Structural damping determination by finite element approach

✍ Scribed by G.D. Gounaris; N.K. Anifantis

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 165 KB
• Volume: 73
• Category: Article
• ISSN: 0045-7949
• DOI: 10.1016/s0045-7949(98)00257-0

✦ Synopsis

An iterative numerical method is described by which the non-linear material damping of a structural member can be evaluated in a simple way. It is shown that the results of a conventional ®nite element approach can be combined with the damping-stress function, which is assumed to be known from experimental data, to obtain the loss factor of a particular structure. For this reason the dynamic stiness concept is utilized in which the imaginary part of the modulus of elasticity is a function of stress range. Since stress amplitude depends also on the amount of damping present in structure, a numerically iterative scheme is developed for the computation of the non-linear structural damping. Independently of the type of intercoupling between stress distribution function and damping-stress function, suitable solutions may be obtained to yield the loss factor of a particular member. This fast converging approach is accurate, stable and may be generalized to evaluate the loss factor for any structure.