Direct Shear Test on Annular Specimens
This apparatus is built to a totally innovative design and differs greatly from the traditional units in which shearing stress is measured by means of an arm acting on two proving rings or load cells. Here a strain gauge type torque meter, directly keyed onto the rotational axis, is used. This solution, besides allowing greater precision, also enables the specimen to be positioned more easily.The vertical loading device is operated by compressed air. A precision valve enables load to be selected and maintained constant.The apparatus is also supplied with a pressure transducer and a strain gauge type transducer.