Shear band formation in thermal viscoplastic materials

Shawki, T.G.; Clifton, R. J.

doi:10.1016/0167-6636(89)90003-3

Cited by 120 publications

(61 citation statements)

References 58 publications

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“…5.1.1 Thermal softening Localisation of deformation in rate insensitive, plastic materials has had a long history of study (see the detailed review by Shawki and Clifton, 1989). Localisation occurs in these materials once the mathematical conditions for bifurcation are satisfied.…”

Section: Softening Of An Elastic-viscous Materialsmentioning

confidence: 99%

Acceleration of slip motion in deep extensions of seismogenic faults in and below the seismogenic region

2014

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This paper addresses concepts presented in Session 7 of the conference on "Slip and Flow Processes Near the Base of the Seismogenic Zone" held at Sendai, Japan in November, 2001. The questions raised in this session were associated with the downward extensions of seismic faults into the lower crust. The important issue is whether asiesmic slip accelerates on downward extensions prior to large earthquakes on the upper, seismic part. If this is the case, then such movement may be measurable as a precursor to large seismic events as accelerated tilt and/or distortion at the surface. Associated issues involve the geometry of downward extensions of faults, the mechanisms of localisation in the lower crust, and the mechanisms for earthquake generation near the base of the upper crust. The outcomes from this session are that aseismic slip in the lower crust could be generated by several mechanisms of localisation including yield of an elastic-viscous-plastic material, softening (including, in particular, thermal softening) of an elastic-viscous material and ductile fracture. Fine scale modelling of localisation in the lower crust is still required to resolve the issue whether accelerated motion precedes seismic slip in the upper crust. Such modelling also demands a better understanding of crustal rheology than we have at present.

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Section: Softening Of An Elastic-viscous Materialsmentioning

confidence: 99%

Acceleration of slip motion in deep extensions of seismogenic faults in and below the seismogenic region

2014

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“…Later, the adiabatic shear banding phenomenon was dramatically demonstrated by Zener and Hollomon (1944) who noted that an increase of the strain rate tends to change the deformation conditions from isothermal to adiabatic and macroscopically homogeneous plastic deformation becomes unstable if the slope of the adiabatic stress-strain curve becomes negative. Since then, extensive research efforts have been made to understand adiabatic shear banding, see e.g, some review papers and monographs (Rogers, 1979;Shawki and Clifton, 1989;Bai and Dodd, 1992;Meyers, 1994;Ramesh, 1994;Meyer et al, 1994;El-Magd, 1997;Perzyna, 1998;Wright, 2002). It is well recognized that the primary mechanism for the formation of adiabatic shear localization is the thermomechanical mechanism.…”

Section: Introductionmentioning

confidence: 99%

Formation of adiabatic shear band in metal matrix composites

Dai

Liu

Bai

2004

International Journal of Solids and Structures

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“…Shawki and Clifton [24] have reviewed much of the literature dealing with the one-dimensional shear banding problem. Recently, there have been a few studies [B-35] of the phenomenon of shear banding in plane strain defo~ations of a thermally softening viscoplastic block.…”

Section: Introductionmentioning

confidence: 99%