PIPE RING SPECIMEN TEST PROCEDURE USING DIC METHOD WITH THREE CAMERAS

Abstract

Pipe material propertise test is very important for quality investigate of pipe construction. Many studies that have been conducted are based on use ring shape specimens. Previous research has used weaker pipe materials and larger diameters, which facilitates tool making. This state of the art has led to the development of a new approach to testing pipe rings of larger thicknesses and smaller diameters (e = 6.32mm, DN32) as well as defining a better test procedure. Using DIC cameras (Digital Image Corelation), stress state analysis was performed and deformations on the outer surface and side of the ring (pipe wall) were analyzed. The outer surface of the ring and the thinning of the test tube in the axial direction as well as the elongation of the measuring part of the test tube were recorded with two cameras. With the third camera, the lateral side of the specimen was recorded so that the change in the thickness of the ring as well as the occurrence of bending in the radial plane during the test were analyzed. The test results are based on data on deformation, thickness reduction in the axial and radial directions. The test results enable the assessment of the condition of the pipe material and the assessment of its service life. The use of ring-shaped test tubes facilitates production and provides better results compared to the flattening method.