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首页> 外文学位 >Effects of hydrostatic pressure on mechanical behavior of graphite/epoxy composites and thermal behavior of elastomers.
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Effects of hydrostatic pressure on mechanical behavior of graphite/epoxy composites and thermal behavior of elastomers.

机译：静水压力对石墨/环氧树脂复合材料的机械性能和弹性体的热性能的影响。

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摘要

A new temperature controlled high pressure torsion testing apparatus with internal sensors and furnace, that is capable of containing pressures up to 7 kbar and controlling temperature from {dollar}-{dollar}100{dollar}sp{lcub}rm circ{rcub}{dollar}C to 200{dollar}sp{lcub}rm circ{rcub}{dollar}C, was designed and built. The torsional shear stress-strain behavior of various unidirectional, 60% volume fraction, graphite fiber-epoxy composite laminates, viz., (0{dollar}sp{lcub}rm circ{rcub}{dollar}), (90{dollar}sp{lcub}rm circ{rcub}{dollar}), (+45{dollar}sp{lcub}rm circ{rcub}{dollar}) and ({dollar}-{dollar}45{dollar}sp{lcub}rm circ{rcub}{dollar}) composite samples, has been investigated at various hydrostatic pressures. The (0{dollar}sp{lcub}rm circ{rcub}{dollar}) samples were machined from a press-molded, 1/2 inch thick panel. For the other composite samples, hollow circular cylinders were fabricated using mandrel-wrapped technique and also machined into a particular shape of the torsion specimen. All samples were then polished and coated with rubber latex in order to prevent possible penetration of high pressure fluid.; The shear properties that were determined include the in-plane shear modulus, shear yield strength and fracture strength (maximum stress) and the strain to fracture in terms of applied pressure and fiber orientation. These results were then compared with those for unreinforced epoxy resin matrix molded in vacuum oven tested at the same pressure. In all cases, the shear properties increased with increasing pressure but in different rates depending on the fiber orientation. The increase in the strengths and the toughness was manifested in the change in the modes of fracture. Visual and SEM examination were made to study fracture surface morphology and possible mechanisms.; The pressure dependence of the glass transition temperature of two elastomers, 3,3-bis(azidomethyl)oxetane/tetrahydrofuran and Solithane 113 has been determined, employing high-pressure differential thermal analysis (HP-DTA) up to 8.5 kbar. The glasses of the elastomers were named the specific or the general glass depending on how the glasses were formed. The specific glass formed by lowering temperature under a constant pressure. The general glass consists of a series of specific glasses and the {dollar}Tsb g{dollar} for the glass is determined only at the pressures under which glass is formed. The {dollar}Tsb g{dollar} for both glasses increased with increasing pressure. However, the {dollar}Tsb g{dollar} for the specific glass appears to level off at very high pressure while the {dollar}Tsb g{dollar} of general glass increased monotonically.
机译：一种新型的带有内部传感器和熔炉的温度控制高压扭力测试仪，能够承受高达7 kbar的压力，并且可以控制温度{dollar}-{dollar} 100 {dollar} sp {lcub} rm circ {rcub} {并设计并制造了美元级C至200 {dollar} sp {lcub} rm circ {rcub} {dollar} C。各种单向，体积分数为60％的石墨纤维-环氧树脂复合层压板的扭转剪切应力-应变行为，即（0 {dollar} sp {lcub} rm circ {rcub} {dollar}），（90 {dollar} sp {lcub} rm circ {rcub} {dollar}），（+ 45 {dollar} sp {lcub} rm circ {rcub} {dollar}）和（{dollar}-{dollar} 45 {dollar} sp {lcub} rm circ {rcub} {dollar}）复合样品已在各种静水压力下进行了研究。 （0 {dollar} sp {lcub} rm circ {rcub} {dollar}）样品是由1/2英寸厚的模压板加工而成的。对于其他复合样品，使用心轴缠绕技术制造空心圆柱体，并将其加工成特定形状的扭转样品。然后将所有样品抛光并涂上橡胶胶乳，以防止高压流体可能渗入。确定的剪切性能包括面内剪切模量，剪切屈服强度和断裂强度（最大应力），以及在施加压力和纤维取向方面的断裂应变。然后将这些结果与在相同压力下在真空烘箱中模制的未增强环氧树脂基质的结果进行比较。在所有情况下，剪切性能都随压力的增加而增加，但取决于纤维的方向，其剪切速率不同。强度和韧性的增加表现在断裂方式的改变上。目测和SEM检查以研究断裂表面形态和可能的机理。使用高达8.5 kbar的高压差热分析（​​HP-DTA），确定了两种弹性体3,3-双（叠氮基甲基）氧杂环丁烷/四氢呋喃和Solithane 113的玻璃化转变温度与压力的关系。取决于玻璃的形成方式，将弹性体的玻璃命名为特定玻璃或普通玻璃。通过在恒定压力下降低温度而形成的特定玻璃。普通玻璃由一系列特定的玻璃组成，并且仅在形成玻璃的压力下确定玻璃的Tsb g（美元）。两种眼镜的{Tsb gs {gs}}随压力的增加而增加。然而，特定玻璃的{Tsb g {dollar}似乎在非常高的压力下趋于平稳，而普通玻璃的Tsb g {dollar}单调增加。

著录项

  • 作者

    Shin, Euy Sik.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 230 p.
  • 总页数 230
  • 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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