Use of Optical Fibers to Investigate Strength Limit States for Pressure Pipe Liners Spanning across Circular Perforations

Local strain concentrations that develop where cured-in-place pipe liners span across perforations in the wall of the cast iron host pipe have been identified as a key limit state. However, difficulties measuring strain have resulted in minimal experimental support for existing theoretical findings. This paper reports on the use of distributed strain sensing with polyimide optical fibers to quantify strain profiles along the inside surface of a...