Stress transfer in high performance polyethylene fiber reinforced epoxy resin composite analyzed by X-ray diffraction
- In the direction parallel to the fiber axis -
Nishino Takashi; Nakamura Kei; Nakamae Katsuhiko
Abstract:Stress transfer parallel to the axis of high performance polyethylene fibers in a fiber reinforced epoxy resin composite was investigated by X-ray diffraction. Internal stress sf in the embedded fiber could be measured by monitoring the longitudinal strain of the crystalline regions of polyethylene by X-ray diffraction. The stress sf increased linearly with external stress applied to the composite. This behavior was in agreement with the rule of mixture of mechanical reinforcement and independent of interfacial adhesion. The mechanical reinforcement was dependent on the mechanical properties of both fiber and matrix, and also a fiber volume fraction. Interfacial adhesion and the existence of fiber ends influenced the mechanical properties of large deformation such as tensile strength. The 'X-Ray Diffraction Method' proved to be a powerful tool for detecting the stress on the incorporated fiber in the loaded composite in situ and non destructively. Key Words:stress transfer, composite, X-ray diffraction, high performance polyethylene, rule of mixture, reinforcement