新型GAP/RDX/TEGDN推进剂宽应变率下的力学性能及模型参数标定

doi:10.12382/bgxb.2023.1001

摘要/Abstract

摘要：

高能低易损固体推进剂力学模型参数的准确性对其宏观力学响应预测具有重要的意义,为解耦标定固体推进剂黏弹塑性损伤模型参数,提出一种基于试验的模型参数标定方法。采用万能试验机和分离式霍普金森压杆装置开展准静态和动态试验,标定GAP/RDX/TEGDN(GRT)固体推进剂黏弹塑性损伤参数,分析其宽应变率下的力学性能和损伤机理。试验结果表明:GRT推进剂的力学行为表现出明显的应变率依赖性,随拉伸速率(1~1000mm/min)的增加,抗拉强度和延伸率分别提高75%和43.33%;随准静态压缩应变率(0.001~1s^-1)的增加,屈服强度提高16.67%;随动态压缩应变率(2100~4100s^-1)的增加,屈服强度提高72.98%;材料的断裂应变与应力状态相关,断裂应变随应力三轴度(η取值为0.33~0.74)增大而减小了36.36%。根据GRT推进剂细观表征得出准静态拉伸下以界面脱粘为主的破坏机制,准静态压缩和动态压缩下以颗粒破碎为主的破坏机制。在此基础上,通过准静态和动态压缩试验标定Plastic-Kinematic本构模型参数,应力松弛试验标定Prony级数参数,缺口试验和准静态拉伸试验标定断裂损伤模型参数,所提方法能够更精准地标定模型参数,为推进剂宏观力学性能预测分析提供支撑。

关键词: GAP/RDX/TEGDN推进剂, 力学性能, 界面脱粘, 颗粒破碎, 标定参数

Abstract:

The accuracy of mechanical model parameters of high-energy and low-vulnerability solid propellant is of great significance to the prediction of its macroscopic mechanical response. In order to decouple the parameters of the viscoelastoplastic damage model of solid propellant, a model parameter calibration method based on experiment is proposed. The viscoelastoplastic damage parameters of GAP/RDX/TEGDN (GRT) solid propellant are calibrated by the quasi-static and dynamic tests using a universal testing machine and a split Hopkinson pressure bar device. The mechanical properties and damage mechanism of GRT at a wide range of strain rate are analyzed. The experimental results show that the mechanical behavior of GRT propellants is obviously strain rate-dependent, and the tensile strength and elongation are increased by 75% and 43.33%, respectively, with the increase in the tensile rate (1-1000mm/min). With the increase in quasi-static compressive strain rate (0.001-1s^-1), the yield strength is increased by 16.67%. With the increase in dynamic compressive strain rate (2100-4100s^-1), the yield strength is increased by 72.98%. The fracture strain of the material is related to the stress state. The fracture strain is decreased by 36.36% with the increase in stress triaxial degree (η=0.33 to η=0.74). In addition, according to the microscopic characterization of GRT propellants, the main failure mechanism is interface debonding under quasi-static stretching, and the main failure mechanism is particle breakage under quasi-static and dynamic compressions. On this basis, the parameters of Plastic-Kinematic constitutive model are calibrated by quasi-static and dynamic compression tests, the parameters of Prony series are calibrated by stress relaxation test, and the parameters of fracture damage model are calibrated by notch test and quasi-static tensile test. Therefore, the model parameters could be calibrated more accurately by the proposed method. It provides support for the prediction and analysis of macroscopic mechanical properties of propellants.

Key words: GAP/RDX/TEGDN propellant, mechanical property, interface debonding, particle breakage, calibration parameter

中图分类号:

TJ55

董理赢, 谭向龙, 吴艳青, 杨昆. 新型GAP/RDX/TEGDN推进剂宽应变率下的力学性能及模型参数标定[J]. 兵工学报, 2024, 45(12): 4517-4529.

DONG Liying, TAN Xianglong, WU Yanqing, YANG Kun. Mechanical Properties and Model Parameter Calibration of a Novel GAP/RDX/TEGDN Propellant at Wide Range of Strain Rate[J]. Acta Armamentarii, 2024, 45(12): 4517-4529.

图/表 22

表1 GRT推进剂配方

Table 1 GRT propellant formulation

组分	AP	RDX	Al	GAP	TEGDN	其他
百分比/%	45	10	19.5	12	12	1.5

图1 GRT推进剂试件尺寸示意图

Fig.1 Schematic diagram of GRT propellant specimen size

图2 GRT推进剂细观形貌

Fig.2 Micro-morphology structure of GRT propellant

图3 万能试验机装置

Fig.3 Schematic diagram of universal testing machine

图4 SHPB动态压缩试验装置示意图

Fig.4 Schematic diagram of SHPB dynamic compression test device

图5 GRT推进剂拉伸真实应变-应力

Fig.5 Tensile true strain-stress curve of the GRT propellant

图6 GRT推进剂的应力松弛曲线

Fig.6 Stress relaxation curve of GRT propellant

图7 不同应力三轴度拉伸试件的真实应力-应变

Fig.7 True stress-strain curves of triaxial tensile specimens with different stresses

图8 GRT推进剂准静态压缩真实应变-应力

Fig.8 True strain-stress curve of GRT propellant under quasi-static compression

图9 GRT推进剂动态压缩真实应变-应力

Fig.9 True strain-stress curve of GRT propellant under dynamic compression

图10 GRT推进剂试验后SEM图像

Fig.10 SEM images of the post-test GRT propellant

图11 准静态1.0s-1应变率压缩曲线

Fig.11 Quasi-static 1.0s-1 strain rate compression curve

图12 试件的硬化模量参数h的拟合结果

Fig.12 Fitting results of the hardening modulus parameter h of specimen

表2 GRT推进剂参数拟合结果

Table 2 Parameter fitting results of GRT propellant

σ₀/MPa	h/MPa
0.2104	2.8728

图13 试件的应变率参数C和P的拟合结果

Fig.13 Fitting results of strain rate parameters C and P of specimen

表3 GRT推进剂的Cowper-Symonds模型参数

Table 3 Cowper-Symonds model parameters of GRT propellant

C/s^-1	P
146.4857	1.2089

图14 试件的应力松弛曲线的拟合结果

Fig.14 Fitting results of the stress relaxation curve of specimen

表4 GRT推进剂的松弛模量和松弛时间

Table 4 Relaxation modulus and relaxation time of GRT propellant

E₁/MPa	E₂/MPa	E₃/MPa	E₄/MPa	E_∞/MPa
0.2565	0.1135	0.1068	0.0816	0.7475
τ₁/s	τ₂/s	τ₃/s	τ₄/s	τ_∞/s
1.4320	16.6848	183.0524	1354.4140	∞

图15 应力三轴度与等效塑性断裂应变关系

Fig.15 Relation between stress triaxiality and equivalent plastic fracture strain

图16 εf/D0-1与ln ε · *关系

Fig.16 Relationship between εf/D0-1 and ln ε · *

表5 GRT推进剂的断裂损伤参数

Table 5 Fracture damage parameters of GRT propellant

D₁	D₂	D₃	D₄	D₅
0.2072	2.6936	-9.1985	0.1064	0

图17 本构模型理论计算与试验结果对比

Fig.17 Comparison between theoretical curve and experimental curve of the constitutive model

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