Unixial compression testing of M30 and JA2 gun propellants using a statistical design strategy

Gazonas, George A.; Ford, James

doi:10.1007/bf02324727

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…Due to the complex characteristics of stress–strain curves for HTPB propellant, the previous method determining the mechanical parameters of highly particle‐filled elastomers cannot be effective. In this investigation, based on the method to determine the mechanical parameters of nonmetallic materials, the yield stress

σ_{0}

, the associated strain

ε_{0}

, and elasticity modulus E were identified on the stress–strain curves in terms of a 1% offset in the total strain, as illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rate

Wang¹,

Hu²,

Wang³

et al. 2015

J of Applied Polymer Sci

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To investigate the mechanical properties and fracture mechanisms of hydroxyl-terminated polybutadiene (HTPB) propellant at low temperature and high strain rate, uniaxial tensile tests were conducted over the range of temperatures 233 to 298 K and strain rates 0.4 to 14.14 s 21 using an INSTRON testing machine, and scanning electron microscope (SEM) was employed to observe the tensile fracture surfaces. The experimental results indicate that the deformation properties of HTPB propellant are remarkably influenced by temperature and strain rate. The characteristics of stress-strain curves at low temperatures are different from that at room temperature, and the effects of temperature and strain rate on the mechanical properties are closely related to the changes of properties and the fracture mechanisms of HTPB propellant. The dominating fracture mechanism depends much on the temperature and changes from the dewetting and matrix tearing at room temperature to the particle brittle fracture at low temperature, and the effect of strain rate only alters the mechanism in a quantitative manner. Finally, a nonlinear viscoelastic constitutive model incorporating the damage evolution and the effects of temperature and strain rate was developed to describe the stress responses of this propellant under the test conditions. During this process, the Schapery-type constitutive theories were applied and one damage variable was considered to establish the damage evolution function. The overlap between experimental results and predicted results are generally good, which confirms that the developed constitutive model is valid, however, further researches should be done due to some drawbacks in describing the deformation behaviors at very large strain.

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σ_{0}

, the associated strain

ε_{0}

, and elasticity modulus E were identified on the stress–strain curves in terms of a 1% offset in the total strain, as illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rate

Wang¹,

Hu²,

Wang³

et al. 2015

J of Applied Polymer Sci

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show abstract

“…Therefore, the above experimental results can be reasonably attributed to the fact that the explosion heat of CL-20 is higher than that of RDX and HMX. Several references [39][40] have reported the explosion heat of JA2 gun propellant in the range of 4600-4900 J/g. The explosion heat of three series of NB gun propellant samples is close to that of JA2 gun propellant.…”

Section: Explosion Heat Analysismentioning

confidence: 99%

“…In addition, the maximum stress of NB propellant samples with CL-20 is larger, but the maximum strain is smaller. Gazonas [40] has report that the maximum stress of JA2 gun propellant is 22.65 MPa at room temperature and a strain rate of 10 À 2 s À 1 . The compressive strength of three series of NB gun propellant samples is better than that of JA2 gun propellant.…”

Section: Compressive Strength Analysismentioning

confidence: 99%

Performance characteristics of nitramine‐based gun propellants with TEGDN as energetic plasticizer

Lin,

Chen,

Yang

et al. 2023

Propellants Explo Pyrotec

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This study mainly explored the performance characteristics of nitramine‐based (NB) gun propellants using TEGDN as an energetic plasticizer by experimental method. Three series of NB gun propellant samples with RDX, HMX or CL‐20 were prepared referring to the formulation of JA2 gun propellant. Their thermochemical characteristics, explosion heat, chemical stability and compatibility, impact, friction and electrostatic spark sensitivities, and compressive strength were determined by various instruments. The experimental results indicated that the NB gun propellant samples with RDX have lower decomposition temperature, and those with CL‐20 have higher thermogravimetric loss. Three series of NB gun propellant samples have good chemical stability and compatibility, and their explosion heat is close to that of JA2 gun propellant, but their sensitivity is lower than that of JA2 gun propellant. The maximum stress of three series of NB gun propellant samples decreases with increasing cyclic nitramine (RDX, HMX or CL‐20) content, and their compressive strength is better than that of JA2 gun propellant.

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“…In order to evaluate the stresses in solid propellant, the piezoresistance phenomena is explored and shown [20]. The uniaxial compressive mechanical response of two energetic polymers, M30 and JA2 gun propellants, was investigated using a statistical factorial design technique, and it was discovered that aspect ratio and end-lubrication variables can affect the general mechanical behavior of these materials [21]. By using uniaxial and biaxial tensile tests, the stress-strain curves and tensile fracture surfaces of HTPB propellant were examined over a broad temperature and strain rate range, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement and simulation of the biaxial mechanical properties of solid propellant HTPB

Jin,

Yan,

Fang

et al. 2023

Propellants Explo Pyrotec

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Hydroxyl‐terminated polybutadiene (HTPB) solid propellant was widely used in carrier rocket and guided missiles, owing to its excellent mechanical properties. The material of HTPB subjected to complex load such as in the process of manufacturing, storage and transportation. Therefore, the mechanical properties of HTPB had important implications for the safety of structure and service life. The purpose of this work is to study the effects of different loading ratios and loading speeds on the biaxial tension of hydroxyl‐terminated polybutadiene (HTPB) solid propellant with a proper kind of biaxial tensile specimen and a high volume fraction three dimensional particle filling model of the material. The proper kind of biaxial tensile specimen with which the stresses in its central part could be obtained with the loads acted on each loading direction was designed and used in the study, and the strains in its central parts were obtained with digital image correlation (DIC) method. The stress‐strain relationship at each direction could be obtained by experiments. Experimental results indicated that the loading speed remarkably influenced the biaxial tensile behaviors of HTPB propellant at room temperature and at different loading ratios. The finite element simulation results demonstrated the accuracy of the biaxial experiment. Based on the experimental results, the particle debonding in biaxial experiments were analyzed and an equivalent Poisson's ratio parameter was proposed to evaluate the degree of debonding. The highly volume fraction three dimensional particle filling model provides a good simulation with experimental results and the equivalent Poisson's ratio parameter can conveniently and accurately determine the debonding of particles which is meaningful to the structure integrity assessment of HTPB solid propellant.

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Unixial compression testing of M30 and JA2 gun propellants using a statistical design strategy

Cited by 9 publications

References 8 publications

Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rate

Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rate

Performance characteristics of nitramine‐based gun propellants with TEGDN as energetic plasticizer

Experimental measurement and simulation of the biaxial mechanical properties of solid propellant HTPB

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