Design, modeling and structural analysis of single-turn composite wave springs

In this study, the mechanical behavior of single-turn composite wave springs under compressive loads were investigated numerically. Numerical verification of the finite element (FE) model was carried out by comparing the numerical results against analytical calculations. After verification, the FE model was extended to this study. As spring material, carbon fiber/epoxy and E-glass fiber/epoxy were selected. As design parameters, the number of waves (4, 6 and 8) and the thickness of the wave spring (number of plies; 4, 6, 8, 10 and 12) were considered. The stiffness of the composite wave springs was determined by varying these design parameters and material types. The composite spring stiffness values were compared with those made of steel. The failure loads of the wave springs were determined by using Tsai-Wu failure criteria. Additionally, the hybridization effect on the mechanical response of wave springs was investigated. The numerical results showed that it was possible to obtain stiffness values which is comparable with that of steel spring and significant reduction in spring weight if the composite design parameters were selected properly.

Tek-katlý kompozit dalgalý yaylarýn tasarýmý, modellenmesi ve yapýsal analizi

Bu çalýþmada, tek-katlý kompozit dalgalý yaylarýn basý yükü altýndaki mekanik davranýþlarý nümerik olarak incelenmiþtir. Nümerik analizler, Ansys Workbench ve ACP Modülü sonlu elemanlar programý kullanýlarak yapýlmýþtýr. Nümerik doðrulama çelik dalgalý yay probleminin nümerik sonuçlarý ile analitik sonuçlar karþýlaþtýrýlarak yapýlmýþtýr. Doðrulamadan sonra, sonlu elemanlar modeli bu çalýþma için geniþletilmiþtir. Kompozit malzeme olarak karbon fiber/epoksi ve cam fiber/epoksi seçilmiþtir. Tasarým parametreleri olarak dalga sayýsý (4, 6 ve 8) ve kompozit kalýnlýðý (tabaka sayýsý; 4, 6, 8, 10 ve 12) ele alýnmýþtýr. Bu tasarým parametreleri ve malzeme türleri için yay rijitlikleri hesaplanmýþ ve çelik yay ile kýyaslamalar yapýlmýþtýr. Yaylarýn hasar yükleri, Tsai-Wu hasar kriteri kullanýlarak belirlenmiþtir. Buna ek olarak, hibritleþtirme etkisinin yayýn mekanik davranýþa etkisi incelenmiþtir. Nümerik sonuçlar, kompozit tasarým parametreleri doðru olarak seçildiðinde çeliðe yakýn rijitlik deðerlerinin ve yayda önemli aðýrlýk azaltýmýnýn saðlanabileceðini göstermiþtir.