Fundamento geométrico y cinemático de la modelización teórica y experimental de deformaciones no-coaxiales

Abstract

Combination of both longitudinal components with a shear component parallel to the direction of the longitudinal extension component leads to a continuum spectrum with pure and simple shear as end members. The degree of non coaxiality or the vorticity can be specified by means of the angle formed by lines undergoing no rotation. The application of successive identical strain increments, keeps unchanged the orientation of the lines of no rotation after the first increment. On this basis two approaches are presented in order to enhance understanding of the formation of ductile structures under non coaxial strain regimes: experimental modelling using analogue materials and deformation stage, which should cover the whole spectrum between pure and simple shear. Additionally, by means of two examples of mathematical modelling it is shown how the non coaxiality controls fold asymmetry and orientation.