Showing papers by "Shanyi Du published in 2015"
TL;DR: In this paper, a self-stretchable carbon nanotube (CNT) yarn supercapacitor utilizing the helical loop structure incorporated into the CNT yarns is presented.
97 citations
TL;DR: In this paper, the structural evolution of the sol-gel derived SiOC ceramics at high temperatures was investigated using SEM, TG, FTIR, XRD and Raman spectra.
43 citations
34 citations
TL;DR: In this article, the authors investigated the feasibility of exploiting the nonlinear oscillations around the second vibration mode of a rectangular piezoelectric bistable laminate (RPBL), for broadband vibration energy harvesting at relative higher frequencies, but with relative low excitation acceleration.
Abstract: Recently bistable composite laminates have been investigated for broadband energy harvesting, by taking advantage of their nonlinear oscillations around the first vibration mode. However, it has been reported that the excitation acceleration needed for the desired large amplitude limit cycle oscillation is too high, if the first vibration mode is elevated to relative higher frequencies (60 Hz e.g.). This study investigates the feasibility of exploiting the nonlinear oscillations around the second vibration mode of a rectangular piezoelectric bistable laminate (RPBL), for broadband vibration energy harvesting at relative higher frequencies, but with relative low excitation acceleration. The proposed RPBL has three oscillation patterns around the second vibration mode, including single-well oscillation, chaotic intermittency oscillation and limit cycle oscillation. The broadband characteristics and the considerable energy conversion efficiency of the RPBL are demonstrated in experiments. The static nonlinearity and the dynamic responses of the RPBL are investigated by finite element method. Finite element analysis (FEA) reveals that the enhanced dynamic responses of the RPBL are due to its softening bending stiffness and the local snap through phenomenon. The FEA results coincide reasonably well with experimental results.
25 citations
TL;DR: In this article, the effects of boron incorporation on the precursor architecture, microstructure and crystallization of SiBOC ceramics were discussed and the experimental results showed that the incorporation of Boron had little effect on the silicon bonding environment and led to a higher ceramic yield of 89%.
15 citations
TL;DR: In this article, the concept of morphing bi-stable glass fiber-reinforced polymer laminates using electrothermal alloys to trigger the snap-through from one stable configuration to another is presented.
Abstract: This article develops and proves the concept of morphing bi-stable glass fiber–reinforced polymer laminates using electrothermal alloys to trigger the snap-through from one stable configuration to another. The presented concept considers an alternative to existing morphing bi-stable concepts wherein actuators are used to elastically actuate bi-stable laminates to snap between stable configurations. These existing concepts are restricted to some bi-stable laminates with certain layups and sizes. For the concept discussed here, the electrothermal alloys are embedded in the laminates and are used as internal heating sources. Morphing can be achieved by heating and subsequently cooling the local region of the laminate, and no energy is needed to maintain the deformation. One-way and a two-way morphing bi-stable laminates are designed and manufactured. The finite element simulation is performed to predict the thermally induced morphing process. The experimental morphing process is compared with the simulated p...
9 citations