Numerical and Experimental Extraction of Dynamic Parameters for Pyramidal Truss Core Sandwich Beams with Laminated...

Area of Science:

• Materials Science
• Mechanical Engineering
• Structural Analysis

Background:

• Sandwich beams with laminated face sheets and aluminum pyramidal truss cores are critical in aerospace and building structures.
• Industrial application requires robust analysis methods for these composite structures.

Purpose of the Study:

• To develop and validate a methodology for the experimental and numerical analysis of sandwich beams.
• To extract and compare dynamic parameters, including vibration modes and modal loss factors.

Main Methods:

• Experimental vibration tests using a 3D optical sensing system to capture in-plane and out-of-plane vibration modes.
• Development of a detailed numerical model incorporating an adhesive layer.
• Prediction of modal loss factors using the strain energy method.

Main Results:

• Experimental and numerical extraction of modal parameters (eigenfrequencies, mode shapes, modal loss factors).
• High accuracy achieved in the comparison between experimental and numerical results.
• Identification of conditions for potential model simplifications.

Conclusions:

• The presented methodology effectively supports the industrial application of sandwich beams.
• Validated numerical models can accurately predict the dynamic behavior of these structures.
• The study provides insights into simplifying models based on specific application needs.