Hyperviscoelastic Constitutive Modelling of Solid Propellants with Damage and Compressibility

Kumar, Nomesh; Patel, B.P.; Rao, V. Venkateswara; Subhaschandran, B. S.

doi:10.1002/prep.201700238

Cited by 15 publications

(4 citation statements)

References 46 publications

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“…Based on the uniaxial experimental data of the literature [12], the hyper‐viscoelastic constitutive models considering compressibility were proposed by Kumar et al. [21, 22]. The model can successfully capture the observed behaviour of a HTPB propellant.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

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To study the tensile mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant under varying confining pressure conditions, uniaxial tensile tests were conducted under different strain rates (from 0.0006667 s−1 to 0.06667 s−1) and confining pressure conditions (from relative atmospheric pressure up 5.4±0.03 MPa) using a new‐designed confining pressure testing machine. Scanning electron microscopy (SEM) was employed to observe the tensile fracture surfaces. The mechanical properties and damage processes of the NEPE propellant under varying confining pressure conditions were studied and analysed. The results indicate that the mechanical properties of propellant materials are remarkably influenced by the varying confining pressure conditions. The ultimate strain and maximum tensile stress increase with increasing confining pressure. Moreover, the maximum tensile stress present a linear‐log relationship with the strain rate under various confining pressure conditions. Yet, the confining pressure has no obvious effect on the initial elastic modulus. The reason for the change of the mechanical properties of the NEPE propellant is that confining pressure delays the initiation and development of damage under the tensile loading. Based on the time‐pressure superposition principle (TPSP), the master curve of maximum tensile strength of the NEPE propellant was constructed. Furthermore, the results can provide a theoretical foundation for the analysis of the structural integrity of propellant grains of a SRM under ignition conditions. Finally, a constitutive model considering compressibility of propellant materials can be constructed.

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Section: Introductionmentioning

confidence: 99%

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

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“…RDX, also known as hexogen, is one of the best‐researched and most‐used secondary explosives [1] . It has several applications in the civilian as well as military sector, for example in combination with a binder used as plastic‐bonded explosives (PBX) [1–3] . With a moderate sensitivity towards external stimuli and high detonation performance RDX (1,3,5‐trinitro‐1,3,5‐triazinane) is a popular energetic material.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Characterization of Nitrazapropane‐, Oxapropane‐ and Trinitrazaheptane‐Bridged Nitro Esters

Lechner,

Riedelsheimer,

Gerold

et al. 2023

Eur J Org Chem

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In this work, 1,3‐dinitroxy‐2‐nitrazapropane and 1,7‐dinitroxy‐2,4,6‐trinitrazaheptane were synthesized and investigated. Starting from hexamine, the open‐chain compounds were prepared by a modified Bachmann procedure which is commonly used for the synthesis of hexogen (RDX) and octogen (HMX). All new compounds were characterized by NMR spectroscopy, X‐ray diffraction, vibrational analysis and elemental analysis. Their thermal behavior was studied by differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The sensitivities towards impact (IS) and friction (FS) were determined according to the BAM (Bundesanstalt für Materialforschung und ‐prüfung) standard method. Their energetic properties, which were determined from the energies of formation at the CBS‐4 M level, were calculated using the EXPLO5 computer code. Moreover, 1,3‐dinitroxy‐2‐oxapropane was synthesized and investigated. The various compounds were compared with each other and with the commonly used explosives in terms of their physicochemical properties and detonation behavior.

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“…According to the finite strain constitutive model framework and Park's experimental results, Kumar et al. [33, 34] proposed two constitutive models to predict the tensile behavior of HTPB propellants under different hydrostatic pressure conditions. The effect of pressure was modeled by the dilatational strain energy function.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

Chen

Hou

et al. 2021

Propellants Explo Pyrotec

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In order to study the effects of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant, compressive tests were conducted under various confining pressure conditions and strain rates using a new‐designed active gas confining pressure testing machine. The stress‐strain curves and mechanical properties of the NEPE propellant under varying confining pressure conditions and strain rates were obtained. The results show that the compressive mechanical properties of the NEPE propellant are remarkably influenced by the confining pressure and strain rate. The compressive strength under confining pressure is obviously larger than those without applied confining pressure. With the coupled effects of the confining pressure and strain rate, the compressive strength under 5.4 MPa and 6.67×10−2 s−1 is 2.17 times of its value at room condition and 6.67×10−4 s−1. Then, based on previous tensile results, the quantified comparisons of tensile and compressive mechanical properties under different experimental conditions were presented. Finally, a nonlinear constitutive model with damage was constructed to model the effect of pressure. The statistical damage model parameters were defined as ExpDec1 function of pressure P. The calibrated model can accurately predict the mechanical behaviour of the NEPE propellant under different confining pressure conditions and strain rates.

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Hyperviscoelastic Constitutive Modelling of Solid Propellants with Damage and Compressibility

Cited by 15 publications

References 46 publications

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Investigation and Characterization of Nitrazapropane‐, Oxapropane‐ and Trinitrazaheptane‐Bridged Nitro Esters

Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

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