Test piece for inspection penetrant performance assessment and comparison

摘要

A test panel and process of preparing a test panel for evaluating the performance of inspection penetrants by inducing cracks into a brittle coating. The process utilizes a penetrating tool which has a point which is pressed in a slow measured manner into the back side of the panel which has a brittle coating on the front side to be cracked. The position of the pointed tool is carefully measured in increments of 0.05″ or smaller. The tool is driven to a depth to obtain the desired crack size, depending on the brittle coating's characteristics.