Authors: Qian Feng, Shao Ming Dong, Yu Sheng Ding, Qing Zhou, Akira Kohyama
Abstract: Chopped fiber and a hybrid reinforcement of chopped and continuous fibers were used for
fabricating SiC/SiC composites. Under the selected sintering pressure, the composite sintered at lower
temperature (1820°C) had lower density. Increasing temperature to 1850°C, the density of the composite
reached at a higher level. However, pores still existed and mainly distributed in the areas the fibers
accumulated, especially inside of the fiber bundles. Densely sintered matrix still could be found in the
composite sintered at 1820°C, 15 MPa. In the areas with the fibers accumulated, matrix was relatively
weak so that the cracks were easily propagated leading to the delamination during bending test. When
continuous fiber was included into the chopped fiber reinforced composite, a hybrid reinforcing
mechanism was obtained. This kind of composite had obviously improved toughness and strength. On the
fracture surface, the pulled out fibers that were perpendicular to the fracture surface were increased.
1257
Authors: Jian Yong Feng, Jian Chun Zhang, Hua Zhang
Abstract: The oil filter materials are frequently subjected to abrading and all kinds of friction and making the materials suffered from damage,consequently,the property and service life of the filter materials is reduced.So the purpose of this thesis is to research the tensile performance of the automobile oil filter material and according to constant speed tensile test to measure the macro fracture characteristics,tensile property in the process of before and after tensile testing,tensile fracture form and the math expression.Then compared the breaking strength,breaking elongation,elongation at break and breaking work of these ten oil filter materials.Hope that through the study on the tensile performance of the oil filter materials and summarizes the damage mechanism and tensile fracture form,in order to provides a new way to develop the new material.
2393
Authors: Wei Yuan, Yong Tang, Xiao Jun Yang
Abstract: This study provides a series of investigation on the morphological characteristics and related mechanisms of a porous metal-fiber sintered felt (PMFSF). Multi-tooth cutting and high-temperature solid-phase sintering are used to create the PMFSF. Based on both modeling and experimental methods, the results suggest that the produced fiber has rough surface and curled shape due to cutting deformation. The processing parameters and material mechanical property both have significant effects on formation of fiber morphology. Results also reveal that the fibers in a PMFSF is randomly distributed and connected with each other by forming sintering necks. Besides, the influences of sintering parameters are also analyzed in this work.
1102
Authors: Sai Nan Wei, Rui Zhou Li, Li Chen, Ji Ming Yao
Abstract: Electromagnetic parameters and absorbing properties of fiber absorbents (carbon fiber, SiC fiber and polycrystalline iron fiber) were introduced. The influences of the arrangement, thickness and content of the fibers on radar absorbing property were summarized. New development directions of the fiber absorbents were also indicated.
835
Authors: Yong Jing Lee, Shi Lin Yan, Xin Ye, Zhong Jiang Feng
Abstract: Most of the mold-filling simulation theories for RTM were based on Darcy law and combined with mass conservation equation. Considering the unsaturated region in the experiment, the followings have been done in this paper: (1) first, explaining this un-saturated phenomenon as a sink effect, and amending the saturated filling mold by introducing a sink term to the mass constant equation; (2) second, achieving a simple 1d mold’s unsaturated simulation of the filling process through the compiled software pore-flow.
143