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á à Á À é è É È ç Ç ê
Ä Ö Ü ä ö ü ß
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      • KCI등재

        Study of the Effectiveness of the RVEs for Random Short Fiber Reinforced Elastomer Composites

        Lili Chen,Boqin Gu,Jianfeng Zhou,Jiahui Tao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7

        The effectiveness of the representative volume elements (RVEs) established by a modified random sequentialadsorption method for random short fiber reinforced elastomer composites (SFECs) was studied. The RVE is considered tobe effective when the RVE’s fiber orientation is isotropic. And the effectiveness of the RVEs was verified by evaluating themechanical properties in different loading directions based on the finite element method. The results show that the fibernumber N=4000 can be regarded as a steady threshold for the isotropy of the fiber orientation in RVEs with various fiberaspect ratios and dilute volume fraction.

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        Fatigue Behavior of Aramid Fiber Reinforced Rubber Matrix Sealing Composites

        Xiaoming Yu,Bin Zhang,Boqin Gu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

        This paper presents an experimental and theoretical study of aramid fiber reinforced rubber sealing composites(AFRC). The fatigue performance of AFRC with different stress amplitudes and fiber mass fractions was tested, and theresidual strength of AFRC after different fatigue cycles was conducted. The fracture morphology of AFRC samples withdifferent fiber mass fractions, stress amplitudes and fatigue cycles were observed by scanning electron microscope (SEM),and the fatigue damage modes of AFRC were discussed. The experimental results were analyzed and predicted by fatigue lifemodel, residual stiffness model and residual strength model. It was found that the results predicted by theoretical modelagreed well with that measured by experimental results, which indicated that the proposed model gave an advantage inevaluating the fatigue behavior of AFRC without further morphological experiments.

      • KCI등재

        Creep and Stress Relaxation Performance of Rubber Matrix Sealing Composites after Fatigue Loading

        Xiaoming Yu,Bin Zhang,Boqin Gu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.2

        The most common working condition in the static seal connection system is load fluctuation. The failuremechanism of sealing material caused by load fluctuation is more complicated than that under static load. This work developsan experimental method to research mechanical property of short fiber reinforced rubber matrix sealing composites (SFRC). The damage behavior of creep and stress relaxation after different fatigue cycles is obtained. The microscopic defects areobserved and analyzed by scanning electron microscope (SEM). The effects of different fatigue cycles on the damage ofmaterials are found, and the damage modes of SFRC are determined. Based on macroscopic phenomena and microscopicmechanism, the parameters of new creep and stress relaxation models of SFRC after different fatigue cycles are determined,respectively. It can be found that the phenomenological model can well characterize fatigue behavior of SFRC.

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