Mechanical Properties and Model Parameter Calibration of a Novel GAP/RDX/TEGDN Propellant at Wide Range of Strain Rate

doi:10.12382/bgxb.2023.1001

Abstract

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

CLC Number:

TJ55

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.

Figures/Tables 22

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

Fig.1 Schematic diagram of GRT propellant specimen size

Fig.2 Micro-morphology structure of GRT propellant

Fig.3 Schematic diagram of universal testing machine

Fig.4 Schematic diagram of SHPB dynamic compression test device

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

Fig.6 Stress relaxation curve of GRT propellant

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

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

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

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

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

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

Table 2 Parameter fitting results of GRT propellant

σ₀/MPa	h/MPa
0.2104	2.8728

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

Table 3 Cowper-Symonds model parameters of GRT propellant

C/s^-1	P
146.4857	1.2089

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

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	∞

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

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

Table 5 Fracture damage parameters of GRT propellant

D₁	D₂	D₃	D₄	D₅
0.2072	2.6936	-9.1985	0.1064	0

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

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