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首页> 外文学位 >Axisymmetric finite element modeling of adhesive joint between a laminated composite and metal cylinder.
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Axisymmetric finite element modeling of adhesive joint between a laminated composite and metal cylinder.

机译：叠层复合材料与金属圆柱体之间胶粘接头的轴对称有限元建模。

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摘要

In order to incorporate fiber-reinforced composite materials in space structures, adhesive joining techniques are required. Because analytical models have a hard time capturing the complex stress state inherent to adhesively joining dissimilar materials, a different modeling technique was deemed necessary. A two-dimensional axisymmetric finite element model capable of capturing the three-dimensional stress state of cylindrical adhesive joints was developed. In order to rigorously validate the model, testing was undergone to ensure the model accurately predicted joint displacements.;Displacement data was acquired via an Epsilon axial extensometer. Load data was taken simultaneously via the load cell incorporated in the Tinius Olsen tensile test machine used. The measured force vs. displacement data was found to agree with the model's predicted displacement for a given load. Displacement data was also taken, again with the extensometer, as the joints were rapidly cooled to liquid nitrogen temperature. It was found that the joints behave much like laminated plates in that after the first several cycles they "settle down". The term "settle down", in this context, means that after the first several cycles the displacements of the joints when placed from a room temperature environment to a cryogenic environment become consistent and smooth. This result allows for the joints to be modeled. The finite element model was shown to accurately predict the settled down displacement given the prescribed temperature change.;The joints were also shown to maintain structural integrity post thermal cycling. Transient temperature tensile tests were performed until sample failure. One result with major design implication coming from this test was that the material properties do not change significantly enough over the temperature range tested to affect the joint's behavior. The same properties used in the room temperature model were used to model the measured data of the transient temperature data and were found to match satisfactorily.;Having validated that the developed axisymmetric finite element model accurately predicts cylindrical joint displacement fields, the model becomes an invaluable tool in design. The model can now be used in confidence, in conjunction with design requirements for a specific joint, to reduce the maximum displacements below any specified operating requirements.
机译：为了将纤维增强的复合材料结合到空间结构中，需要粘合剂连接技术。由于分析模型很难捕获粘合不同材料固有的复杂应力状态，因此认为有必要采用其他建模技术。建立了能够捕获圆柱状胶粘接头三维应力状态的二维轴对称有限元模型。为了严格验证模型，进行了测试以确保模型准确预测关节位移。;通过Epsilon轴向引伸计获取位移数据。通过内置在所使用的Tinius Olsen拉伸试验机中的称重传感器同时获取载荷数据。发现测得的力与位移数据与给定负载下模型的预测位移相符。再次使用引伸计获取位移数据，因为接头迅速冷却至液氮温度。结果发现，接头的行为很像层压板，因为在最初的几个循环之后，它们“沉降”了下来。在本文中，术语“沉降”是指在前几个循环之后，从室温环境到低温环境放置时，接头的位移变得一致且平滑。此结果允许对关节进行建模。给出了有限元模型，可以在给定温度变化的情况下准确地预测沉降位移。此外，还显示了节点在热循环后保持结构完整性。进行瞬态温度拉伸试验直到样品失效。该测试的主要设计含义是，在所测试的温度范围内，材料性能变化不明显，不会影响接头的性能。室温模型中使用的相同属性用于对瞬态温度数据的测量数据进行建模，并发现令人满意的匹配。；已经验证了所开发的轴对称有限元模型能够准确预测圆柱关节位移场，该模型成为了无价之宝。设计工具。现在，可以结合特定接头的设计要求放心使用该模型，以将最大位移减小到任何指定的运行要求以下。

著录项

  • 作者

    Talbot, Casey A.;

  • 作者单位

    Utah State University.;

  • 授予单位 Utah State University.;
  • 学科 Engineering Aerospace.;Engineering Mechanical.
  • 学位 M.S.
  • 年度 2011
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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