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首頁> 外文學(xué)位 >Analysis and experimental characterization of out-of-plane properties of woven 3-D reinforced composites.
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Analysis and experimental characterization of out-of-plane properties of woven 3-D reinforced composites.

機譯：機織3-D增強復(fù)合材料面外特性的分析和實驗表征。

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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.
機譯：三維（3-D）增強的紡織復(fù)合材料由于其優(yōu)異的抗分層性和平面外性能而成為研究的熱點。許多研究人員已經(jīng)成功地模擬和表征了該材料類別的平面內(nèi)特性。不幸的是，現(xiàn)有機械測試方法的局限性阻止了3-D增強復(fù)合材料面外特性的表征。缺乏對3-D紡織復(fù)合材料平面外性能的了解，限制了此類復(fù)合材料的應(yīng)用和優(yōu)化。本文介紹了為開發(fā)機械測試方法而進行的工作，該方法能夠測量機織3-D復(fù)合材料的面外拉伸，壓縮，剪切和分層性能。對于每種樣品配置，都應(yīng)解決應(yīng)力場均勻性，載荷引入，性能測量精度，應(yīng)變計與晶胞尺寸以及樣品性能和可重復(fù)性的問題。除了開發(fā)測試方法外，這項工作還介紹并分析了幾種不同的3D編織復(fù)合材料的面外機械性能和破壞模式。已成功開發(fā)出測試方法來表征3-D機織材料的面外拉伸，壓縮，剪切和分層阻力。測試樣品有效地用于確定樹脂和纖維性能，織造結(jié)構(gòu)和歸因于RTM處理的經(jīng)編織物絲束變形對幾種3-D編織復(fù)合材料的面外性能的影響。結(jié)果表明，RTM處理產(chǎn)生的絲束變形對平面外彈性和破壞模式有重大影響。經(jīng)編織物的絲束變形被證明可顯著降低3-D編織的面外壓縮強度。同樣，纖維/基體的界面特性被確定為未來改善3-D編織的抗剪切和抗分層性能的關(guān)鍵領(lǐng)域。此外，成功開發(fā)了幾種理論模型來預(yù)測3-D編織材料的平面特性。這些模型為在彈性特性，平面抗壓強度和抗脫層性方面改進3-D編織和3-D編織雜種的設(shè)計和優(yōu)化提供了起點。

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  • 作者

    Hartranft, Dru D.;

  • 作者單位

    University of Delaware.;

  • 授予單位 University of Delaware.;
  • 學(xué)科 Engineering Materials Science.; Textile Technology.
  • 學(xué)位 Ph.D.
  • 年度 1997
  • 頁碼 272 p.
  • 總頁數(shù) 272
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 工程材料學(xué);輕工業(yè)、手工業(yè);
  • 關(guān)鍵詞

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