The Rising Step Load™ Incremental Step Load test (RSL™ ISL) combines the best parts of various testing approaches to produce a meaningful test parameter in the shortest amount of time. RSL™ ISL is similar to a slow strain rate tensile test however, the load is incrementally increased and sustained long enough to detect hydrogen induced cracking. This innovation allows for only one specimen, often Charpy sized, to be used to measure threshold stress, as opposed to the dozens that are required to perform sustained load run-out tests.
"...When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind..."
~Lord Kelvin PLA, vol.1, "Electrical Units of Measurement", 1883-05-03