Abnormal effect of tensile strain on Young’s modulus of inorganic E-glass fibers

Abstract

In this work, the effect of stretching on Young's modulus of highstrength Eglass fibers was studied. An abnormal increase in Young's modulus of glass at tensile strain above 0.2% was detected. Such behavior is characteristic of oriented polymers. In elastic materials at small strains, the stress is directly proportional to the elongation and the pro� portionality factor is called Young's modulus. Young's modulus is determined by the interatomic interaction potential, which is anharmonic in crystalline materials and metals. The anharmonicity of the potential leads to a small deviation from Hooke's law as early as at an elastic deformation stage. In crystals and metals, a deviation from Hooke's law always manifests itself as a decrease in Young's modulus with increasing strain.