Compressive Performance of the PVC Foam Materials used as Sandwich Panel Core

Year 2024, Volume: 39 Issue: 2, 301 - 307, 11.07.2024

Ahmet Çetin Necdet Geren

https://doi.org/10.21605/cukurovaumfd.1513991

Abstract

PVC foam materials are preferred in many engineering applications because of their lightweight nature and strength/weight ratio. They are mainly used as the core material in the middle of sandwich panels with improved flexural rigidity. The mechanical performances of sandwich panels, such as flexural load-deflection, core shear load, core shear failure load, and indentation failure load, directly depend on the mechanical properties of the core material. In this study, compression tests of AIREX C70 PVC foams with three different densities were performed. The elastic modulus and strength results obtained from the compression tests were compared with the mechanical properties provided in the dataset supplied by the material manufacturer. The core yield loads of a concept sandwich panel were then obtained using the compression mechanical properties of the core, which were obtained from datasets and experimental results. When the core yield loads obtained using both data were compared, it was revealed that the load obtained using the dataset data was 23% inaccurate. Thus, the study explained why compression tests are necessary even though the mechanical properties of PVC foam materials are known in the datasheet.

Keywords

AIREX C70 PVC foam, Sandwich panels, Core yield loads, Compression tests

Sandviç Panellerde Çekirdek Malzeme Olarak Kullanılan PVC Köpük Malzemelerin Basınç Yüklerine Karşı Performansı

Abstract

PVC köpük malzemeler, hafiflikleri ve mukavemet/ağırlık oranları nedeniyle birçok mühendislik uygulamasında tercih edilmektedir. Özellikle eğilme rijitliği artırılmış sandviç panellerin ortasında çekirdek malzeme olarak kullanılırlar. Sandviç panellerin eğilme yükü-sapması, çekirdek kesme yükü, çekirdek kesme kırılma yükü ve çentik kırılma yükü gibi mekanik performansları doğrudan çekirdek malzemenin mekanik özelliklerine bağlıdır. Bu çalışmada, üç farklı yoğunluğa sahip AIREX C70 PVC köpüklerin sıkıştırma testleri gerçekleştirilmiştir. Basma testi sonuçlarından elde edilen elastik modül ve mukavemet sonuçları, malzeme tedarikçisi tarafından sağlanan mekanik özellikler veri sayfası verileri ile karşılaştırılmıştır. Daha sonra, konsept bir sandviç panelin çekirdek akma yükleri veri föyündeki ve deneysel sonuçlardaki çekirdeğin basma mekanik özellikleri kullanılarak, elde edilmiştir. Her iki veri ile elde edilen çekirdek akma yükleri karşılaştırıldığında, veri föyündeki verileri ile elde edilen yükün %23 hatalı olduğu ortaya çıkmıştır. Böylece çalışma, PVC köpük malzemelerin mekanik özelliklerinin veri föyünde bilinmesine rağmen basma testlerinin neden gerekli olduğunu açıklamaktadır.

Keywords

AIREX C70 PVC köpük, Sandviç paneller, Çekirdek akma yükleri, Sıkıştırma testleri

References

• 1. Demir, H., Sipahioğlu, M., Balköse, D., Ülkü, S., 2008. Effect of Additives on Flexible PVC Foam Formation. Journal of Materials Processing Technology, 195(1), 144-153.
• 2. Geren, N., Acer, D.C., Uzay, C., Bayramoglu, M., 2021. The Effect of Boron Carbide Additive on the Low-velocity Impact Properties of Low-density foam Core Composite Sandwich Structures. Polymer Composites, 42(4), 2037-2049.
• 3. Colloca, M., Dorogokupets, G., Gupta, N., Porfiri, M., 2012. Mechanical Properties and Failure Mechanisms of Closed-cell PVC Foams. International Journal of Crashworthiness, 17(3), 327-336.
• 4. Yao, H., Pang, Y., Liu, X., Qu, J., 2022. Experimental Study of the Dynamic and Static Compression Mechanical Properties of Closed-Cell PVC Foams. Polymers, 14(17), 3522.
• 5. Al-Shamary, A.K.J., Karakuzu, R., Özdemir, O., 2016. Low-velocity Impact Response of Sandwich Composites with Different Foam Core Configurations. Journal of Sandwich Structures & Materials, 18(6), 754-768.
• 6. Atas, C., Sevim, C., 2010. On the Impact Response of Sandwich Composites with Cores of Balsa Wood and PVC Foam. Composite Structures, 93(1), 40-48.
• 7. Uzay, Ç., Geren, N., 2020. Effect of Stainless-steel Wire Mesh Embedded Into Fibre-reinforced Polymer Facings on Flexural Characteristics of Sandwich Structures. Journal of Reinforced Plastics and Composites, 39(15-16), 613-633.
• 8. Uzay, Ç., 2021. Enhancing the Out-of-Plane Compressive Performance of Lightweight Polymer Foam Core Sandwiches. Sakarya University Journal of Science, 25(6), 1366-1375.
• 9. Funari, M.F., Spadea, S., Lonetti, P., Lourenço, P.B., 2021. On the Elastic and Mixed-mode Fracture Properties of PVC Foam. Theoretical and Applied Fracture Mechanics, 112, 102924.
• 10. Mostafa, A., Shankar, K., Morozov, E.V., 2013. Insight Into the Shear Behaviour of Composite Sandwich Panels with Foam Core. Materials & Design, 50, 92-101.
• 11. Shuaeib, F.M., Soden, P.D., 1997. Indentation Failure of Composite Sandwich Beams. Composites Science and Technology, 57(9), 1249-1259.
• 12. Steeves, C.A., Fleck, N.A., 2004. Collapse Mechanisms of Sandwich Beams with Composite Faces and a Foam Core, Loaded in Three-point Bending. Part I: Analytical Models and Minimum Weight Design. International Journal of Mechanical Sciences, 46(4), 561-583.
• 13. Steeves, C.A., Fleck, N.A., 2004. Collapse Mechanisms of Sandwich Beams with Composite Faces and a Foam Core, Loaded in Three-point Bending. Part II: Experimental Investigation and Numerical Modelling. International Journal of Mechanical Sciences, 46(4), 585-608.
• 14. Uzay, Ç., Geren, N., 2020. Failure Analysis of Low-density Polymer Foam Core Sandwich Structures under Three-point Bending Loading. Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi, 35(1), 49-58.
• 15. Uzay, C., Geren, N., Boztepe, M.H., Bayramoglu, M., 2019. Bending Behavior of Sandwich Structures with Different Fiber Facing Types and Extremely Low-density Foam Cores. 61(3), 220-230.
• 16. International, A., 2016. Standard Test Method for Flatwise Compressive Properties of Sandwich Cores: Designation: C365/C365M - 16.
• 17. Metyx, C., 2020. Core materials Airex C70. https://www.metyx.com/wp-content/uploads/ 2020/10/TDS-AIREX-C70-E-04.2020.pdf. Access date: 07.09.2021.
• 18. Uzay, Ç., Çetin, A., Geren, N., Bayramoğlu, M., Tütüncü, N., (2023). Predicting the Tensile Stiffness and Strength Properties of Plain Woven Carbon Fiber/Epoxy Laminates: A Practical Analytical Approach and Experimental Validations. Mechanics of Advanced Materials and Structures, 31(12), 2619-2634.