The determination of the stress condition in elements of steel structures with the method of acoustic tensometry
The determination of the stress condition in elements of steel structures with the method of acoustic tensometry is discussed in the paper. The paper examines the establishment of the dependence of the influence of the stress condition on the relative variation in the speed of an acoustic wave applied to the elements of steel beam structures. It was offered to use a new approach to the implementation of acoustic nondestructive testing for the diagnosis of the stress condition of supporting structures of plant facilities. The impact of external conditions on variations in the speed of an acoustic signal was evaluated. Analytical dependence of the effect of the stress condition of the metal on the relative variation in the speed of an acoustic signal for elements of steel beam structures working in bending was derived. The acoustoelastic coupling coefficient for the relative variation in the speed of an acoustic wave from the stress condition of the metal in elements of steel structures have been derived from the experiments. The devised method was implemented using an angular scanning test for shelves and a wall of the element of a steel beam structure. This method allows to determine the actual stress in the elements of beam steel structures of plant facilities without relieving a structure.