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- 저자 : Yushi Qi (검색결과 3 건)
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Lili Chen,Yushi Qi,Yanhan Fei,Zhiming Du 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In order to significantly enhance the performance of graphene in metal matrix composites, in situ SiC nanorods were successfullyfabricated to enhance graphene nanoplatelets (GNPs)-reinforced Al2024 composite, which was prepared by powdersemi-solid processing and friction stir processing. The SiC–GNPs dispersed in the Al matrix uniformly, SiC nanorodswere randomly grown on GNPs sheets in any direction, bridging GNPs as well as GNPs and the Al matrix. Meanwhile, theinterfacial bonding was effective. The hybrid reinforcement of SiC and GNPs endowed composites with superior mechanicalproperties and thermal conductivity. The in situ SiC nanorods transfer phonons and reduce phonon scattering effect inthe through-plane direction of GNPs, which conducive to heat transmission. The composite exhibits improved mechanicalproperties, maximum tensile strength and hardness of 589 MPa and 193 HV are obtained, with 1.0 wt% GNPs addition,respectively. The thermal conductivity of composite increases with the content of SiC–GNPs. When the content of SiC–GNPsreaches 1.5 wt%, the composite has significantly enhanced thermal conductivity (224 W m−1 K−1), which is 115% timeshigher than that of Al2024. Moreover, the effects of SiC–GNPs on the properties were discussed.
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Low Velocity Impact Behavior of Aluminum Honeycomb Structures
Yu Shi,Yi-Qi Wang,Ali Md. Afsar,Jung-Il Song,Intaek Lee,Yasuo Ochi 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Impact behavior of Aluminum Honeycomb Composites (AHC) under the impact loading is checked by using an explicit definition of dynamic ductile failure. Applicable testing followed by drop weight test is also investigated in this study. The specimens with 1/2inches cell size are tested by two impactors with the weight of 5.25Kgf and 11.9Kgf respectively. Dynamic nonlinear transient analysis using finite element method is accomplished for nonlinear contact and elastoplastic behavior described in FE model of AHC. Impact behavior of AHC along with different contact points appeared nearly the same in low impact energy, but it was different in high impact energy. At the centered contact point of honeycomb core cell, resistance peak force shows the highest and at the contact on short-edge of the core cell, its resistance shows the lowest. Comparing fracture mode and time history of resistance force with test, real time deformation from FE results gives the fracture process when the crack initiated and propagated to go further penetration from faced sheet to the honeycomb core.
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Durability Test And Crash Analysis Of Automobile Power Seat
Yu Shi,Yi-Qi Wang,Ali Md. Afsar,Jung-Il Song 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
'Turny type power seat' was developed to have disabled person get on and off a vehicle without troubles. At the same time, it is imperative to ensure the safety and stability of the power seat which necessitates various tests and analysis. In this study, the durability test and crash analysis were performed for the power seat. The durability test was performed by applying a load of 100㎏ to simulate the weight of passenger. Crash analysis was carried out by using the LS-DYNA program. The durability lest ensured a longer life cycle of the power seat. Further, the results of crash analysis showed that the distorted deformation was so low that it could not bring the danger for passengers. However, the forward displacement of the seat was much more to cause a large deformation of the hook plate, which was dangerous for passengers. Therefore, further modifications of the power seat should be made to ensure better performance, especially to reduce the forward displacement when the crash happens.
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