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OALib Journal期刊

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Special Issue “ECO-COMPASS: Ecological and Multifunctional Composites for Application in Aircraft Interior and Secondary Structures”
Konstantinos Tserpes,Xiaosu Yi
Aerospace | An Open Access Journal from MDPI , 2019, DOI: https://doi.org/10.3390/aerospace6020017
Abstract: Note: In lieu of an abstract, this is an excerpt from the first page. Today, composite aircraft structural parts are mainly made of man-made materials, such as carbon and glass fibres and epoxy resin [...] View Full-Tex
THE INTERPHASE MORPHOLOGY OF EPOXY RESINS ON ALUMINIUM SURFACE
聚合物-金属界面相形貌的研究
YI Xiaosu,
益小苏
材料研究学报 , 1989,
Abstract: The orientated fibrous morphological structure of epoxy resinshas been developed on the thin alumina layer as an metal-polymer interphase inthe case of the laminary reinforced materials or the structural adhesive bon-ding.The formation,development and characteristic of this structure dependupon the system,the curing conditions of the polymer and the state of themetal surface.In the mainphase or middle of the layer the epoxy resin formsa globular superstructural morphology.An important failure mechanism of themetal-polymer jointed materials may possibly be the different fracture appear-ance in the polymer layer due to the mechanical shear loads.It has been fo-und that in the interphase the fibrous structure is extended and yielded,butin the mainphase the parallel cracks are produced in 45 degree direction.
Sandwich Structure Composite with Expandable Graphite Filled or Coated: Evaluation of Flame Retardancy and Mechanical Performances  [PDF]
Chenkai Zhu, Jingjing Li, Fanhao Ji, Xiaosu Yi, Chris Rudd, Xiaoling Liu
Open Journal of Safety Science and Technology (OJSST) , 2019, DOI: 10.4236/ojsst.2019.91002
Abstract: Sandwich composites are increasingly used in high-performance application due to their high specific stiffness, strength and thermal insulation. The sandwich composites were developed using honeycomb and carbon fibre reinforced composite face sheet in this study. Expandable graphite (EG) weighting 5 wt% and 10 wt% were filled in honeycomb or coated on face sheet to improve the fireproof performance. The vertical burning test, cone calorimetry test, thermal insulation analysis, scanning electron microscopy and mechanical test were taken into account. With the increase of EG in the sandwich composites, a significant improvement on flame retardancy with better thermal insulation, lower values of peak heat release rate and MAHRE were confirmed for sandwich composite with EG both coated and filled. In addition, the sandwich with EG coated on face sheet presented better fire resistivity and thermal insulation properties when compared to that with EG filled in honeycomb. However, more total smoke release was also observed for EG coated composites due to partial combustion of resin within sufficient heat and oxygen. Furthermore, no significant effect on the mechanical properties of composites was confirmed from both fireproof approaches.
Nonlinear conductive properties and scaling behavior of conductive particle filled high-density polyethylene composites
Qiang Zheng,Lie Shen,Wenchun Li,Yihu Song,Xiaosu Yi
Chinese Science Bulletin , 2005, DOI: 10.1007/BF02897450
Abstract: The blends prepared by incorporation of carbon black (CB) or graphite powder (GP) into high-density polyethylene (HDPE) matrix have been novel and extensively applied polymeric positive temperature coefficient (PTC) composites. A phenomenological model was proposed on the basis of the GEM equation and the dilution effect of filler volume fraction due to the thermal volume expansion of the polymer matrix. Accordingly, the contribution of the thermal expansion of the matrix to the jump-like PTC transition of the composites was quantitatively estimated and a mechanical explanation was given. It was proved that the contribution of the volume expansion to PTC effect decreased for HDPE/CB composites crosslinked through electron-beam irradiation. Furthermore, the influences of the filler content, temperature and crosslinking on the self-heating behavior as well as the nonlinear conduction characteristics at electrical-thermal equilibrium state were examined. Based on the electric-field and initial resistivity dependence of the self-heating temperature and resistance dependence of the critical field, the mechanisms of the self-heating of the polymeric PTC materials were evaluated. The intrinsic relations between macroscopic electrical properties and microscopic percolation network at electrical-thermal equilibrium state were discussed according to the scaling relationship between the self-heating critical parameter and the conductivity of materials.
THE FIBRILLATION AND REINFORCEMENT BEHAVIOR OF IN-SITU COMPOSITES CONTAINING A THERMOTROPIC LIQUID CRYSTALLINE POLYMER
原位复合高分子材料的成纤过程与增强机制
YI Xiaosu,SHEN Lie,
益小苏,沈烈
材料研究学报 , 1996,
Abstract: Based on rheological,morphological andmicro-mechanical examinations, the formation behavior of a thermotropic liquid crystalline polymer as a dispersed phase in a thermoplastic matrix have been studied by using some theoretical models, which have to be only experimentally determined. The fibrillation conditions have been characterized by material and rheological constants such as We-number, viscosity ratio and critical burst time. Then, a relation between the fiber modulus, note the fibers still disperse in a matrix,and the composite modulus has been set up, so the fiber modulus can be quantitatively estimated. For both the fibrillation and the reinforcement, the results show a satisfactory agreement between the theoretical calculations and the experimental determinations. A preliminary idea for the TP / TLCP composite design has been therefore proposed.
