A three degree of freedom model of the dynamic mass at the middle of a test sample, resembling a Stockbridge neutraliser, is introduced. This model is used to identify the hereby called equivalent complex cross section flexural stiffness (ECFS) of the beam element which is part of the whole test sample. This ECFS, once identified, gives the effective cross section flexural stiffness of the beam as well as its effective damping, measured as the loss factor of an equivalent viscoelastic beam. The beam element of the test sample may be of any complexity, such as a segment of stranded cable of the ACSR type. These data are important parameters for the design of overhead power transmission lines and other cable structures. A cost function is defined and used in the identification of the ECFS. An experiment, designed to measure the dynamic masses of two test samples, is described. Experimental and identified results are presented and discussed
This article contemplates the construction of diagrams: stress x number
of cycles and strain x number of cycles from the least squares method,
which can be used when you have a set of data and you want to fit a
mathematical function to them, so that the final result is as
representative as possible. The referred diagrams result from the
accomplishment of fatigue tests, which consist of applying cyclic loads
or deformations, generally of a sinusoidal nature, in standardized
specimens in order to determine the life or fatigue resistance of a
given material. A fatigue test requires the following information: part
geometry, type of applied load and material properties. With this
information and an adequate methodology, it becomes possible to obtain
the life expectancy or durability of the component. At the end, a
simplified code developed in Matlab is also available, which allows
performing all the partial calculations involved, as well as providing
the desired equation.
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