An investigation on a new creep constitutive model and its implementation with the effects of time- and temperature-dependent Poisson’s ratio

Cui, Huiru; Shen, Zhi-Bin

doi:10.1007/s00707-018-2251-y

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…The transfer of stress and strain between the case and the propellant depends on the good buffering effect of the insulation. During storage and use, the coated charge must withstand a variety of stresses, including thermal stress caused by changes in ambient temperature, internal stress caused by the mass of the propellant or charge structure, and stress caused by overloads such as vibration and impact during engine ignition [1], transportation, and rocket flight [2]. The coating must maintain good mechanical properties to effectively reduce the external impact and protect the propellant from destruction in storage and transportation.…”

Section: Introductionmentioning

confidence: 99%

The aging property and storage life prediction of EPDM

shuang-hong,

chang-sheng,

chao-fan

2023

J. Phys.: Conf. Ser.

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The performance change of Ethylene propylene diene monomer (EPDM) was studied by the accelerated aging experimental method, and its lifespan was predicted. The results showed that the thermal oxidation aging of EPDM is dominated by the crosslinking reaction. With the extension of the thermal oxidation aging time, the total crosslinking density and tensile permanent deformation gradually decrease, while the tensile strength and hardness increase gradually. The life prediction formula of EPDM under the thermal-oxidative aging condition was obtained by the linearization method of the kinetic curve. When tensile permanent deformation was used as the evaluation index, the life was 30 a at the temperature of 296.15 K.

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Section: Introductionmentioning

confidence: 99%

The aging property and storage life prediction of EPDM

shuang-hong,

chang-sheng,

chao-fan

2023

J. Phys.: Conf. Ser.

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“…The mechanical properties of NEPE propellant not only have the viscoelastic properties such as rate dependence, historical dependence and relaxation, but also have the properties of super elastic materials such as large elongation and basically restoring the original length after deformation. A viscoelastic hyperelastic constitutive model composed of a rate independent hyperelastic constitutive model and a rate dependent viscoelastic constitutive model had been proposed [19,20]. The viscoelastic constitutive model of rubber material under high strain rate was proposed, which was in good agreement with the results of uniaxial tests [21].…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties of solid propellant NEPE

Qian

Fang

et al. 2023

Propellants Explo Pyrotec

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Nitrate ester plasticized polyether (NEPE) propellants, are high energy solid propellants that are used widely in solid rocket motor. It is necessary to study the mechanical properties of NEPE propellants in order to ensure an accurate prediction of the performance of solid rocket motors and ensure the safety of launch platforms.We studied the viscoelastic hyperelastic constitutive model of NEPE propellants. The speckle defocusing method and digital image correlation(DIC) method are used to obtain the strain of solid propellant NEPE in three directions during unidirectional stretching, and the volume change rate, Poisson's ratio and true strain curves of NEPE under different stretching rates are obtained. With the increase of loading rate, the maximum stress that NEPE can encounter increases, and the modulus at the initial elastic stage also increases. At the initial stage of stretching, the volume change rate is close to 1, the Poisson's ratio fluctuates within a range close to 0.5. When the engineering principal strain in the tensile direction reaches a certain value, the volume change rate begins to increase and the Poisson's ratio begins to decrease. The strain of solid propellant NEPE in three directions during uniaxial tension was successfully measured by speckle defocus method and digital image correlation (DIC) method. NEPE is close to being a super elastic material at the initial stage of stretching. The change trend of the volume change rate curve of different loading rates is consistent, and the stretching rate has no effect on the volume change rate of NEPE.

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“…Structure integrity as well as the physical response of different designs will be evaluated by the numerical simulation during the design stage to reduce the cost of production. Poisson's ratio of solid propellant is one of the main input parameters which will strongly affect the structural response, especially during the ignition period [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Viscoelastic Poisson’s Ratio of Composite Materials considering the Effects of Dewetting

Cui

Wei-li

Lv³

et al. 2022

International Journal of Aerospace Engineering

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A direct numerical method is introduced herein to investigate time-dependent Poisson’s ratio of solid propellant based on a representative volume element (RVE) model. Time-dependent longitudinal and transverse strains are considered in the calculation of time-dependent Poisson’s ratio under the relaxation test. The molecular dynamics (MD) packing algorithm is used to generate the high area fraction RVE model of solid propellants consisting of ammonium perchlorate (AP) particles whose radius follows lognormal distribution. In order to simulate the dewetting response of the interface between particles and matrix, the PPR model is modified and utilized during the analysis. Time-dependent Poisson’s ratio is measured under different cohesive parameters, loading conditions (loading temperature, loading rate, and fixed strain), and area fraction. Numerical results reveal that time-dependent Poisson’s ratio can be nonmonotonic or monotonic according to the different cohesive parameters. A concept of critical cohesive parameters is proposed to judge whether the monotonic property of time-dependent Poisson’s ratio appears or not. According to the numerical analysis, the cohesive contact and the shrinkage of the bulk element are two main factors which will control the change of monotonic property. All time-dependent Poisson’s ratios will increase at the beginning of the relaxation stage because the effects of cohesive contact can be ignored compared with the large shrinkage of the bulk element. However, with the increased shrinkage of the bulk element, the increased cohesive contact will defend further shrinkage at the same time. Although the shrink of the bulk element never changes its direction, the ratio of the transverse strain to longitudinal strain may decrease or keep increasing in this stage. When transverse and longitudinal strains stop to change, all time-dependent Poisson’s ratios will achieve their equilibrium values.

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An investigation on a new creep constitutive model and its implementation with the effects of time- and temperature-dependent Poisson’s ratio

Cited by 6 publications

References 25 publications

The aging property and storage life prediction of EPDM

The aging property and storage life prediction of EPDM

Study on mechanical properties of solid propellant NEPE

Investigation on Viscoelastic Poisson’s Ratio of Composite Materials considering the Effects of Dewetting

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