Proceedings of Mechanical Engineering Research Day 2019, pp. 271-272, August 2019 Effect of damage on vibration characteristic of FDM printed lattice structure material Muhamad Syafwan Azmi1, Rainah Ismail1,2,*, Rafidah Hasan1,2, Azma Putra1,2, Muhammad Nasruddin Nurdin1 1) Fakulti Kejuruteraan Mekanikal, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia 2) Centre for Advanced Research on Energy, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia *Corresponding e-mail:
[email protected] Keywords: Lattice structure; vibration analysis; damage ABSTRACT – The aims of this study are to investigate 2. METHODOLOGY the effect of damage extent and damage location on 2.1 Sample Preparation natural frequencies of the BCC lattice bar. The bar Lattice bar samples with dimension of 160mm x samples were fabricated by using fused deposition 30mm x 15mm size were made by using the FDM AM. modeling (FDM) additive manufacturing (AM) The strut diameter of the BCC lattice bars was kept at 1.8 technique. The damage is represented by missing lattice mm with standard print quality mode combination [4]. unit cells within the structure. Findings show that natural The damage extent is represented by using a damage frequency values decrease with the increase of damage parameter η. extents. Meanwhile, the natural frequency values η = 푛 (1) 푁 increase as the damage location became farther from the Where n is the number of missing unit cells and N is total clamped edge. This research provides good information unit cells of the intact lattice bar sample. For damage on the influence of damage existence to the natural extent study, different damage parameters ranging from frequency values of the lattice structure.