Browsing by Author "Ling, Chen"
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- Fracture of Honeycombs Produced by Additive Manufacturing
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä(2022-06-01) Ling, Chen; Nguejio, Josiane; Manno, Riccardo; St-Pierre, Luc; Barbe, Fabrice; Benedetti, IvanoLattice materials, such as honeycombs, are remarkable in their ability to combine high stiffness, strength and toughness at low density. In addition, the recent and pervasive development of additive manufacturing technologies makes it easier to produce these cellular materials and opens new possibilities to improve their properties by implementing small modifications to their microstructure. Such developments open new opportunities towards the design of new classes of architectured materials. For example, recent computational studies have shown that honeycombs with lattice density gradients have a fracture energy under tensile loading up to 50% higher than their uniform counterparts. The aim of this study is to provide experimental evidence for these promising numerical results. To achieve this, single-edge notched tension specimens, with a honeycomb lattice structures, were manufactured by stereolithography using a ductile polymer resin. The performances of three different honeycombs were compared: (i) a uniform sparse lattice, (ii) a uniform dense lattice, and (iii) a gradient lattice with alternating bands of sparse and dense lattices. The results indicated that specimens with a density gradient may achieve a work of fracture per unit volume that is up to 79% higher than that of a uniform lattice. - Interactive Diorama: A Case Study on Virtual Reality Applied to Cultural Heritage
School of Arts, Design and Architecture | Master's thesis(2018) Ling, Chen - Mechanical performance of carbon-glass hybrid composite joints in quasi-static tension and tension-tension fatigue
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä(2020-10) Javaid, Umair; Ling, Chen; Cardiff, PhilipThe ever increasing size of wind turbines has given rise to a need for robust glass to carbon joint designs. This study investigates the effect of different ply layups on the static and fatigue behaviour of hybrid glass/carbon fibre composite joints. Uni-directional carbon fibre prepreg was co-cured to 8H glass prepreg using an overlap to thickness ratio of 20:1, where four joint designs were examined: scarf, interleaving and two forms of double scarf. The joints were tested statically in uniaxial tension and dynamically in tension-tension fatigue. Finite element analysis has been performed to provide insight into stress distributions within each joint. The double scarf joint (with glass on the outside) was found to perform best in fatigue and static tension, while the interleaving joint performed second best in fatigue in static tension but poorest in fatigue. For joint designs that will be used under highly stressed cyclic loading conditions, the current study indicates that static tests alone are a poor indicator of the joint performance and fatigue tests are required.