FATIGUE TESTS OF MATERIALS AND STRUCTURES USING MODERN EQUIPMENT
Currently, much attention is paid to improving of resource estimate accuracy created and upgraded structures working in conditions of vibration. To this end, methods of calculations and tests are improving as well as equipment. As part of the development of modern hardware and software for testing, investigations were done for define fatigue properties of materials on the example of aluminum alloy AMg-6 and structures on the example of semirings of indigenous plain bearings of the crankshaft vehicles. To study of characteristics of the fatigue resistance of materials was designed and manufactured equipment, which allows simultaneous testing of up to six flat samples with a large range of variation of cross-sectional dimensions. For testing of structures was designed special equipment that allows testing of two plain bearings at the same time with the ability to study fatigue characteristics of different sizes of samples. Conducted special studies to monitor the loading conditions, the purpose of which is to establish a relationships the movement of the table shaker and the level of stress in the danger zone of the sample. To determine these relationships the stress-strain state of the sample is calculated using the package ANSYS for materials. For bearings, these relationships were obtained experimentally: strain transducers mounted on samples, and conducted a series of calibration experiments under static loading. Fatigue tests were carried out on an electrodynamic shaker LDS V780. The result is fatigue characteristics of flat cantilevered alloy samples AMg-6 under bending, as well as half-rings plain bearings under harmonic loading.