Toughness and Hot/Wet Properties of a Novel Modified BMI/Carbon Fiber Composite
Baoyan ZHANG,Xiangbao CHEN,Ping LI,Xiaosu YI,
材料科学技术学报 , 2001,
Abstract: The toughness and hot/wet properties of a novel modified bismaleimide (BMI) 5428/carbon fiber composite was investigated. Results indicate that the prepared BMI/T700 composite owns high toughness, excellent hot/wet properties and mechanical properties. The compression strength after impact (CAl) of 5428/T700 composite is 260 MPa, and the results of hot/wet test show that the long-term service temperature of 5428/T700 composite can maintain at 170°C.
On the Representativeness of the Cohesive Zone Model in the Simulation of the Delamination Problem
Dafei Li,Elena Sitnikova,Jiahu Wei,Shuguang Li,Xiaosu Yi
- , 2019, DOI: https://doi.org/10.3390/jcs3010022
Abstract: Abstract With the development of finite element (FE) codes, numerical modelling of delamination is often considered to be somewhat commonplace in modern engineering. However, the readily available modelling techniques often undermine the truthful understanding of the nature of the problem. In particular, a critical review of the representativeness of the numerical model is often diverted to merely a matter of numerical accuracy. The objective of this paper is to scrutinise the representativeness of cohesive zone modelling (CZM), which is readily available in most of the modern FE codes and is used extensively. By concentrating on obtaining the converged solution for the most basic types of delamination, a wide range of modelling complications are addressed systematically, through which complete clarity is brought to their FE modelling. The representativeness of the obtained predictions, i.e., their ability to reproduce the physical reality of the delamination process, is investigated by conducting a basic verification of the results, where the capability of the model to reproduce its input data in terms of critical energy release rates is assessed. It is revealed that even with converged solutions, input values of the critical energy release rates for the simple cases considered are not reproduced precisely, indicating that representativeness of the CZM for more general applications must not be taken for granted. View Full-Tex
SELF-REINFORCEMENT OF POLYETHYLENE BY CAPILLARY EXTRUSION AND ZONE DRAWING
聚乙烯毛细管挂丝及区域拉伸自增强
YI Xiaosu ZHAO Gaoming LUO Jianhui,
益小苏,赵高明,罗建辉
材料研究学报 , 1993,
Abstract: Through measuring the thermal plastic deformation curve of polyethylene(PE),this paper determined the capillary extrusion temperature range of polyethylene,and measuredthe mechanical properties and heat shrinkage behavior of extruded raw fibres and low tempera-ture zone drawn fibres.Results show as follows.At lower pressure,the technique of capillaryextrusion has little effect on the mechanical properties of raw fibres.And zone drawing cangreatly enhances mechanical properties of raw fibres and results in self reinforcement,but heatshrinkage enlarges obviously.
PREPARATION OF THERMOPLASTIC STARCH AND THEIR MECHANICAL PROPERTIES
热塑性淀粉材料的制备及其性能
YI Xiaosu,SHI Xiaoying,
益小苏,石小英
材料研究学报 , 1995,
Abstract: In order to prepare thermoplastic starches.water and glycerol were used as plasticizers. and their influences on the processability were studied. As a result. aproposed model of the starch molecular transitions during the extrusion was given.The mechanical properties of these materials with different content of the plasticizers were compared.The aggregate structure of these starches before and after the thermoplastic processing was characterized by DSC and polarrized microscope.
RHEOLOGIC STUDIES OF THERMOTROPIC LIQUID CRYSTALLINE POLYMERS AND THEIR BLENDS
热致液晶高分子及其共混物的流变性能
YI Xiaosu,WEI Liansheng,WANG Huimin,
益小苏,韦联生,王惠民
材料研究学报 , 1992,
Abstract: Rheologic studies of thermotropic liquid crystalline polymers(TLCP)KU9221/polycarbonate(PC)and KU 9231/polyether sulfone(PES)blends were carried out byusing an Instron capillary rheometer.The flow curves show that the viscosity of the TLCP ishigher than those of both PC,PES and their blends with TLCP at low shear rate.At high shearrate,such as normal injection rate,however,the viscosity of the blends is significantly reduced.The TLCP phases are dispersed in greater size and in smaller aspect ratio when extruded at lowshear rate.The dispersion is finer and the aspect ratio increases at high shear rate.
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