Comparison of the finite strain macroscopic behavior and local damage of a soft matrix highly reinforced by spherical or polyhedral particles

Francqueville, Foucault de; Pierre, Guillaume; Diani, Julie; Vandenbroucke, Aude

doi:10.1016/j.euromechsol.2020.104070

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…In order to describe the mechanical properties of interfaces, the bilinear cohesive zone model (BCZM) was introduced in this work due to its highly efficient and simple formula. 18,35,[37][38][39] The BCZM theory assumes that interface mainly goes through three stages: (1) elastic stage: interface stress has a linear increasing relation with opening displacement; (2) Damage softening stage: when interface stress reaches maximum strength, interface damage would germinate and evolve. At this stage, interface stress decreases linearly with the increase of opening displacement; (3) Failure stage: when opening displacement reaches critical failure value, interface stress drops to zero and interface completely fails.…”

Section: Computational Modelmentioning

confidence: 99%

Mechanical properties and influence mechanism of hydroxyl‐terminated polybutadiene propellant under confining pressure

Tingyu

Chen

et al. 2023

J of Applied Polymer Sci

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To better understand the mechanical properties and influence mechanism of hydroxyl-terminated polybutadiene (HTPB) propellant under various confining pressures, the uniaxial tension tests with low to medium strain rate and various confining pressures were carried out. The coupling effects of strain rate and confining pressure on mechanical properties were presented. Meanwhile, the confining pressure influence mechanism was analyzed and revealed using the meso numerical simulation method and scanning electron microscopy images of fracture surfaces. The meso damage evolution processes under various confining pressures were presented. The results show that strain rate and confining pressure affect mechanical responses of HTPB propellant significantly. As confining pressure increases, the maximum tension strength and fracture strength increase. The maximum tension strain and failure strain vary slightly with confining pressure under low strain rate, while they increase significantly with confining pressure at medium strain rate. The fracture energy density increases with the increase of strain rate and confining pressure. Meanwhile, the value of saturation pressure depends on strain rate. The confining pressure influence mechanism is to suppress dewetting damage initiation and evolution. Besides, the failure mode of HTPB propellant under different confining pressures is still particles dewetting.

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Section: Computational Modelmentioning

confidence: 99%

Mechanical properties and influence mechanism of hydroxyl‐terminated polybutadiene propellant under confining pressure

Tingyu

Chen

et al. 2023

J of Applied Polymer Sci

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“…To provide a rationale on these experimental results, finite element simulations have been run on representative volume elements made of polyhedral particles randomly dispersed in a soft hyperelastic matrix with an account of possible matrix/filler interfacial damage thanks to CZM elements. A specific effort has been carried on the generation of representative microstructures with a relatively high volume fraction of fillers (up to 55%), randomly dispersed to avoid undesired anisotropy (de Francqueville et al, 2020b). Fillers are non regular polyhedra randomly translated and rotated to avoid possible numerical bias in damage appearance due to similar parallel edges facing each others.…”

Section: Micro-scale Observations Of the Matrix/filler Debondingmentioning

confidence: 99%

“…This provides with spherical displacement. The model equations are detailed in de Francqueville et al (2020b). For simplicity reasons and in order to reduce the number of adjustable parameters, the normal and tangent behaviors have been assumed similar.…”

Section: Computational Frameworkmentioning

confidence: 99%

“…Finally, random rotations and translations of the polyhedra have been added in order to avoid regular planes facing each other and obtain a more realistic virtual material. The procedure inspired by Fritzen et al (2009) is detailed in de Francqueville et al (2020b). For the finite elements analyses, the meshing was carried out with Netgen software (Schöberl, 1997) and calculations were run on Abaqus (2018).…”

Section: Linear Behaviormentioning

confidence: 99%

“…Mesh failures could be obtained when a polyhedron vertex was too close to an edge, face or vertex of any other polyhedron or of the cubic cell. A strategy, inspired by Quey et al (2011), that creates new tiny faces at the polyhedron vertices creating the difficulties, was applied as one can read in de Francqueville et al (2020b). Representative meshed microstructures are shown in Fig.…”

Section: Linear Behaviormentioning

confidence: 99%

See 2 more Smart Citations

Use of a micromechanical approach to understand the mechanical behavior of solid propellants

Francqueville

Diani

Pierre

et al. 2021

Mechanics of Materials

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The development of new generations of propellants with better energetic properties may be hampered by unsatisfactory mechanical behaviors in terms of strength and toughness. A micromechanical approach is adopted to provide a better understanding of the existing links between the constitutive phase behaviors and the local damage, and the macroscopic mechanical behavior of these materials. Three model materials have been made and tested in uniaxial tension. The stress-strain responses were recorded while monitoring their volume changes that quantify the macroscopic damage. A qualitative description of the local damage was obtained thanks to scanning electron microscopy images of samples under loading. The micromechanical approach consists in finite elements analyses on periodic microstructures of non-regular polyhedral particles embedded in a soft matrix. An original microstructure generation tool has been developed specifically in order to obtain highly filled isotropic microstructures. Debonding at the matrix/filler interface was taken into account with a cohesive-zone model (CZM). The impact of the CZM parameters is discussed, in an effort to make the link between the CZM parameters and how the local damage appears and develops, and between the cohesive behavior and the shape of the macroscopic stress-stretch responses of the heterogeneous materials.

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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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Comparison of the finite strain macroscopic behavior and local damage of a soft matrix highly reinforced by spherical or polyhedral particles

Cited by 12 publications

References 35 publications

Mechanical properties and influence mechanism of hydroxyl‐terminated polybutadiene propellant under confining pressure

Mechanical properties and influence mechanism of hydroxyl‐terminated polybutadiene propellant under confining pressure

Use of a micromechanical approach to understand the mechanical behavior of solid propellants

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

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