Prestrained biaxial DMA investigation of viscoelastic nonlinearities in highly filled elastomers

Jalocha, D.; Constantinescu, Andréï; Nevière, Robert

doi:10.1016/j.polymertesting.2015.01.005

Cited by 24 publications

(10 citation statements)

References 23 publications

(39 reference statements)

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“…Moreover, the modification of the behavior under a horizontal prestrain was canceled out by an increase of the vertical prestrain, a phenomenon that may be explained by the alignment of the fillers with the prestrain. The experimental results of a complete biaxial prestrained DMA experiment have been recently reported in Jalocha et al (2015b). The experiments on propellant specimen confirmed the previous results.…”

Section: Introductionsupporting

confidence: 80%

Prestrain-dependent viscosity of a highly filled elastomer: experiments and modeling

Jalocha

Constantinescu

Nevière

2015

Mech Time-Depend Mater

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International audienceHighly filled elastomers exhibit a complex microstructure made up of rigid fillers bounded by a thin layer polymeric matrix. The interactions between the fillers and the binder amplify locally the applied strains and induce a nonlinear viscoelastic behavior. The aim here is to analyze the influence of prestrain on the viscoelastic behavior. This paper proposes a prestrain-dependent viscoelastic constitutive model. The model is a superposition of three relaxation spectra, each corresponding to a family of polymer chains, and can be regarded in either its continuous or discrete expression. More specifically, one of these relaxation spectra is modified to assure the prestrain sensitivity. The parameters of the discrete model are identified from relaxation and DMA experiments performed on a solid propellant, and the obtained predictions match closely the experiments. The novelty of the analysis proposed in this paper is threefold. On the one hand, we report a new series of experimental measures, performed for a large range of frequencies for the DMA experiment and relaxation times for the relaxation experiment, and, on the other hand, we propose a constitutive law compatible with the principles of thermodynamics, which predicts closely the measurements. Finally, the analysis is performed comparing both relaxation and DMA experiments using the spectrum of relaxation times. A peculiarity of the present discussion is the novel identification method used, which identifies directly the relaxation times. This technique leads to models with smaller and optimum numbers of parameters than classical methods based on a logarithmic distribution of relaxation times

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Section: Introductionsupporting

confidence: 80%

Prestrain-dependent viscosity of a highly filled elastomer: experiments and modeling

Jalocha

Constantinescu

Nevière

2015

Mech Time-Depend Mater

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“…Equation ( 8) is a ternary equation about mechanical property parameters b, b and Y. The scatter diagrams of ultimate normal stress and ultimate shear stress under different loading angles can be fitted based on equation (8), and the specific values of the twin-shear unified strength criterion parameters of HTPB propellant under certain loading conditions can be obtained. Five loading angles are selected to carry out experiments in this research.…”

Section: Resultsmentioning

confidence: 99%

“…The theoretical biaxial strength criterion of HTPB propellant under dynamic loading was constructed with the unified strength theory, the uniaxial strength and the typical biaxial tensile strength. Jia [7] and Jalocha [8] conducted experiments on biaxial tensile mechanical properties of solid propellant based on cruciform specimen. At present, the failure criterion of propellant under triaxial stress state is mainly studied by confining pressure loading due to the triaxial test of propellant is difficult to carry out.…”

Section: Introductionmentioning

confidence: 99%

Strength Criterion of HTPB Composite Solid Propellant under Tension‐Shear Loading at Low Temperature

Wang

2022

Propellants Explo Pyrotec

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The strength limits of composite solid propellants are different at different temperatures and loading states.To study the ultimate bearing capacity of Hydroxyl-terminated polybutadiene (HTPB) propellant, the tensile-shear loading fixture and propellant specimens were designed, and the tensile-shear tests of HTPB propellant at different temperatures (223-298 K) and strain rates (0.01-1.00 s À 1 ) were carried out. The variation of ultimate load of HTPB propellant with loading conditions was analysed. Based on the twin shear unified strength theory, the strength criterion of HTPB propellant under low temperature tension-shear load was established, and the variation of mechanical parameters and stress limit surface with temperature and strain rate were analysed. The results show that the twin shear unified strength theory can be well applied to the strength analysis of propellants. The ultimate bearing capacity of HTPB propellant is the smallest near the loading angle of 45°. The shape of strength limit surface is an equilateral semi-infinite hexahedron. With the decrease of temperature and the increase of shear rate, the strength limit surface of HTPB propellant expands outward.

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“…In addition, because the cross-shaped specimen can more accurately simulate the biaxial force state of the propellant, it has been widely used in recent years. Qiang H F 11 carried out a biaxial tensile test of HTPB propellant based on the central thinning bathtub-shaped test piece through a biaxial testing machine; Jia Y G 12 also calculated a square thinning cross-shaped test based on ANASYS simulation and carried out a biaxial tensile test of composite solid propellant; Jalocha 13 believed that the method of grooving the wall of the specimen and thinning in the central area could not effectively characterize the biaxial properties of the propellant. For this purpose, a biaxial tensile test of composite solid propellant was carried out using a non-slotted test piece with an arc transition on the wall.…”

Section: Introductionmentioning

confidence: 99%

Biaxial tensile test and meso damage numerical simulation of HTPB propellant

Wang

et al. 2022

Sci Rep

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Aiming at the shortcomings of the current research on the mechanical properties of solid propellants under complex stress conditions, an effective cross-shaped test piece configuration and variable-scale biaxial tensile test method are designed in this paper, and the meso-simulation model of propellant is constructed by Micro-CT test and random filling algorithm. Then, based on the Hook-Jeeves method and the cohesive force model, the mechanical performance parameters of each mesoscopic component were obtained, and finally the damage evolution process of the propellant was numerically simulated. The results show that the stress–strain curve of the propellant under biaxial loading is similar to that of uniaxial stretching, and has obvious rate dependence and stress state dependence. The mechanical properties of the propellant under biaxial tensile loading are significantly lower than those in uniaxial stretching, and the maximum elongation is only 45–85% of that in uniaxial stretching. The fracture process of propellant can be divided into initial linear stage, damage evolution stage and fracture stage. The dewetting phenomenon generally occurs at the interface between the large-sized AP particles and the matrix. With the loading of the load, the pores formed by the dewetting and matrix tearing continue to converge into cracks and expand in the direction perpendicular to the resultant force, and finally fracture. The propellant dehumidifies more easily under high strain rate loading, but the degree of dewetting is lower when the same strain is reached.

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Prestrained biaxial DMA investigation of viscoelastic nonlinearities in highly filled elastomers

Cited by 24 publications

References 23 publications

Prestrain-dependent viscosity of a highly filled elastomer: experiments and modeling

Prestrain-dependent viscosity of a highly filled elastomer: experiments and modeling

Strength Criterion of HTPB Composite Solid Propellant under Tension‐Shear Loading at Low Temperature

Biaxial tensile test and meso damage numerical simulation of HTPB propellant

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