Abstract
Creation of new types of materials and development of new methods aimed at extending the lifetime of structures are two interconnected approaches to solve the problem of metallic structures fatigue. The paper considers a method for estimating the efficiency of damping implemented in metallic structures by means of energy-intensive materials. The results of comparative calculation are given on the ultimate number of transverse vibration cycles in bridge girders. The calculation uses a linear hypothesis of fatigue-caused damage summation and a model of cyclic material degradation. Notable increase of the vibration decrement for foam-filled metallic structures is predicted, with the lifetime of products lengthening as a result.
Highlights
The problem of extending the lifetime of metallic structures of lifting and transporting machines is most often solved via technological techniques aimed at affecting the surface layer of metals or by means of diminishing variable dynamic loads
The approach is given to estimating the logarithmic decrement for metallic structures filled with an energy-intensive material on the basis of a pre-determined decrement found in literature sources
Large increase of the decrement is predicted when a foam material is used as a light-weighted filler for metallic structures with closed-profile cross-sections
Summary
The problem of extending the lifetime of metallic structures of lifting and transporting machines is most often solved via technological techniques aimed at affecting the surface layer of metals or by means of diminishing variable dynamic loads. The latter method often uses structural damping [1,2,3,4]. In engineering calculations, 0 means the normal stress in a critical section of a beam [8,12] or the von Mises stress [13] The latter is determined in terms of high-cycle fatigue by solving a boundary value problem from the theory of elasticity. The SolidWorks software package provides desired numerical solution using the finite-element method
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