215 Estimation of Longitudinal Tensile Strength in Filament Wound Pipe using Notched Specimen

概要

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For the longitudinal tensile strength of filament wound pipes of glass fiber reinforced plastics (GFRP), Japan Industrial Standard K 7033 (JIS K 7033) was established in 1998,where three kinds of test methods (method A, B and C) were recommended for determining the tensile strengths. The objectives of this study were to compare the tensile strengths measured by each test method and to check whether each test results were acceptable or not for the modified test methods. The longitudinal tensile tests were conducted based on the JIS K 7033. For specimen geometry, a strip cut in the longitudinal direction of the pipe was used in method A, method B used a full section of the pipe and method C used a notched rectangular plate cut from a pipe wall section, so that two of the sides were parallel and the other two sides were at right angles to the longitudinal axis of the pipe. It was found that the three tensile strengths often did not agreed with each other within lower winding angles, and method C agreed with method B within higher winding angle. We discussed the accuracy of each test method, which was proposed as the simplified method to obtain the longitudinal tensile strength of the filament wound pipes.