Manufacture and investigation on the shape memory polymer composite subsidy pipe

In this paper, a process for restoring damaged pipelines based on shape memory polymer composites (SMPC) was introduced, and the corrosion resistance and mechanical properties of SMPC were evaluated. First and foremost, SMPC was used for repairing damaged oil pipelines. Referring to the wet winding method, the subsidy pipe based on SMPC was fabricated by winding in the axial direction of +/- 45 degrees. According to the failure theory of composite material, the minimum wall thickness of the subsidy pipe to withstand the pressure was determined. The effects of fiber content and temperature on the structural stiffness of semi-circular hinges with different ratios of carbon fiber were observed. Radial and axial compression tests were carried out on the subsidy pipe to study the effect of compression times and temperature on the stiffness. Radial compression tests are conducted on the subsidy pipes with different wall thicknesses to determine the effect of wall thickness on the stiffness.