Analysis Method for Elastic Modulus of Typical Gun-propellant under Impact Loading

doi:10.3969/j.issn.1000-1093.2021.02.007

Abstract

Abstract: The experimental research on drop hammer impacting of gun-propellant was made to obtain an effective analysis method for the elastic modulus of typical gun-propellant under impact loading. The stress and strain curves of gun-propellant during drop hammer impact test were obtained through high-speed photography and digital image correlation method. On this basis, the linear-elastic, nonlinear-elastic and viscoelastic analysis methods are used to get the change laws of elastic modulus of DAGR125-21/19 with impact energy and velocity at normal and low temperatures. The results show that the elastic modulus of gun-propellant changes slightly at normal and low temperatures with the increase in the impact velocity. Furthermore, the magnitude of elastic modulus from viscoelastic analysis is least, the results from linear elastic analysis are close to those from nonlinear elastic analysis, and the elastic modulus of gun-propellant at low temperature is much greater than that at normal temperature. The elastic modulus of SF-3 double-base gun-propellant was studied. It is found that the elastic modulus of SF-3 double-base gun-propellant is equivalent to that of DAGR125-21/19 at normal temperature, but the elastic modulus of the former is much bigger than that of the latter at low temperature. The reliable and accurate elastic modulus of gun-propellant can be derived by using viscoelastic analysis based on digital image correlation method.

Key words: gun-propellant, dropweightimpacttesting, elasticmodulus, digitalimagecorrelation

CLC Number:

O343.5
TJ55

LIU Jihua， ZHAO Hongli， HE Changhui， JIN Jianwei， ZHANG Zouzou, WANG Qionglin, ZHAO Baoming. Analysis Method for Elastic Modulus of Typical Gun-propellant under Impact Loading[J]. Acta Armamentarii, 2021, 42(2): 289-296.

References

［1］ LIEB R J. Correlation of the failure modulus to fracture-generate surface area in uniaxially compressed M43 gun propellant [R]. Aberdeen Proving Ground, MD,US: Army Research Laboratory, 1995.
[2] 芮筱亭, 冯宾宾, 王国平. 发射装药发射安全性评估方法[J]. 兵工自动化, 2011, 30(5): 56-60.
RUI X T, FENG B B, WANG G P. Evaluation method of launch safety of propellant charge [J]. Ordnance Industry Automation, 2011, 30(5): 56-60.(in Chinese)
[3] 王永强, 杨慧群, 韩进朝. 改善发射药力学性能方法研究进展[J]. 化工新型材料, 2019, 47(7): 50-59.
WANG Y Q, YANG H Q, HAN J C. Study progress in method for improving the mechanical property of gun propellant [J]. New Chemical Materials, 2019, 47(7): 50-59.(in Chinese)
[4] 杨均匀, 袁亚雄, 张小兵. 发射药破碎对火炮射击安全性影响的研究综述[J]. 弹道学报, 1999, 11(4): 92-96.
YANG J Y, YUAN Y X, ZHANG X B. Research survey of the effect of grain fracture on the fire safety in solid propellant gun [J]. Journal of Ballistics, 1999, 11(4): 92-96.(in Chinese)
[5] 徐劲祥. 发射装药挤压破碎对燃烧规律的影响[J]. 火炸药学报, 2007, 30(3):69-71.
XU J X. Effect of extrusion and fracture of gun propellant charge on combustion behavior[J]. Chinese Journal of Explosives and Propellants, 2007, 30(3):69-71.(in Chinese)
[6] 陈涛, 芮筱亭, 贠来峰, 等. 发射药床动态挤压破碎模拟研究[J]. 南京理工大学学报, 2006, 30(4):467-471.
CHEN T, RUI X T, YUN L F, et al. Dynamic extrusion and fracture simulation of propellant charge bed [J]. Journal of Nanjing University of Science and Technology, 2006, 30(4):467-471.(in Chinese)
[7] 姜世平, 黎超. 火炮发射药床冲击破碎动力学仿真研究[J]. 弹道学报, 2019, 31(3):41-45.
JIANG S P, LI C. Dynamic simulation of fragmentation of gun propellant bed under impact load [J]. Journal of Ballistics, 2019, 31(3):41-45.(in Chinese)
[8] 姜世平, 芮筱亭, 洪俊, 等. 发射药床冲击破碎过程的数值模拟 [J]. 固体力学学报, 2011, 32(4):419-425.
JIANG S P, RUI X T, HONG J, et al. Simulation of fragmentation process of propellant ben under impact load [J]. Chinese Journal of Solid Mechanics, 2011, 32(4):419-425.(in Chinese)
[9] 洪俊, 芮筱亭. 发射药粒冲击破碎动力学仿真[J]. 弹道学报, 2010, 22(1):61-64.
HONG J, RUI X T. Dynamic simulation for impact and fracture of propellant grain [J]. Journal of Ballistics, 2010, 22(1):61-64.(in Chinese)
[10] 韩屹湛. 多孔发射药力学特性实验研究与数值仿真[D]. 南京：南京理工大学，2016.
HAN Y Z.Experimental study and numerical simulation on the mechanics characteristic of multi-perforated propellant [D]. Nanjing:Nanjing University of Science and Technology， 2016.(in Chinese)
[11] PAN B, QIAN K M, XIE H M, et al. Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review [J]. Measurement Science and Technology, 2009, 20（6）:062001.
[12] HILD F, ROUX S. Digital image correlation: from displacement measurement to identification of elastic properties - a review [J]. Strain, 2006, 42(2):69-80.
[13] 段淇元, 宫文然, 郭保桥, 等. 高温数字图像相关方法中的制斑和图像处理技术[J]. 清华大学学报（自然科学版）, 2019, 59(6): 425-431.
DUAN Q Y, GONG W R, GUO B Q, et al. Techniques of speckle fabrication and image processing for high temperature digital image correlation [J]. Journal of Tsinghua University (Science and Technology), 2019, 59(6): 425-431.(in Chinese)
[14] 易亚楠, 张小娟, 马少鹏, 等. 基于数字图像相关方法的核石墨力学参数测量[J]. 核动力工程, 2019, 40(3):61-65.
YI Y N, ZHANG X J, MA S P, et al. Parameters measurement of nuclear graphite based on digital image correlation [J]. Nuclear Power Engineering, 2019, 40(3): 61-65.(in Chinese)
[15] 王礼立, PLUVINAGE G, LABIBES K. 冲击载荷下高聚物动态本构关系对粘弹性波传播特性的影响[J]. 宁波大学学报, 1995, 18(3):30-57.
WANG L L, PLUVINAGE G, LABIBES K. The influence of dynamic constitutive relations of polymers at impact loading on the viscoelastic wave propagation character [J]. Journal of Ningbo University, 1995, 18(3):30-57.(in Chinese)
[16] 施绍裘, 喻炳, 王礼立. PP/PA共混高聚物在高应变率下的热粘弹性本构关系和时温等效性[J]. 爆炸与冲击, 2007, 27(3):210-216.
SHI S Q, YU B, WANG L L. Thermoviscoelastic constitutive equation of PP/PA blends and its rate-temperature equivalence relation at high strain rates [J]. Explosion and Shock Waves, 2007, 27(3):210-216.(in Chinese)

第42卷第2期2021 年2月
兵工学报ACTA ARMAMENTARII
Vol.42No.2Feb. 2021

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