Study on the Viscoelastic Poisson‘s Ratio of Solid Propellants Using Digital Image Correlation Method

Cui, Hui Ru; Tang, Guifen; Shen, Zhi-Bin

doi:10.1002/prep.201500313

Cited by 31 publications

(13 citation statements)

References 19 publications

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“…The mechanical property parameters of each component material of the motor are shell elastic modulus 2:05 × 10 5 MPa and Poisson's ratio 0.28, and Poisson of propellant is 0.496. The relaxation modulus of low-temperature insulation, cladding, and propellant are measured, and Prony series is proposed (take N items) [20,21]: where E ∞ is the permanent relaxation modulus (t ⟶ ∞), E n is the elastic modulus (the n th Maxwell unit), and τ n is the relaxation time.…”

Section: Construction Of Solid Rocket Motormentioning

confidence: 99%

Crack Group Effect Analysis of the Stress-Release Boot of Solid Rocket Motor Based on Numerical Simulation

Han

et al. 2021

International Journal of Aerospace Engineering

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Due to the complex process of the insulation layer patch in solid rocket motor (SRM), only manual patch could be used. Sometimes weak bonding or debonding in each joint surface was inevitable. This study is aimed at determining the crack group effect of insulation and interfacial debonded crack in the wide-temperature SRM. The crack group appeared in the front area of the ahead stress-release boot and was induced by low temperature, axial overload, or interface bonding failure. Based on the viscoelastic finite element method, singular crack elements and singular interfacial crack elements at the tips of crack group were established to calculate J -integral. Varying according to the length and position of cracks, the J -integral of crack tips was, respectively, calculated to prejudge their stability and the crack group effect. The results showed that collinear crack group appeared in the front stress-release boot layer, and the crack group had a certain shielding effect on the main crack when the SRM was launched at low temperature. When noncollinear crack group appeared in the front stress-release boot layer, the crack group effect changed with the length of the main crack. The crack group first had a shielding effect on the main crack and then had a strong strengthening effect. The experimental test of the simulated specimen revealed that numerical simulation results matched the experimental test results.

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Section: Construction Of Solid Rocket Motormentioning

confidence: 99%

Crack Group Effect Analysis of the Stress-Release Boot of Solid Rocket Motor Based on Numerical Simulation

Han

et al. 2021

International Journal of Aerospace Engineering

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“…Physically, the complex Poisson's ratio is defined as the ratio of lateral strain to axial strain. Assuming application of a dynamic strain in the longitudinal direction, the lateral strain is delayed in relation to the axial strain due to the energy dissipation capacity of the material (Theocaris, 1968;Kugler et al, 1990;Pritz, 1998;Cui et al, 2016). As a result, if the dynamic axial strain is a harmonic function, represented in the complex form according to…”

Section: Complex Poisson's Ratiomentioning

confidence: 99%

“…The identification of the complex Poisson's ratio in the frequency domain can be performed through direct or indirect methods (Pritz, 1998;Tschoegl et al, 2002). In direct methods, the ratio can be obtained from measurements performed directly on the structure (Kabeer et al 2013;Cui et al 2016). On the other hand, in indirect methods, the identification occurs by constructing and evaluating auxiliary complex viscoelastic functions (Young's, shear and/or bulk modulus).…”

Section: Introductionmentioning

confidence: 99%

Indirect Identification of the Complex Poisson's Ratio in Fractional Viscoelasticity

Sousa

Silva

Pereira

2018

Lat. Am. j. solids struct.

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The use of viscoelastic materials (VEMs) has becoming more and more frequent both as vibration control in general or as parts of structural components. In all applications, the mechanical behavior of such materials can be predicted by the complex moduli (Young's, shear or volumetric) and the complex Poisson's ratio. Over recent decades, various methodologies have been presented aiming at characterizing complex moduli. On the other hand, the indirect identification of the Poisson's ratio, in the frequency domain, proves to be underexplored. The present paper discusses two computational methodologies in order to obtain, indirectly, the complex Poisson's ratio in linear and thermorheologically simple solid VEMs. The first of them uses a traditional methodology, which individually identifies the complex Young's and the shear moduli and, from them, one obtains the complex Poisson's ratio. The second methodologyproposed in the present paper and called 'integrated'-obtains the complex Poisson's ratio through a simultaneous identification of those two complex moduli. Both methodologies start from a set of experimental points of the complex moduli in the frequency domain, carried out at different temperatures. From those points, a hybrid optimization technique is applied (Genetic Algorithms and Non-Linear Programming) in order to obtain the parameters of the constitutive models for the VEM under analysis. For the experiments described here, the integrated methodology proves to be very promising and with a great application potential.

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“…Given that the grain structure is rationally designed, when the comprehensive mechanical properties of propellants are good or the working temperature is not very low, the structural integrity of grain usually can be ensured under the working pressure [3]. Also, the influence from the case stiffness is not obvious, and the case design can meet the requirement of the internal pressure strength will be enough [4][5][6]. As for tactic motors in service at low temperatures, explosions occur from time to time in the ground test when the motor is working [7,8].…”

Section: Introductionmentioning

confidence: 99%

The Influence Factors of Grain Integrity under the Internal Pressure Condition in SRM

Wang

Tian

2021

International Journal of Aerospace Engineering

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To investigate the influence factors of propellant grain integrity under the internal pressure, the cylindrical grain was equivalent to a thick-wall cylinder and its three-dimension stress-strain problem was solved. Under the internal and external pressure, the strain and displacement equations of the inside thick-wall cylinder were expressed, and then, the stress and strain expressions of grain were obtained. On this basis, the hoop strain equations on the inside surface of the cylindrical grain and case were developed. The hoop strain on the inner surface of the grain can be predicted by the hoop strain of the case cylinder via the strain equations, and therefore, the hoop strain in the inner surface can be indirectly monitored in real time during the working process of the motor. The hoop strain in the inner surface of grain can be effectively reduced by increasing the case stiffness or decreasing the m number of the grain.

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Study on the Viscoelastic Poisson‘s Ratio of Solid Propellants Using Digital Image Correlation Method

Cited by 31 publications

References 19 publications

Crack Group Effect Analysis of the Stress-Release Boot of Solid Rocket Motor Based on Numerical Simulation

Crack Group Effect Analysis of the Stress-Release Boot of Solid Rocket Motor Based on Numerical Simulation

Indirect Identification of the Complex Poisson's Ratio in Fractional Viscoelasticity

The Influence Factors of Grain Integrity under the Internal Pressure Condition in SRM

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