Fracture of Solid Propellants Under Dynamic Loading Conditions[J]. Engineering Fracture Mechanics, 1987, 28(4): 425-434.
[4] Abdelaziz M N, Neviere R, Pluvinage G. Experimental Investigation of Fracture Surface Energy of a Solid Propellant Under Different Loading Rates[J]. Engineering Fracture Mechanics, 1988, 31(6): 1009-1026.
[5] 黄风雷, 王泽平, 丁敬. 复合固体推进剂动态断裂研究[J]. 兵工学报, 1995, 2: 47-50.
[6] 张建伟, 职世君, 孙冰. 含裂纹药柱老化结构分析[J]. 航空动力学报, 2013, 28(4): 935-940.
[7] 蒙上阳, 胡光宇, 刘兵, 等. 固体火箭发动机药柱裂纹的J积分分析[J]. 固体火箭技术, 2010, 33(6):646-649.
[8] 李东. 固体推进剂药柱表面裂纹动态力学特性研究[D]. 南京: 南京理工大学, 2009.
[9] 常新龙, 赖建伟, 张晓军, 等. HTPB推进剂高应变率粘弹性本构模型研究[J]. 推进技术, 2014, 35(1): 123-127. (CHANG Xin-long, LAI Jian-wei, ZHANG Xiao-jun, et al. High Strain-Rate Viscoelastic Constitutive Model for HTPB Propellant[J]. Journal of Propulsion Technology, 2014, 35(1): 123-127.)
[10] 王蓬勃, 王政时, 鞠玉涛, 等. 双基推进剂高应变率型本构模型的实验研究[J]. 固体火箭技术, 2012, 35(1): 69-72.
[11] 陈荣. 一种PBX炸药试样在复杂应力动态加载下的力学性能实验研究[D]. 长沙:国防科学技术大学, 2010.
[12] Mulli W J, Curran D R, Seaman L. Fracture Model for High Energy Propellant[J]. Shock Waves in Condensed Matters, 1981, 78: 460-464.
[13] Hartley R S, Cloete T J, Nurick G N. An Experimental Assessment of Friction Effects in the Split Hopkinson Pressure Bar Using the Ring Compression Test[J]. International Journal of Impact Engineering,2007,34(10): 1705-1728.
[14] Owen D M, Zhuang S, Rosakis A J, et al. Experimental Determination of Dynamic Crack Initiation and Propagation Fracture Toughness in Thin Aluminum Sheets[J].International Journal of Fracture, 1998, 90(1-2): 153-174.
[15] 董世明, 汪洋, 夏源明. 中心裂纹圆盘集中载荷作用下的应力强度因子[J]. 中国科学技术大学学报,2003, 33(3): 310-317.
[16] Souza F V, Kim Y R, Gazonas G A, et al. Computational Model for Predicting Nonlinear Viscoelastic Damage Evolution in Materials Subjected to Dynamic Loading[J]. Composites Part B, 2009, 40(6): 483-494.(编辑:史亚红)　　　　　　　　　　　　　　收稿日期:2014-05-25；修订日期:2014-07-02。作者简介:龙兵(1986—),男,博士生,研究领域为失效物理与可靠性。 E-mail: longbingfh@126.com