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Features of the rolling method of production of sheet steel
Published in V. L. Mazur, O. V. Nogovitsyn, Theory and Technology of Sheet Rolling, 2019
The uneven distribution of the interturn pressures across the width of the strip can be associated with local disturbances in its profile and shape, for example, due to the distortion of the cross-sectional profile in the edge zones of the rolls. In these areas, the formation of kinks is possible due to local coalescence of the turns during annealing. When winding strips with a wedge-shaped cross-section, the uneven distribution of pressure along the width of the strip can reach such a degree that it will cause the appearance of a ‘bird’ on the side of the thickened edge. This question, due to its importance, will be considered below in further detail.
Introduction to Polyurethanes
Published in I.R. Clemitson, Castable Polyurethane Elastomers, 2015
The pipelines used to convey compressed air or nitrogen must be designed to carry pressure. Low-pressure flexible PVC tubing is not suitable. Where the gasses are carried for long distances, solid metal lines with take-off junctions should be provided. Flexible lines should be kept clear of heated ovens and open flames. Kinks and other mechanical damage should be avoided and when it occurs, it should be immediately repaired.
A 3D progressive failure model for crushing simulations in composite structures
Published in International Journal of Crashworthiness, 2022
Sérgio Augusto Capasciutti de Oliveira, Maurício Vicente Donadon
Fibre kinking occurs due to shear deformation leading to a kink band formation, where the collapse of the fibres aligned to the compressive load application is caused by the matrix dominated stresses inside the kinking band, according to the work of Dávila and Camanho [27]. The collapse of the fibre is due to its rotation, where an initial angular displacement is present as a result of manufacturing process of such a material. In their publication concerning the fibre kinking, Pinho et al. [28] considered an initial misalignment as material property and stress transformations were performed to search the so-called kink plane and therefore the kink band. Once the kink band is defined, matrix failure criteria either in tension and compression are verified inside the kink band. After fibre kink onset is met, Pinho et al. [28] perform the stresses degradation by means of strains in the kinking band, where a specific damage parameter for such a failure is computed. In their subsequent work, Pinho et al. [29] implemented this model as user defined material model, within LS-DYNA finite element code, where fairly good agreement between numerical predictions and experimental results in terms of load-displacement and failure morphology was found for plate-like laminates.
On spatio-temporal dynamics of sine-Gordon soliton in nonlinear non-homogeneous media using fully implicit spectral element scheme
Published in Applicable Analysis, 2021
Kinks are spatially localized formation which moves freely in both directions. As a physical example, kink can represent dislocation in solids. Kinks with same sign interact with each other elastically, whereas kinks with opposite sign can cross each other without changing their sign, see the text written by Lamb [66] and Dodd et al. [67] for more details. Solution of kink is given by , where is the Lorentz factor and constant c represents velocity of the kink.