Qunbo Fan
Beijing Institute of Technology
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Featured researches published by Qunbo Fan.
Applied Composite Materials | 2016
Jingbo Zhu; Yangwei Wang; Fuchi Wang; Qunbo Fan
Co-continuous SiC ceramic composites using pure aluminum, epoxy, and polyurethane (PU) as ductile agents were developed. The dynamic mechanical behavior and failure mechanisms were investigated experimentally using the split Hopkinson pressure bar (SHPB) method and computationally by finite element (FE) simulations. The results show that the SiC3D/Al composite has the best overall performance in comparison with SiC3D/epoxy and SiC3D/PU composites. FE simulations are generally consistent with experimental data. These simulations provide valuable help in predicting mechanical strength and in interpreting the experimental results and failure mechanisms. They may be combined with micrographs for fracture characterizations of the composites. We found that interactions between the SiC phase and ductile agents under dynamic compression in the SHPB method are complex, and that interfacial condition is an important parameter that determines the mechanical response of SiC3D composites with a characteristic interlocking structure during dynamic compression. However, the effect of the mechanical properties of ductile agents on dynamic behavior of the composites is a second consideration in the production of the composites.
Materials | 2017
Yu Zhou; Guoju Li; Qunbo Fan; Yangwei Wang; Haiyang Zheng; Lin Tan; Xuan Xu
The penetration of a 30CrMnMo ultra-high molecular weight polyethylene armor by a high-speed fragment was investigated via experiments and simulations. Analysis of the projectile revealed that the nose (of the projectile) is in the non-equilibrium state at the initial stage of penetration, and the low-speed regions undergo plastic deformation. Subsequently, the nose-tail velocities of the projectile were virtually identical and fluctuated together. In addition, the effective combination of the steel plate and polyethylene (PE) laminate resulted in energy absorption by the PE just before the projectile nose impacts the laminate. This early absorption plays a positive role in the ballistic performance of the composite armor. Further analysis of the internal energy and mass loss revealed that the PE laminate absorbs energy via the continuous and stable failure of PE fibers during the initial stages of penetration, and absorbs energy via deformation until complete penetration occurs. The energy absorbed by the laminate accounts for 68% of the total energy absorption, indicating that the laminate plays a major role in energy absorption during the penetration process.
Journal of Wuhan University of Technology-materials Science Edition | 2014
Fuchi Wang; Xu Zhang; Yangwei Wang; Lu Wang; Zhuang Ma; Qunbo Fan
In order to investigate the damage characteristic of ceramic-metal interpenetrating phase composite (IPC) under dynamic loading, uniaxial dynamic compression was performed to characterize the failure of SiC/Al composite with 15% porosity using a modified Split Hopkinson Pressure Bar (SHPB). High speed photography was used to capture the failure procedure and set up the relationship between deformation and real stress. The deformation control technology was used to obtain collected samples in different deformations under dynamic loading. Micro CT technology was utilized to acquire real damage distribution of these specimens. Moreover, SEM was employed in comparing the damage characteristics in IPC. A summary of the available experimental results showed that IPC without lateral confinement formed double cones. The different features compared with ceramic materials without restraint was shown to be the result of the lateral restraint effect provided by metal phase to ceramics skeleton.
Materials | 2017
Xin Liu; Donghui Yu; Qunbo Fan; Ran Shi
The microstructural evolution and underlying mechanism of a new high strength, high toughness near β titanium alloy, β20C, during hot deformation, and heat treatment were studied qualitatively and quantitatively. It was found that dynamic recovery occurs mainly in β phase, while α phase undergoes both a dynamic recovery and continuous incomplete dynamic recrystallization with a fraction of high-angle grain boundaries (≥15°) of 21.1% under hot-rolling. Subsequently, α phase undergoes static recrystallization with an increasing fraction of high-angle grain boundaries (21.1%→60.7%) under annealing, while the grains are equiaxed with refined grain sizes of 1.63 µm observed from the rolling direction (RD) and 1.66 µm observed from the transverse direction (TD). Moreover, the average aspect ratio of the lamellar α phase was 2.44 observed from the RD and 3.12 observed from the TD after hot rolling, but decreased to 2.20 observed from the RD, and 2.53 observed from the TD after annealing. Furthermore, the strict Burgers’ relationship between α and β phases changed after hot-rolling and remains the distortion, even after the static recrystallization process of α phase during annealing.
Journal of Alloys and Compounds | 2016
Ran Shi; Zhihua Nie; Qunbo Fan; Guoju Li
Surface & Coatings Technology | 2013
Lin Lu; Fuchi Wang; Zhuang Ma; Qunbo Fan
Materials & Design | 2015
Linlin Wang; Qunbo Fan; Yanbo Liu; Guoju Li; Hongmei Zhang; Quansheng Wang; Fuchi Wang
Surface & Coatings Technology | 2007
Qunbo Fan; Lu Wang; Fuchi Wang; Quansheng Wang
Finite Elements in Analysis and Design | 2016
Qingxiang Wang; Hongmei Zhang; Hongnian Cai; Qunbo Fan; Xu Zhang
Computational Materials Science | 2016
Qingxiang Wang; Hongmei Zhang; Hongnian Cai; Qunbo Fan; Guoju Li