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首页> 外文期刊>Materials Science and Engineering >Effect of interface type on the static and dynamic mechanical properties of 3D braided SiCf/SiC composites
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Effect of interface type on the static and dynamic mechanical properties of 3D braided SiCf/SiC composites

机译：界面类型对3D编织SiCf / SiC复合材料静态和动态力学性能的影响

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摘要

The static and dynamic mechanical properties of three dimensional (3D) braided SiCf/SiC composites with pycrocarbon (PyC) and SiC and without an interphase layer prepared by polymer infiltration and pyrolysis (PIP), were investigated using static and dynamic bending tests as well as microstructural characterization. Test results indicated that the interfacial shear stress, flexural strength, elastic modulus, and storage modulus of 3D braided SiC_f/SiC composites with an interphase layer were superior to those the composites without an interlayer; the former also showed a lower internal friction than the latter. Results from Weibull statistical analysis also indicated that the scale parameter σ_0(337.1 MPa and 630.6 MPa, respectively) and Weibull modulus m (16.85 and 19.91, respectively) of 3D braided SiCf/SiC composites with SiC and PyC interphase were higher than those of composites without an interphase (103.2 MPa, 14.02). The composite with the PyC interphase presented the highest flexural strength and the most ductile fractures because it featured relatively ideal interfacial bonding and a layered interphase structure, leading to effective energy-dissipation mechanisms, such as fiber pull-out. The composite with the SiC interphase exhibited highest elastic and dynamic moduli because of strong interfacial bonding and a non-layered rough interphase structure, which enhanced its ability to resist strain. The ideal interface improves load transfer and did not contribute to damping. The occurrence of interfacial damping in the 3D braided SiC_f/SiC caused the internal friction to become more sensitive to temperature, frequency and amplitude. The static and dynamic mechanical properties, including internal friction and storage modulus, as well as failure behavior of the 3D braided composites were remarkably affected by the interface type.
机译：使用静态和动态弯曲试验以及具有弯曲渗透性（PIP）制备的不带有中间相层的三维碳纤维（PyC）和SiC的三维（3D）编织SiCf / SiC复合材料的静态和动态力学性能进行了研究，以及微观结构表征。试验结果表明，具有相间层的3D编织SiC_f / SiC复合材料的界面剪切应力，弯曲强度，弹性模量和储能模量均优于无中间层的复合材料。前者的内部摩擦也比后者低。 Weibull统计分析的结果还表明，具有SiC和PyC界面的3D编织SiCf / SiC复合材料的尺度参数σ_0（分别为337.1 MPa和630.6 MPa）和Weibull模数m（分别为16.85和19.91）高于复合材料。没有中间相（103.2 MPa，14.02）。具有PyC界面相的复合材料表现出最高的抗弯强度和最易延展的断裂，因为它具有相对理想的界面结合和分层的界面结构，从而导致了有效的耗能机制，例如纤维拉出。具有SiC界面相的复合材料表现出最高的弹性和动态模量，这归因于牢固的界面键合和无层的粗糙相界面结构，从而增强了其抗应变能力。理想的界面可以改善负载传递，并且不会增加阻尼。 3D编织SiC_f / SiC中界面阻尼的出现导致内部摩擦对温度，频率和振幅变得更加敏感。界面类型显着影响3D编织复合材料的静态和动态力学性能（包括内部摩擦和储能模量）以及破坏行为。

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  • 来源
    《Materials Science and Engineering》 |2016年第4期|66-74|共9页
  • 作者

    Zhenhua Hou; Ruiying Luo; Wei Yang; Huaizhe Xu; Tao Han;

  • 作者单位

    School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;

    School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;

    School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;

    School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;

    School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;

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  • 正文语种 eng
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  • 关键词

    Composites; Weibull; Mechanical properties; Internal friction;

    机译：复合材料;威布尔;机械性能内摩擦;

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