METHOD OF INSPECTING FATIGUE FRACTURE OF FIBER REINFORCED COMPOSITE MATERIAL STRUCTURE

摘要

PURPOSE:To quantitatively inspect the condition of the internal fatigue of the structure from the fluctuation in the electric resistance value of the single metallic wires between measuring terminals by disposing one to plural pieces of single metallic wires to the proper points in the structure in such a manner that both ends serve as measuring terminals. CONSTITUTION:The steel single wire 2 having 0.09mm diameter is embedded to nearly the intermediate position of the thickness of the fatigue test piece 2 formed of glass fiber reinforced polyester and both ends thereof are exposed as the measuring terminals 3, 3. The condition of the internal fatigue of the structure is quantitatively inspected by measuring the fluctuation in the electric resistance between the measuring terminals 3 and 3. The steel single wire 2 which is previously subjected to a film treatment by a silane coupling treatment and urethane primer treatment is used. The internal fatigue of the structure is quantitatively inspected and the fatigue fracture thereof is previously known in this way regardless of its size.