Behavior and properties of shear bands

Li, J. C. M.

doi:10.1002/pen.760241005

Cited by 59 publications

(27 citation statements)

References 46 publications

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“…These bands may be referred to as shear-crazes. Such formations have previously been observed [49]. However, deformation of this kind is not accompanied by a noticeable increase in sample volume, which is evident from the data on the volume strain of the deformed samples (Fig.…”

Section: Peculiarities Of Hdpe Deformation In the Liquid Medium By Thsupporting

confidence: 52%

The structural evolution of high-density polyethylene during crazing in liquid medium

Yarysheva

Rukhlya

Yarysheva

et al. 2015

European Polymer Journal

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Section: Peculiarities Of Hdpe Deformation In the Liquid Medium By Thsupporting

confidence: 52%

The structural evolution of high-density polyethylene during crazing in liquid medium

Yarysheva

Rukhlya

Yarysheva

et al. 2015

European Polymer Journal

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“…Ordinarily, one would expect brittle fracture to occur by the opening of microscopic cracks along the fault plane, while conventional plastic yielding associated with deformation of crystals is known to be pervasive and involve workhardening which seem to be incompatible with the localization of the deformation in shear bands indicating some form of work-softening. This distinct mode of shear failure is observed in a variety of materials, including some amorphous solids such as polymers [1,2,3] and bulk metallic glasses [4,5,6,7], rocks under high confining pressure [8,9,10] and crystalline solids deformed rapidly in impact experiments [11,12].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous dissipation of elastic energy by self-localizing thermal runaway

2009

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Thermal runaway instability induced by material softening due to shear heating represents a potential mechanism for mechanical failure of viscoelastic solids. In this work we present a model based on a continuum formulation of a viscoelastic material with Arrhenius dependence of viscosity on temperature, and investigate the behavior of the thermal runaway phenomenon by analytical and numerical methods. Approximate analytical descriptions of the problem reveal that onset of thermal runaway instability is controlled by only two dimensionless combinations of physical parameters. Numerical simulations of the model independently verify these analytical results and allow a quantitative examination of the complete time evolutions of the shear stress and the spatial distributions of temperature and displacement during runaway instability. Thus we find that thermal runaway processes may well develop under nonadiabatic conditions. Moreover, nonadiabaticity of the unstable runaway mode leads to continuous and extreme localization of the strain and temperature profiles in space, demonstrating that the thermal runaway process can cause shear banding. Examples of time evolutions of the spatial distribution of the shear displacement between the interior of the shear band and the essentially nondeforming material outside are presented. Finally, a simple relation between evolution of shear stress, displacement, shear-band width and temperature rise during runaway instability is given.

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“…In particular, shear yield ing, 12 сrazing, 13 and necking 14 processes exist under vari ous conditions (in some cases, coexist). The three types of inelastic deformation have much in common, because they are based on the same structural modifications at the molecular level.…”

Section: Spatial Nonuniformity Of the Plastic Deformation Of Polymersmentioning

confidence: 98%