DCPD TESTING

OVERVIEW

Direct current potential drop (DCPD) testing is a widely accepted method of measuring crack growth by applying a current to a specimen and measuring the electric potential across the crack plane. As the crack grows, so does the electric potential. Cortest DCPD grips and fixtures are intended to be used with a pull-through autoclave in a CERT/SSRT or corrosion fatigue load frame. This way, the specimen will be submersed in a corrosive environment while subjected to tensile loads. The grips are electrically isolated so that they do not interfere with the potential measurements. High pressure and high temperature isolated feed through fittings are included with this assembly to provide access to the electrodes while maintaining a high pressure, high temperature seal.