STUDY ON INTERFACE COMPATIBILITY OF HIGH-PERFORMANCE FIBER AND EPOXY RESIN BASED ON TEST OF NOL RINGS

Abstract

Abstract: The interface of fiber and resin exerts an outstanding influence on the entire mechanical properties of composite. Macromechanics test based on NOL rings is commonly used to reflect interfacial adhesion property of composite, so it applies to evaluate macromechanical compatibility of fiber and resin. The experiment is conducted to probe into macromechanical compatibility of high-performance fibers, such as T700SC, T800HB and high-strength glass fiber, and epoxy resins. The specimens of NOL rings were firstly prepared referrings to national standards GB/T 1458—2008. Then, we analyzed the causes of differences on macromechanical properties of matching combinations of high-performance fibers and epoxy resins by combinations of tensile and interlaminar shear test of NOL rings with observation of its fracture surface by SEM. And the optimal matching combinations were found out. The results suggest that interfacial properties of glass fiber and epoxy resin is superior to that of epoxy with carbon fiber, and the former posseses optimal interfacial adhesion strength, and different adhesion strength leads to different mechanical properties and modes of damages. But poor interface of carbon composite easily arises delamination, which restricts the use of carbon fiber. Macromechanical compatibility of T800HB and epoxy resin is superior to that of T700SC and epoxy, and mechanical proprerties of composites and that of resin matrix are directly related. The properties of resin, surfacial structure and character of fiber and interaction between carbon fiber and resin are the ultimate cause of affecting interfacial properties. The paper plays practical significance in selection and design of materials of composite reinforced by high-performance fibers.

Key words: unidirectional composite, high-performance fibers, epoxy resin, NOL rings, properties of interfacial adhesion

CLC Number:

TB332

LAN Zong-jin, ZU Lei, HUI Peng, HU Lan-xin. STUDY ON INTERFACE COMPATIBILITY OF HIGH-PERFORMANCE FIBER AND EPOXY RESIN BASED ON TEST OF NOL RINGS[J]. Fiber Reinforced Plastics/Composites, 2018, 0(3): 45-51.

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