Adiabatic Shear Localization by Yilong Bai

By Yilong Bai

Adiabatic shear localization is a method of failure that happens in dynamic loading. it truly is characterised by way of thermal softening taking place over a really slim area of a cloth and can be a precursor to ductile fracture and catastrophic failure. This reference resource is the revised and up to date model of the 1st targeted research of the mechanics and modes of adiabatic shear localization in solids. development at the luck of the 1st variation, the booklet presents a scientific description of a couple of features of adiabatic shear banding. The techniques and strategies defined during this paintings can usefully be utilized to unravel a large number of difficulties encountered via these investigating fracture and harm in fabrics, effect dynamics, steel operating and different parts. particular chapters concentrate on lively fabrics, polymers, bulk steel glasses, and the maths of shear banding in addition to the numerical modeling of them. With its exact assurance of the topic, this booklet is of significant curiosity to teachers and researchers into fabrics functionality in addition to professionals.

  • Up-to-date insurance of the topic and examine that has happened over the last 20 years
  • Each bankruptcy is written on a distinct sub-field of adiabatic shear via an said professional within the field
  • Detailed and transparent discussions of every aspect

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It was found deformed as well as transformed (white etching) bands in all material conditions. Their occurrences depend on a critical strain and strain rate. Wei et al. [69] performed dynamic compression tests on a tungsten heavy metal alloy on a Hopkinson bar. They varied the specimen geometry with a classical cylindrical form, a conical form and a stepped form. With both the latter geometries, the adiabatic shear failure is more probable. 20 Experimental set-up for high strain-rate compression test by direct Hopkinson bar, according to Odeshi et al.

121]. Pn V narrow to keep the bending influences of the results on a low level. The failure begins at the groove with unknown local stress distributions. At large deformations, a pure shear deformation cannot be ensured. Because of the uncertainties of stress state in the groove and the inhomogeneous shear strain distribution, the double-notched shear test is not widely used. Single-Edge and Double-Edge Specimen Special specimen geometries are the single-edge and double-edge notch specimen. Both geometries can be designed only with a slit or an additional fatigue crack.

41 Indenter test: (A) before impact and (B) after impact, according to Chou et al. [113]. 42 Transformation shear band (white etching band) in steel at indenter test, according to Rogers [6]. 200 μm Bai and Dodd [8] describe results of a 4340 steel where the hardness condition with 20 HRC has not sheared, and the material with high hardness of 52 HRC is sheared in a stepped projectile indenter test. Irick et al. 44. 43 Intender test arranged in a Hopkinson bar apparatus, according to Meyer and Manwaring [114].

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