Abstract
Direct compression test of a single carbon fiber was performed by originally developed testing machine. The maximum displacement of the testing machine was 200μm with 5nm step and maximum load was 200mN with 0.3mN resolution, Carbon fiber with 5μm diameter was fixed on a base using an epoxy and then cut into 10μm length using a focused ion beam to prevent buckling in the compression test. Measured compressive strength of the carbon fiber was about 3000MPa which was much lower than the tensile strength 5880MPa. Fracture surface of the carbon fiber showed ending fracture which may reduce measured compressive strength. Young's modulus of the carbon fiber was not obtained because of relatively high compliance of the test fixture. The experimental results imply the need for some modification of the test apparatus to correctly measure the compression property of a single carbon fiber.
Published Version
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