Abstract A large-scale fatigue testing machine based on the rotating beam method in a four-point bending configuration was designed and built. With device, high-strength metal specimens with 32-mm gauge diameter 100-mm length can be tested at cyclic frequency of up to 48 Hz. In this work, particular attention paid evaluating spatial temporal uniformity loading within large specimen; methods for...

A novel method of reducing the background pressure in a vacuum system used for sampling a molecular beam from a high pressure region is presented. A triple differential pumping stage is constructed with a chopper with rotating skimmer within the first pumping stage, which serves effectively as a valve separating periodically the vacuum system from the ambient environment. The mass spectrometry ...