From the aspect of suitability for a particular use, an engineer- ing material needs to be evaluated by answering two questions: To what extent the material resist the deforming force that will be applied? and to what extent will the material recover when the deforming force is removed [1]? Therefore, the mechanical beha- vior of fiber assemblies is of great interest in many fields of engineering such as fiber reinforced composites, paper, and textiles manufacturing.