Dynamic characterisation of cellular cores and sandwich beams

O'Leary, Haydn (2012) Dynamic characterisation of cellular cores and sandwich beams. [USQ Project]

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Abstract

If the use of sandwich panels in the construction industry is going to continue to increase, it is essential that a low-cost and efficient method of material characterisation is established. This project has investigated using vibration tests to perform dynamic characterisation of sandwich panels and cellular cores. This has involved attempting to identify the natural frequency of the material in order to use the Euler equation for beams to calculate the modulus of elasticity.

The modulus of elasticity and shear modulus have been determined using the four point bending test, in order to compare these with the values calculated from the vibration tests. The values for the modulus of elasticity calculated using the identified natural frequencies are not the values which were expected for the material. These calculated values are considerably less than the expected values which suggest there has been an error in the experimentation.

This error is thought to be caused by the weight of the accelerometer and the attached chord having a large influence on the natural frequency of the system. The modulus of elasticity has been successfully determined for the steel samples which have been used as a benchmark, however these are considerably heavier than the sandwich panels which means the weight of the accelerometer has little effect.

With this in mind it has been found that this experiment using the accelerometer used is not suitable for the dynamic characterisation of sandwich panels and cellular core. Investigation is required to determine if this test can be used for dynamic characterisation of sandwich panels and cellular cores if a non-contact measuring technique, such as a laser vibrometer is used.


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Item Type: USQ Project
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Supervisors: Banerjee, Sourish
Date Deposited: 22 Jan 2014 00:22
Last Modified: 22 Jan 2014 00:22
Uncontrolled Keywords: cellular cores; sandwich beams; construction; vibration tests;
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
URI: http://eprints.usq.edu.au/id/eprint/23903

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