Abstract
Sandwich beams that are composed of laminated face sheets and aluminum pyramidal truss cores are considered to be essential elements of building and aerospace structures. In this paper, a methodology for the experimental and numerical analysis of such structures is presented in order to support their industrial application. The scope of the present research covers both the experimental and numerical extraction of the dynamic parameters of the sandwich beams. Vibration tests are performed while using an optical system for three-dimensional vibrations sensing. The in-plane and out-of-plane vibration modes can thus be examined. A detailed numerical model of the sandwich beam is developed, including an adhesive joint (an additional layer of material) between the parent components of the beam. The numerically predicted modal parameters (eigenfrequencies, mode shapes, modal loss factors) are comported with their corresponding experimentally-obtained values. The modal loss factors are predicted based on the strain energy method, for which a brief theoretical introduction is provided. The obtained experimental and numerical results coincide with good accuracy. The circumstances for possible model simplifications are provided depending on the solution objectives.
Highlights
The numerical modeling of various types of structures has become an indispensable part of engineering design work
The sandwich beams were composed of two parent components: (1) upper and lower face sheets made of laminated carbon fiber reinforced plastic (CFRP); and, (2) a pyramidal truss core made of the aluminum alloy PA6 (Figure 1d)
We propose expressing the modal loss factor of the sandwich beam as a sum of the damping fractions from the individual parent components and adhesive material
Summary
The numerical modeling of various types of structures has become an indispensable part of engineering design work. The problems that are related to the analysis of structures made of metal, timber, or composite materials are often addressed through numerical analyses. Such analyses are useful when a structure becomes increasingly anisotropic, which is often the case with composite structures. There is a large variability of types of composite structures. Numerical tools for analyzing composite structures’ behavior are constantly being developed and improved upon. One type of these structures is a sandwich composite with a pyramidal truss core
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