In this article, the fiber orientation evolution in the Csf/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 Csf/Mg composites with a large deformation is determined by the principal strains, is proposed. The fiber orientation distribution factors taking the form of the principal strains are proposed to quantitatively characterize the fiber orientation distribution in the Csf/Mg composites. The fiber orientation factors predicted by the finite element simulation based on the principal strain-induced fiber orientation evolution mechanism are compared against those measured from the micrographs of the extrusion experiments of Csf/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 Csf/Mg composites with a large deformation. In the extruded Csf/Mg composites, the fibers are reoriented toward the direction of the maximum principal strain and deviated from the direction of the minimum principal strain.
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