Experimental Investigation of the Failure Mechanisms of Fiber Reinforced Composites Subjected to Uniaxial Tension.

摘要

In the investigation the distribution of the axial component of displacement in the plane of thin, unilayer,fiber-reinforced composite plates subjected to quasi-statically increasing tension (from zero to failure) in the direction of the fibers,is established experimentally. The experimental results are used to (a) evaluate the strain distribution throughout the surface of the speciments during the process of loading; (b) establish the strain concentration in the neighborhood of broken fibers; (c) estimate the distribution of the normal component of strain in the fibers; (d) establish the ineffective length of broken fibers and the stress concentration in neighboring fibers as functions of the applied load. The experimental results are compared with those obtained on the basis of a theoretical analysis for establishing the distribution of stress in unilayer fiber reinforced plates,subjected to uniaxial tension in the direction of the fibers. The experimental results present new insight on the influence of the ineffective length of broken fibers on the strength of fiber reinforced composites. (Author)