Confined compression: A stable homogeneous deformation for constitutive characterization

Ma, Zhi; Ravi‐Chandar, K.

doi:10.1007/bf02327546

Cited by 57 publications

(42 citation statements)

References 3 publications

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“…The multiaxial confined compression test method used for this study corresponds to a method described in detail by Ma and Ravi-Chandar [16] and Qvale and Ravi-Chandar [17]. In this configuration the specimen is surrounded by a confining cylinder, which restrains the free lateral expansion during axial loading without prohibiting it totally.…”

Section: Materials and Experimentalmentioning

confidence: 99%

Multiaxial yield behaviour of polypropylene

Jerabek

Tscharnuter

Major

et al. 2010

EPJ Web of Conferences

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Abstract. In order to characterize the yield behavior of polypropylene as a function of pressure and to verify the applicability of the Drucker-Prager yield function, various tests were conducted to cover a wide range of stress states from uniaxial tension and compression to multiaxial tension and confined compression. Tests were performed below and above the glass transition temperature, to study the combined effect of pressure and temperature. The pressure sensitivity coefficient as an intrinsic material parameter was determined as a function of temperature. Increasing pressure sensitivity values were found with increasing temperature, which can be related to the change in the free volume and thus, to the enhanced molecular mobility. A best-fit Drucker-Prager yield function was applied to the experimental yield stresses and an average error between the predictions and the measurements of 7 % was obtained.

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Section: Materials and Experimentalmentioning

confidence: 99%

Multiaxial yield behaviour of polypropylene

Jerabek

Tscharnuter

Major

et al. 2010

EPJ Web of Conferences

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“…Ma et al 24 used 4340 steel sleeves to study multiaxial deformation behavior of a polymer, namely, polycarbonate. The materials used in these studies had relatively low strength, in which case the sleeves experienced only elastic deformation during the entire compression process.…”

Section: Radial Confinementmentioning

confidence: 99%

Pressure-dependent flow behavior of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk metallic glass

Ravichandran

2003

J. Mater. Res.

117

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An experimental study of the inelastic deformation of bulk metallic glass Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 under multiaxial compression using a confining sleeve technique is presented. In contrast to the catastrophic shear failure (brittle) in uniaxial compression, the metallic glass exhibited large inelastic deformation of more than 10% under confinement, demonstrating the nature of ductile deformation under constrained conditions in spite of the long-range disordered characteristic of the material. It was found that the metallic glass followed a pressure (p) dependent Tresca criterion ‫ס‬ 0 + ␤p, and the coefficient of the pressure dependence ␤ was 0.17. Multiple parallel shear bands oriented at 45°to the loading direction were observed on the surfaces of the deformed specimens and were responsible for the overall inelastic deformation.

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“…Ma and Ravi-Chandar [39] developed a method for characterizing the multiaxial stress-strain behavior of materials under confinement using uniaxial compression. Figure 3.2 shows a schematic of the confined compression apparatus after Ma and Ravi-Chandar.…”

Section: Methods Of Confined Compressionmentioning

confidence: 99%

Mechanics of Granular Materials: Experimentation and Simulations for Determining the Compressive and Shear Behaviors of Sand at Granular and Meso Scales

Komanduri¹,

Lu²,

Subramanian³

et al. 2011

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We present the results of experiments conducted to study the compressive and shear behavior of sand. Static and dynamic studies on the compression of sand grains were conducted. Nanoindentation was performed on single grains on sand of different sizes in order to determine the elastic and fracture properties of individual sand grains. Finite Element method (FEM) was used to solve the inverse problem so as to obtain the material properties from the load-displacement curves obtained from nanoindentation experiments. We also report the results of quasi-static compression tests conducted on sand held in a passive confinement. An in-house built compression fixture enabled the compression of sand grains up to axial stresses as high as 3 GPa. The results of tests conducted to study the dynamic behavior of ensemble to sand grains to compressive loading are also presented. Dynamic compression tests at strain rates of ∼700 s −1 were performed using a split Hopkinson pressure bar (SHPB). Characterization of sand grains based on initial packaging density, moisture content and different confinement materials were performed. In-situ quasi-static compression of sand grains along with X-ray micro-computed tomography was performed. Images from the tomographs were combined with the axial stress-strain data to explain various phenomenon such as re-arrangement and eventual fracture of grains during compression. Results obtained from various experiments performed in the course of this study would serve to validate the analytical models on mechanical behavior of sand. IntroductionGranular or particulate materials are ensembles of discrete macroscopic particles that respond to external forces only via inter-particle contact forces. They resemble solids as they behave rigidly under compression due to grain interlocking. Due to discrete and unbonded nature of the grains, they cannot withstand any load under tension. When the interlocking between the grains collapse, they lose resistance to shear loading and exhibit flow behavior similar to that of a viscous fluid. The solid-liquid transitional behavior of 2 the granular materials can be observed in grains stored in silos to landslides. They resemble liquids by assuming the shape of the container that they are stored and resemble gases as they lack intergranular cohesion. Jaeger et al. describe granular materials as "unusual" solids, liquids or gases [31]. They describe granular materials as a unique state of matter. The study of granular materials is currently active in various fields of engineering and sciences; including physics, geophysics, mechanics, and pharmaceuticals. Sand is a granular material found abundantly in nature. It has a hard structure with particle size varying between 7.5 µm and 4.75 mm. It primarily consists of silica (SiO 2 ) while other constituents, such as magnetite, gypsum, chlorite are present in minor quantities and vary from one geographic location to the other. Sand is usually described by their composition, morphology (shape), size, color, and text...

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Confined compression: A stable homogeneous deformation for constitutive characterization

Cited by 57 publications

References 3 publications

Multiaxial yield behaviour of polypropylene

Multiaxial yield behaviour of polypropylene

Pressure-dependent flow behavior of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk metallic glass

Mechanics of Granular Materials: Experimentation and Simulations for Determining the Compressive and Shear Behaviors of Sand at Granular and Meso Scales

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Confined compression: A stable homogeneous deformation for constitutive characterization

Cited by 57 publications

References 3 publications

Multiaxial yield behaviour of polypropylene

Multiaxial yield behaviour of polypropylene

Pressure-dependent flow behavior of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass

Mechanics of Granular Materials: Experimentation and Simulations for Determining the Compressive and Shear Behaviors of Sand at Granular and Meso Scales

Contact Info

Product

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Pressure-dependent flow behavior of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk metallic glass