Study of Cracked Unidirectional Glass Fiber-reinforced Composites by Digital Speckle Correlation Method

摘要

Deformation and fracture behavior of glass fiber-reinforced composites with single-edge crack under tensile loading is studied by means of the traditional stress measurement method combined with digital speckle correlation method.After capturing the deformation image of the crack tip in different loading processes,the horizontal and vertical displacement fields are obtained.At the same time,using a three-element strain gauge,the strain responses near the crack tip during the whole damage and fracture process of the tensile specimen are recorded.The width of the local deformation region at the crack tip of the glass fiber-reinforced composite materials is determined.Then the analyses of deformation and fracture in a unidirectional fiber-reinforced composite are performed.These results play an important role in understanding the deformation and fracture mechanism of the unidirectional glass fiber-reinforced composite materials.