Simultaneous sound velocity and thickness measurement by the ultrasonic pitch-catch method for corrosion-layer-forming polymeric materials

摘要

Highlights?One of the degradation behaviors is “corrosion-layer-forming” degradation.?In the degradation type, a corrosion layer remains on a pristine part.?The sound velocity as well as the thickness depends on the degree of corrosion.?We propose an ultrasonic pitch-catch method for simultaneous measurement.?The method can simultaneously measure the thicknesses and the velocities.AbstractSince thermosetting resins have excellent resistance to chemicals, fiber reinforced plastics composed of such resins and reinforcement fibers are widely used as construction materials for equipment in chemical plants. Such equipment is usually used for several decades under severe corrosive conditions so that failure due to degradation may result. One of the degradation behaviors in thermosetting resins under chemical solutions