Research on Microscopic Damage of GFRP Tensile Properties

The tensile failure of fiber reinforced composite is a progressive damage process. Combined with microscopic analysis measures to study matrix, fiber and interface, the failure mechanism of material would be further researched. Two different types of matrix of GFRP bars were selected in the tensile test. The results of tensile test and SEM observations revealed: the vinyl GFRP bar has better composite material structure and interface than unsaturated polyester, and the progressive damage level of unsaturated polyester bar is higher than vinyl in the same stress state; There are clear links between the tensile strength and meso-structure change with different uniaxial stress; When the load exceeds 80% of the failure load, the meso-structure exhibit obvious split between fiber and matrix, and body damage and stripping between fiber and matrix are correlative.