Principal strain-induced fiber orientation evolution in the Csf/Mg composites with a large deformation

In this article, the fiber orientation evolution in the C-sf/Mg composites with a large deformation is investigated. The principal strain-induced fiber orientation evolution mechanism, which states that the fiber orientation evolution in the C-sf/Mg composites with a large deformation is determined by the principal strains, is proposed. The fiber orientation distribution factors F-i (i = 1, 2 and 3) taking the form of the principal strains are proposed to quantitatively characterize the fiber orientation distribution in the C-sf/Mg composites. The fiber orientation factors F-i(s) predicted by the finite element simulation based on the principal strain-induced fiber orientation evolution mechanism are compared against those F-i(m) measured from the micrographs of the extrusion experiments of C-sf/Mg composites. The results demonstrate that the principal strain-induced fiber orientation evolution mechanism is valid and convenient to predict the fiber orientation evolution in the C-sf/Mg composites with a large deformation. In the extruded C-sf/Mg composites, the fibers are reoriented toward the direction of the maximum principal strain and deviated from the direction of the minimum principal strain.