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- 저자 : Qiyang Wu (검색결과 5 건)
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Yulin Wu,Qianqian Dong,Jian He,Qiyang Chen 대한토목학회 2023 KSCE JOURNAL OF CIVIL ENGINEERING Vol.27 No.3
To investigate the tensile failure phenomenon of rock masses with filled natural defects, the mechanical behavior of 3D printed rock-like materials containing filled kinked fissures under uniaxial tension was identified. Different inclination angles of branch fissure were considered, and cement and gypsum slurry were selected as the infilling materials. It was found that filling materials enhanced the strength of the specimen, which presented to be cement filling > gypsum filling > no filling. The change of inclination angle of branch fissure had significant influence on the strength and failure mode of the specimen and the strength order was -135o> -45o > 90o and +45o > 90o > +135o. Two types of failure pattern, namely tip failure and non-tip failure, were observed in the experiment. Three types of newborn cracks were identified using a high-speed camera. The result achieved by using the digital image correlation technology indicated that different filling conditions led to the position change of high-strain zone. The displacement field of the filled specimen developed from being continuous to being discontinuous. Furthermore, the extended finite element method was adopted to simulate the filled and unfilled specimens, consistent with the experimental results. This study can provide a reliable reference for studying the tensile stress zones in rock exploration.
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Zhen Wang,Qiyang Tan,Pengfei Shi,Ge Yang,Siyu Zhu,Guoshan Xu,Bin Wu,Jianyun Sun 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.3
Hybrid simulation (HS) is a versatile tool for structural performance evaluation under dynamic loads. Although real structural responses are often multiple-directional owing to an eccentric mass/stiffness of the structure and/or excitations not along structural major axes, few HS in this field takes into account structural responses in multiple directions. Multi-directional loading is more challenging than uni-directional loading as there is a nonlinear transformation between actuator and specimen coordinate systems, increasing the difficulty of suppressing loading error. Moreover, redundant actuators may exist in multi-directional hybrid simulations of large-scale structures, which requires the loading strategy to contain ineffective loading of multiple actuators. To address these issues, lately a new strategy was conceived for accurate reproduction of desired displacements in bi-directional hybrid simulations (BHS), which is characterized in two features, i.e., iterative displacement command updating based on the Jacobian matrix considering nonlinear geometric relationships, and force-based control for compensating ineffective forces of redundant actuators. This paper performs performance validation and application of this new mixed loading strategy. In particular, virtual BHS considering linear and nonlinear specimen models, and the diversity of actuator properties were carried out. A validation test was implemented with a steel frame specimen. A real application of this strategy to BHS on a full-scale 2-story frame specimen was performed. Studies showed that this strategy exhibited excellent tracking performance for the measured displacements of the control point and remarkable compensation for ineffective forces of the redundant actuator. This strategy was demonstrated to be capable of accurately and effectively reproducing the desired displacements in large-scale BHS.
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Numerical Simulation of the Coalescence Behavior of Intermittent Structures with Fissures
Qianqian Dong,Yulin Wu,Qiyang Chen 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.4
To further study the failure behavior of the rock-like materials containing intermittent fissures subjected to uniaxial compression, 3D printing technology was adopted to manufacture specimens with prefabricated kinked and straight fissures (K-S fissure). The order of average peak strength was -45o > -90o > +90o > +45o. The influence of different parameters, including the effective length and inclination angle of branch fissure, on the coalescence pattern was discussed. Results showed that two failure modes were observed: Model I represented tensile-shear composite failure in the rock bridge area, while Model II showed non-coalescence occurring. The effective length parameter presented a relatively larger influence than the inclination angle on the failure behavior. Additionally, Model I was discovered to tend to occur in the rock bridge region when the branch fissure turned anticlockwise. Based on numerical simulation using the Realistic Failure Process Analysis (RFPA2D), a quick damage criterion approach was proposed to estimate the coalescence behavior in the rock bridge, which was beneficial to determine coalescence pattern and failure behavior. Based on the curve fitted by the simulation, the coalescence pattern of cracks initiated from pre-existing intermittent fissures occurs in the tensile-shear composite fracture pattern, while non-coalescence occurs in the rock bridge below the curve.
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Honggui Wan,Jianfeng Yuan,Xianyang Shan,Qiyang Wu,Nan Shi 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.4
A gray and low viscosity extracellular polysaccharide (EPS) composed of N-acetylglucosamine, xylose,and mannose was isolated from culture medium of Bacillus sp. strain LBP32 by ethanol precipitation followed by dialysis and freeze-drying. The crude biopolymer showed an apparent molecular weight (Mw) of ~ 9.62 × 10^4. Chemical and spectroscopic studies revealed that the bacterial biopolymer was composed of a β-1,4-linked backbone carrying a low content of β-1,3-linked backbone. In addition, the EPS demonstrated a high antioxidant activity in a concentration dependent manner. The 50%inhibition concentration (IC_(50)) for quenching hydroxyl radical (·OH) and superoxide radical (·O_2^−) were 0.042 and 0.165 mg/mL, respectively. Furthermore, the EPS demonstrated a strong protective effect against lipid peroxidation and radiation such as UV radiation and ion beam irradiation. These results indicate that the protective effects of the EPS were most likely due to its free radical scavenging ability.
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Qi Yang,Yu Zhong,Xiaoming Li,Xin Li,Kun Luo,Xiuqiong Wu,Hongbo Chen,Yang Liu,Guangming Zeng 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
In this study, the bromate removal was investigated in continuous fixed-bed column using Fe(II)–Al(III)layered double hydroxide (LDH). With increase of column bed depth from 1.0 to 3.0 cm, breakpoint time(tb) increased from 51 to 175 h while throughput volume raised from 12.24 to 42.00 L at breakthroughpoint. The bromate removal was attributed to the reduction of Fe(II) present in LDH. The breakthroughcurve was simulated well by Thomas model, but BDST model was the only effective to initial part(1–10%). The maximum removal capacity (N0) calculated by Thomas model reached 71.01 mmol/g atflow rate (3 mL/min).
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