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Analysis and experimental characterization of out-of-plane properties of woven 3-D reinforced composites.

机译：机织3-D增强复合材料面外特性的分析和实验表征。

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摘要

Three-dimensional (3-D) reinforced textile composite materials have become an area of intense research due to superior delamination resistance and out-of-plane properties. Numerous investigators have successfully modeled and characterized the in-plane properties of this material class. Unfortunately, limitations in existing mechanical test methods have prevented characterization of the out-of-plane properties of 3-D reinforced composite materials. The lack of knowledge of the out-of-plane properties of 3-D textile composites has limited the application and optimization of this class of composite materials.; This dissertation presents work performed to develop mechanical test methods capable of measuring the out-of-plane tensile, compressive, shear and delamination properties of woven 3-D composites. The issues of stress field uniformity, load introduction, property measurement accuracy, strain gage versus unit-cell size, and specimen performance and repeatability are addressed for each specimen configuration. In addition to test method development, this work presents and analyses the observed out-of-plane mechanical properties and failure modes of several different 3-D woven composite materials.; Test methods were successfully developed to characterize the out-of-plane tensile, compression, shear and delamination resistance for 3-D woven materials. The test specimens were effectively used to determine the effects of resin and fiber properties, weave architecture and warp weaver tow distortion, due to RTM processing, on the out-of-plane properties of several 3-D woven composite materials. Tow distortions from RTM processing were shown to have a significant effect on out-of-plane elastic properties and failure modes. Warp weaver tow distortions were shown to significantly reduce the out-of-plane compression strength of 3-D weaves. Similarly, fiber/matrix interface properties were identified as a crucial area for future improvement of the shear and delamination resistance properties of 3-D weaves. In addition, several theoretical models were successfully developed to predict out-plane properties of 3-D woven materials. These models offer a starting point for improved design and optimization of 3-D weaves and 3-D weave hybrids with respect to elastic properties, out of plane compression strength and delamination resistance.
机译：三维（3-D）增强的纺织复合材料由于其优异的抗分层性和平面外性能而成为研究的热点。许多研究人员已经成功地模拟和表征了该材料类别的平面内特性。不幸的是，现有机械测试方法的局限性阻止了3-D增强复合材料面外特性的表征。缺乏对3-D纺织复合材料平面外性能的了解，限制了此类复合材料的应用和优化。本文介绍了为开发机械测试方法而进行的工作，该方法能够测量机织3-D复合材料的面外拉伸，压缩，剪切和分层性能。对于每种样品配置，都应解决应力场均匀性，载荷引入，性能测量精度，应变计与晶胞尺寸以及样品性能和可重复性的问题。除了开发测试方法外，这项工作还介绍并分析了几种不同的3D编织复合材料的面外机械性能和破坏模式。已成功开发出测试方法来表征3-D机织材料的面外拉伸，压缩，剪切和分层阻力。测试样品有效地用于确定树脂和纤维性能，织造结构和归因于RTM处理的经编织物丝束变形对几种3-D编织复合材料的面外性能的影响。结果表明，RTM处理产生的丝束变形对平面外弹性和破坏模式有重大影响。经编织物的丝束变形被证明可显着降低3-D编织的面外压缩强度。同样，纤维/基体的界面特性被确定为未来改善3-D编织的抗剪切和抗分层性能的关键领域。此外，成功开发了几种理论模型来预测3-D编织材料的平面特性。这些模型为在弹性特性，平面抗压强度和抗脱层性方面改进3-D编织和3-D编织杂种的设计和优化提供了起点。

著录项

  • 作者

    Hartranft, Dru D.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Engineering Materials Science.; Textile Technology.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 272 p.
  • 总页数 272
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;轻工业、手工业;
  • 关键词

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