What is shear band in soil?

A shear band (or, more generally, a ‘strain localization’) is a narrow zone of intense shearing strain, usually of plastic nature, developing during severe deformation of ductile materials. As an example, a soil (overconsolidated silty-clay) specimen is shown in Fig. 1, after an axialsymmetric compression test.

What is meant by shear bands?

Shear bands are mesoscopic band-like deformation inhomogeneities in middle and heavily deformed metallic alloys. They appear under oblique angles relative to the main deformation axis and can penetrate multiple crystals in the deformation structure.

What causes shear banding?

The shear banding is a result of inhomogeneous plastic deformation when all shear plastic strain is concentrated in narrow regions while the rest of the material remains in elastic domain.

What is shear banding in polymers?

Shear banding is produced in polymers when they are exposed to compressive stresses. Small stress relieving cracks nucleate within the polymer parallel to the direction of maximum shear stress at an angle of 45°. As the number of shear bands accumulates the overall strain of the material increases.

What is adiabatic shear failure?

Abstract. Adiabatic shear banding (ASB) is a unique dynamic failure mechanism that results in an unpredicted catastrophic failure due to a concentrated shear deformation mode. It is universally considered as a material or structural instability and as such, ASB is hardly controllable or predictable to some extent.

What are slip bands?

From Wikipedia, the free encyclopedia. Lüders bands, also known as slip bands or stretcher-strain marks, are localized bands of plastic deformation in metals experiencing tensile stresses, common to low-carbon steels and certain Al-Mg alloys.

What is crazing in composites?

Crazing develops when excessive tensile stress is applied to a polymer, leading to microvoid formation in a plane normal to the stress. 8,11,16,26. The voids initiate at microscopic inhomogeneities in the polymer, and are stabilised by fibrils of plastically deformed polymer chains.

What is persistent slip band?

In the light of current knowledge, the persistent slip band can be defined as a zone that fulfils three conditions. There is a cyclic strain localization in this zone. Its dislocation structure differs from that in the surrounding matrix.

What are slip bands and slip lines?

Atoms in a metal move an integral number of atomic distances along the slip plane to result in producing a step. Each step appears as a line called slip line. Slip does not occur on just one plane but over small regions of parallel planes to result in a number of slip lines, together called slip band, Fig. 6.14 (b).

What crazing means?

verb (used with object), crazed, craz·ing. to derange or impair the mind of; make insane: He was crazed by jealousy. to make small cracks on the surface of (a ceramic glaze, paint, or the like); crackle.

What is slip band?

Lüders bands, also known as slip bands or stretcher-strain marks, are localized bands of plastic deformation in metals experiencing tensile stresses, common to low-carbon steels and certain Al-Mg alloys.