The shear banding mechanism is introduced in the current section and void formation will be discussed in the subsequent section. 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.
Moreover, what is meant by crazing in polymers?
Crazing is the phenomenon that produces a network of fine cracks on the surface of a material, for example in a glaze layer. Crazing frequently precedes fracture in some glassy thermoplastic polymers.
In respect to this, what is shear banding fluid?
Shear banding occurs when a fluid can support two different states of apparent viscosity for either the same shear rate (different local stresses) or the same shear stress (different local strain rates).
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 shear deformation?
Shear deformation occurs when an object changes shape because forces are applied to it and does not just become longer or shorter. The force F produces a deformation of the shape. … If the object undergoing deformation is elastic, the Shear Stress is proportional to the Shear Strain.
What is strain Localisation?
Strain localization is a ubiquitous feature of elastoplastic materials undergoing nonhomogeneous de- formation. The phenomenon manifests in the form of a shear band, a narrow zone of intense straining across which some kinematical fields in a deforming body may be discontinuous.