Title: Frequency response fuctions of variant GFRP sandwich panel in thermal environment
DOI: https://doi.org/10.15480/882.13597


Authors: Philipp Hüttich [0009-0007-2042-1645], Dieter Krause [0000-0002-1253-1699]


Affiliation: Institute of Product Development and Mechanical Engineering Design, Hamburg University of Technology

Contact: philipp.huettich@tuhh.de


Keywords: sandwich, thermal environment, structural dynamics, experimental testing


Abstract 

The study focuses on examining the influence of temperature on the eigenfrequencies and amplifications of four different GFRP sandwich panels with aramid honeycomb cores. The temperature range considered is -40°C to 120°C, relevant to aerospace applications. The tests demonstrated that temperature variations have a substantial impact on the eigenfrequencies of the panels, particularly showing significant frequency shifts at temperatures below 0°C. This finding contradicts the initial assumptions. Furthermore, the study revealed that amplifications do not consistently peak at room temperature as commonly assumed in aviation certification standards. Instead, the maximum amplification values occur at different temperature ranges, reflecting the unique properties of each panel.

Purpose und Method
The combined interaction between temperature and mechanical behaviour can affect the structural integrity of sandwich panels in aviation. Till today there is a lack of knowledge about the dynamic behaviour of structural components with sandwich construction under temperature fluctuations and corresponding test data. 
Four different sandwich panels in a thermal chamber were excited with a shaker and the resonances were analysed as a function of temperature.



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