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Digital Radiographic Assay of GFRP Pipe Laminated Joints

The use of composite materials made technological advances possible in biomedical and industrial areas. Polymeric matrices reinforced by glass fiber are the most common among the composite materials used for pipe manufacturing. However, they may present intrinsic issues due to important factors, such as nonuniformity and nonconformities related to reinforcement and matrix. Visual inspections can identify the characteristic fiber distortion discontinuities, surface bubbles, and dry areas of impregnation. To detect porosity, cracking, or delamination, other methods are required. This paper presents the technique of digital radiography for the inspection of composite materials. An amorphous silicon (a-Si) type flat panel detector, a constant potential X-ray source, and a software-controlled rotation table were used. Radiographs of two laminated joints of 4 in. (101.6 mm) glass fiber reinforced polymer (GFRP) pipes were performed. As a result, delamination, debonding, cracking, and porosity discontinuities were detected, which could not be detected visually.

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