Investigation of Dynamic Characteristics of Nomex Composite Sandwich Plate

Year 2025, Volume: 1 Issue: 1, 1 - 11, 30.06.2025

Murat Şen , Yunus Onur Yıldız , Osman Yiğid , Sertaç Emre Kara

Abstract

This study investigates the dynamic characteristics of Nomex composite sandwich structures, which are widely utilized in extensive engineering fields such as aerospace, marine, and automotive industries due to their numerous advantages, including high strength, vibration and sound insulation, and thermal resistance. Considering that these structures typically operate under dynamic conditions, understanding their dynamic properties, such as resonance frequencies, vibration modes, and damping ratios, is crucial for their efficient and safe operation.
In the presented study, the resonance frequencies, vibration modes, and damping ratios of Nomex composite sandwich plates were determined using the Experimental Modal Analysis (EMA) method. It was observed that the structure exhibited a significant vibration damping ratio at the vibration modes corresponding to its resonance frequencies.

Keywords

Nomex composite sandwich structures , Dynamic analysis , Modal analysis , Resonance frequency , Vibration mode shape , Damping ratio.

Nomex Kompozit Sandviç Plakanın Dinamik Özelliklerinin İncelenmesi

Abstract

Bu çalışma, yüksek mukavemet, titreşim ve ses yalıtımı ve termal direnç gibi sayısız avantajları nedeniyle havacılık, denizcilik ve otomotiv endüstrileri gibi kapsamlı mühendislik alanlarında yaygın olarak kullanılan Nomex kompozit sandviç yapıların dinamik özelliklerini araştırmaktadır. Bu yapıların genellikle dinamik koşullar altında çalıştığı düşünüldüğünde, rezonans frekansları, titreşim modları ve sönümleme oranları gibi dinamik özelliklerini anlamak, verimli ve güvenli çalışmaları için çok önemlidir.
Sunulan çalışmada, Nomex kompozit sandviç plakaların rezonans frekansları, titreşim modları ve sönümleme oranları Deneysel Modal Analiz (EMA) yöntemi kullanılarak belirlenmiştir. Yapının, rezonans frekanslarına karşılık gelen titreşim modlarında önemli bir titreşim sönümleme oranı sergilediği gözlemlenmiştir.

Keywords

Nomex kompozit sandviç yapılar , Dinamik analiz , Modal analiz , Rezonans frekansı , Titreşim mod şekli , Sönüm oranı

References

• A. Karakoç ve J. Freund, “Experimental studies on mechanical properties of cellular structures using Nomex® honeycomb cores”, Composite Structures, vol. 94, no 6, pp. 2017-2024, 2012.
• L. Liu, P. Meng, H. Wang, ve Z. Guan, “The flatwise compressive properties of Nomex honeycomb core with debonding imperfections in the double cell wall”, Composites Part B: Engineering, vol. 76, pp. 122-132, 2015.
• B. Castanié, C. Bouvet, Y. Aminanda, J.-J. Barrau, ve P. Thévenet, “Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins”, International Journal of Impact Engineering, vol. 35, no. 7, pp. 620-634, 2008.
• L. Liu, H. Wang, ve Z. Guan, “Experimental and numerical study on the mechanical response of Nomex honeycomb core under transverse loading”, Composite Structures, vol. 121, pp. 304-314, 2015.
• S. Xie, K. Jing, H. Zhou, ve X. Liu, “Mechanical properties of Nomex honeycomb sandwich panels under dynamic impact”, Composite Structures, vol. 235, no. 111814, 2020.
• H. Zhou, P. Xu, S. Xie, Z. Feng, ve D. Wang, “Mechanical performance and energy absorption properties of structures combining two Nomex honeycombs”, Composite Structures, vol. 185, pp. 524-536, 2018.
• H. Feng, L. Liu, ve Q. Zhao, “Experimental and numerical investigation of the effect of entrapped air on the mechanical response of Nomex honeycomb under flatwise compression”, Composite Structures, vol. 182, pp. 617-627, 2017.
• D. Wang, “Impact behavior and energy absorption of paper honeycomb sandwich panels”, International Journal of Impact Engineering, vol. 36, no. 1, pp. 110-114, 2009.
• Z.-W. Wang, “Mathematical modelling of energy absorption property for paper honeycomb in various ambient humidities”, Materials & Design, vol. 31, no. 9, pp. 4321-4328, 2010.
• M. Giglio, A. Gilioli, ve A. Manes, “Numerical investigation of a three point bending test on sandwich panels with aluminum skins and NomexTM honeycomb core”, Computational Materials Science, vol. 56, pp. 69-78, 2012.
• R. Roy, K. Nguyen, Y. Park, J. Kweon, ve J. Choi, “Testing and modeling of NomexTM honeycomb sandwich Panels with bolt insert”, Composites Part B: Engineering, vol. 56, pp. 762-769, 2014.
• Y.-B. Park, J.-H. Kweon, ve J.-H. Choi, “Failure characteristics of carbon/BMI-Nomex sandwich joints in various hygrothermal conditions”, Composites Part B: Engineering, vol. 60, pp. 213-221, 2014.
• A. Gilioli, C. Sbarufatti, A. Manes, ve M. Giglio, “Compression after impact test (CAI) on NOMEXTM honeycomb sandwich panels with thin aluminum skins”, Composites Part B: Engineering, vol. 67, pp. 313-325, 2014.
• Y. Zhou, Y. Xu, H. Liu, Y. Guo, X. Yi, ve Y. Jia, “Debonding identification of Nomex honeycomb sandwich structures based on the increased vibration amplitude of debonded skin”, Composites Part B: Engineering, vol. 200, no. 108233, 2020.
• Z. Song, S. Luong, D. Whisler, ve H. Kim, “Honeycomb core failure mechanism of CFRP/Nomex sandwich panel under multi-angle impact of hail ice”, International Journal of Impact Engineering, vol. 150, no. 103817, 2021.
• Y. Zhou, A. Liu, Y. Xu, Y. Guo, X. Yi, ve Y. Jia, “Frequency-dependent orthotropic damping properties of Nomex honeycomb composites”, Thin-Walled Structures, vol. 160, no. 107372, 2021.
• G. L.J. ve M. Ashby, “Cellular Solids: Structure and Properties”, New York: Cambridge University Press, pp. 93-174, 1997.
• L. Xia, X. Jin, ve Y. Wang, “The Equivalent Analysis of Honeycomb Sandwich Plates for Satellite Structure 2001, Shanghai Jiaotong University”, Journal of Shanghai Jiaotong University, vol. 37, no. 7, pp. 999-1001, 2003.
• A. Boudjemai, R. Amri, A. Mankour, H. Salem, H. Bouanane, ve B. Boutchicha, “MDA of Hexagonal Honeycomb Plates used for Space Applications, International Journal of Mechanical, Aerospace, Industrial”, Mechatronic and Manufacturing Engineering, vol. 6, no. 6, pp. 1061-1069, 2012.
• A. Boudjemai, R. Amri, A. Mankour, H. Salem, M. Bouanane, ve D. Boutchicha, “Modal analysis and testing of hexagonal honeycomb plates used for satellite structural design”, Materials & Design, vol. 35, pp. 266-275, 2012.