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首页> 外文学位 >A STATISTICAL THEORY OF INTERFACIAL SHEAR STRENGTH DISTRIBUTION, AND ITS APPLICATIONS TO CARBON-FIBER REINFORCED POLYMER COMPOSITES.
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A STATISTICAL THEORY OF INTERFACIAL SHEAR STRENGTH DISTRIBUTION, AND ITS APPLICATIONS TO CARBON-FIBER REINFORCED POLYMER COMPOSITES.

机译：界面剪切强度分布的统计理论及其在碳纤维增强聚合物复合材料中的应用。

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摘要

The objectives of this research are to develop a statistical theory of interfacial shear strength (IFSS), and to apply this theory to diagnose the effect of electrodeposited coatings on carbon fiber on the IFSS in a single filament composite. KR138S, titanium di(dioctyl pyrophosphate) oxyacetate, and P-30 (ammonium polyphosphate), which have been shown to minimize fiber lofting, were selected for electrodeposition and evaluation of their effect on IFSS.; The statistical theory of IFSS was developed by treating both the fiber fracture stress and the ultimate fragmentation length as dependent random variables. The single filament composite technique was used to get the fragmentation length distribution of the carbon fiber embedded in the epoxy matrix. Various models were tried to fit the empirical strength distribution and the empirical fragmentation length distribution. Kolmogorov-Smirnov goodness-of-fit test was used to test the goodness-of-fit of the proposed models.; A bimodal lognormal model fits the gauge-length dependent strength distribution best, and a unimodal lognormal model fits the fragmentation-length distribution best for Fortafil 3 fibers. Furthermore, the interflaw spacing is inferred from a statistical analysis of the fiber strength at different gauge lengths.; From the observed distributions for fiber strength and fragmentation lengths, an analytical solution of the IFSS distribution is obtained as a lognormal distribution. The electrodeposition of KR138S on carbon fiber increases IFSS and interflaw spacing; washing off the protective KR138S coating further increases IFSS, but decreases interflaw spacing. The compatability of the KR138S interlayer with the epoxy matrix, and the significant role of other effects, such as surface oxidation, during electrodeposition are thus indicated.; The theory is not limited to carbon-fiber-epoxy composite, but has general applicability to composites with elastic fibers in a plastic matrix.
机译：这项研究的目的是发展一种界面剪切强度的统计理论，并将该理论用于诊断单丝复合材料中碳纤维上电沉积涂层对IFSS的影响。已选择KR138S，焦磷酸二（二辛基焦磷酸酯）和P-30（聚磷酸铵）来最小化纤维膨松，以进行电沉积和评估其对IFSS的影响。 IFSS的统计理论是通过将纤维断裂应力和最终断裂长度视为因变量而建立的。使用单丝复合技术获得嵌入在环氧树脂基体中的碳纤维的断裂长度分布。尝试了各种模型来拟合经验强度分布和经验碎裂长度分布。 Kolmogorov-Smirnov拟合优度检验用于检验所提出模型的拟合优度。双峰对数正态模型最适合与长度相关的强度分布，而单峰对数正态模型最适合Fortafil 3纤维的断裂长度分布。此外，通过对不同规格长度下纤维强度的统计分析可以推断出间隙间距。从观察到的纤维强度和碎裂长度分布，可以得到对数正态分布的IFSS分布解析解。 KR138S在碳纤维上的电沉积增加了IFSS和缺陷间距。清洗保护性KR138S涂层会进一步增加IFSS，但会减小缺陷间距。因此表明了KR138S中间层与环氧基质的相容性，以及在电沉积过程中其他作用（例如表面氧化）的重要作用。该理论不限于碳纤维-环氧树脂复合材料，而是普遍适用于在塑料基质中具有弹性纤维的复合材料。

著录项

  • 作者

    OWN, SHI-HAU.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1984
  • 页码 279 p.
  • 总页数 279
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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