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Damage of scarf-repaired composite laminates subjected to low-velocity impacts
Xiaoquan Cheng,Wenyi Zhao,Shufeng Liu,Yunyan Xu,Jianwen Bao 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.17 No.2
The damage characters of scarf repaired composite laminates subjected to low-velocity impact with various energy levels at different locations are studied experimentally. The results are compared with those of the original laminates which have no initial damage and don’t need repair. The impact load-time history of the specimens, the velocity-time curves of the impactor, the post impact compressive strength of the specimens and the C-scan photographs of the damaged regions are obtained. The delamination threshold load and damage character of the specimen section at impact point are also studied. The results have shown that the impact response of a repaired composite laminate is sensitive to the location of the impact. The impact load and the delamination threshold load have shown different characters for specimens with different impact locations. The debonding characters of the adhesive and compressive strength after impact of the specimens are also influenced by impact locations.
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Effects of Chlorine Addition to TiO2 Nanorods-Based Perovskite Solar Cells
Dong Zhao,Rendong Wang,Pengfei Wang,Shutao Li,Zhao Li,Meiling Sun,Yunyan Liu,Junshan Xiu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6
Titanium dioxide (TiO2) nanorods (NR) structure and Chlorine substitution is beneficial to the extraction and diffusion of electrons in perovskite solar cells (PSCs). In this work, different concentrations of PbCl2 in perovskite are integrated with TiO2 (NR) to fabricate PSCs. The total thickness of perovskite absorber layer and electron transport layer (ETL) is about 850 nm, and the PSCs exhibit excellent performance. Scanning electron microscope (SEM) and X-ray diffraction (XRD) test reveal that moderate PbCl2 additive improves the perovskite film morphology and crystal quality of perovskite films. Optimal perovskite films with high crystallinity and uniform surface were prepared by adding 3 mol% PbCl2 into perovskite precursor solution, the crystal boundary and defect states are greatly reduced, thus reducing the electrons and holes recombination. The power conversion efficiency (PCE) enhancement of the device with this optimal molar ratio of PbCl2 is over 24% compared with the device without PbCl2.
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