| 摘要 |
A COD(Crack Opening Displacement) gauge for high temperature fracture mechanic experiments is provided to allow an observer to safely obtain data of displacement caused by crack on a load line of a sample in a furnace. A COD(Crack Opening Displacement) gauge(100) for high temperature fracture mechanic experiments comprises an upper tip portion(10), a lower tip portion(20), a guide fixing portion(30), a displacement rod fixing portion(40), and a displacement measuring portion(50). The upper tip portion comprises an upper tip(11) attached onto an upper inside of a measuring groove of a pre-crack, and a displacement rod(12) for delivering moving displacement of the upper tip. The lower tip portion comprises a lower tip(21) fixed to a lower side of the measuring groove, and a guide(22) attached onto the lower tip, wherein the lower tip and the guide are provided with a displacement rod through hole(21a) through which the displacement rod is inserted. The guide fixing portion comprises a guide hole(31) through which the guide is inserted, and a guide fixing tool(32) for fixing the guide inserted to the guide hole. The displacement rod fixing portion moves along the upper tip while fixing the displacement rod, so as to provide upward elastic force to the upper tip. The displacement measuring portion measures the moving displacement of the displacement rod fixing portion. |
