Modal analysis of honeycomb panels and the influence of boundary conditions on the calculation

• Autorzy: Vlach J. , Pomp N.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In this work we investigate the elastic properties of sandwich beams manufactured by using the LF Technology. Design/methodology/approach: The investigation of the behaviour of rectangular shaped sandwich specimens is focused on the modal analysis and the experimental determination of the samples damping properties. Panels are made by unique technique of dry lamination patented by Czech company 5M s.r.o. The Hexagonal cell honeycomb core is made of aluminium as well as the facesheets. The influence of the main directions of anisotropy and the different panel’s thicknesses on the natural frequencies are investigated. Findings: The results of experiments are compared with the theoretical calculations and finite element method(FEM)simulation results. Theories used for the calculations are the First-order shear deformation theory (FSDT) and the Reddy’s third-order shear deformation theory (TSDT). FEM model had mapped mesh with 20-nodes brick elements. Research limitations/implications: The results obtained from FEA were closest to the experimentally measured data, but still with a deviation. The main reason of different results are geometrical irregularities. While FEM model was too much idealistic, the specimens prepared for measurement were not precisely planar. The specimens with small thickness were more twisted and therefore we got bigger error in the measured data and consequently the bigger deviation in results. In the future, we would like to do further measurements to transfer the real specimen geometry with all irregularities to a FEM model and to do new computations. Originality/value: Originality of this work is modal analysis of honeycomb panels and the influence of boundary conditions on the calculation.

Słowa kluczowe

EN

first order shear deformation theory (FSDT); frequency response function (FRF); honeycomb; third order shear deformation theory (TSDT); shear

PL

funkcja odpowiedzi częstotliwościowych (FRF); plaster miodu; ścinanie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2014
• Tom: Vol. 66, nr 2
• Strony: 81--86
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Vlach J.

• VÚTS, a.s., Liberec, Czech Republic

autor

Pomp N.

• VÚTS, a.s., Liberec, Czech Republic

Bibliografia

• [1] 5M s.r.o., LETOXIT Technology, http://www.5m.cz/cz/lf-technology/
• [2] J.M. Berthelot, Composite materials, Mechanical behaviour and structural analysis, New York, Springer, 1999.
• [3] International ASTM D7250/D7250M – 06, Standard practise for determining sandwich beam flexural and shear stiffness, ASTM Standards on disk, Vol. 15.03, 2011.
• [4] L. Yongqiang, Z. Dawei, Free flexural vibration analysis of symmetric rectangular honeycomb panels using the improved Reddy’s third order plate theory, Composite Structures 88 (2009) 33-39.
• [5] H. Kobayashi, K. Matsumura, Wave equations of Reddy plate based on higher-order shear deformable plate theory, Memoirs of the Faculty of Engineering Osaka City University 40 (1999) 37-44.
• [6] S. Miláček, Modální analýza mechanických kmitů, ČVUT, 2001.
• [7] EN ISO 6892-1, Kovové materiály – Zkoušení tahem – část 1: Zkušební metoda za pokojové teploty, 2010.