Evaluating the Delamination Resistance on Metal Sandwich Panel under Four Points Bending Condition S. Abdullah1,∗, M.K. Faidzi2, S.S.K. Singh1, M.F. Abdullah2 1 Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia. 2 Department of Mechanical Engineering, Faculty of Engineering, Universiti Pertahanan Nasional Malaysia, Kem Perdana Sg. Besi, 57000 W.P Kuala Lumpur, Malaysia ∗ hahrum@ukm.edu.my Keywords: Delamination effect, Dimple geometry, Damage, Sandwich Panel, Bonding capability. The purpose of this work is to investigate the delamination effect on the sandwich panel due to the different dimple geometry using four points bending under 50% and 70% of cyclic loading condition. The geometry of core panel with cavity and less dense properties has a significant affect towards the failure mechanism of delamination. The influence of core geometry plays significant roles in contributing the delamination failure. In many engineering applications, sandwich panel were developed to fulfil the certain requirement such as lightness, high bending stiffness, and capability to absorb high energy in order to sustain an optimum performance [1]. Based on the previous studies, the core geometry with cavity and less dense give significant affect in contributing the delamination effect [2]. Therefore, it is vital to understand the mechanism of delamination failure by investigating the relationship between core geometry and the type of loading conditions in order to enhanced the delamination resistance and improved the capability of sandwich panel. The specimens were prepared using high strength steel, AR500 as outer panel and magnesium alloy as core panel, and they have been tested using four points bending setup with 10 Hz frequency under 50% and 70% of constant cyclic loading condition. The delamination effect on the bonding region in crosssectional view were recorded. It has been found that sandwich panel with smaller dimple geometry has significantly improved the delamination resistance by 30% compared to larger dimple geometry. The delamination effect of cross section in vertical direction at the affected region. It indicates that there was a matrix cracking on the bonding region, which led to the significant delamination effects on the sandwich panel for larger dimple geometry. This study revealed the potential of dimple geometry on core surface enhanced the delamination resistance and contributed to the optimum bonding capability especially in the cyclic loading environment. References [1] Song, S., Xiong, C., Zheng, J., Yin, J., Zou, Y., Zhu, X. (2021). Compression, bending, energy absorption properties, and failure modes of composite Kagome honeycomb sandwich structure reinforced by PMI foams. Composite Structures 277: 114611. [2] Zhang, L., Chen, Y., He, R., Bai, X., Zhang, K., Ai, S., Yang, Y., Fang, D. 2020. Bending behavior of lightweight C/SiC pyramidal lattice core sandwich panels. International Journal of Mechanical Sciences 171: 105409. 100
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