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Morphing high-temperature composite plates utilizing thermal gradients

机译:利用热梯度使高温复合板变形

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摘要

Composite morphing structures often rely on thermal loading to achieve multistability, however new understanding of these structures may enable their use as temperature-driven actuators. An analytical model is presented which predicts the shapes of multistable laminated plates subjected to thermal loads while accounting for thermal gradients and temperature-dependent material properties. Solutions are obtained using Ritz minimization techniques with constant curvature shape functions. Thermal gradients are modeled by specifying temperature as a field variable whose terms are subsequently integrated within the potential energy formulation. The temperature field is also used to determine lamina material properties via interpolation functions operating on material data. Results are given for the case of a [0_2/90_2] carbon/polyimide square plate subject to linear through-thickness temperature variation. An additional class of bistable, obliquely oriented cylinders exists for sufficiently large through-thickness thermal gradients. These cylinders are oriented at ±45° to the plate axes when loading is by thermal gradient alone, and rotate back to the conventionally reported 0° and 90° orientations as uniform temperature change is superimposed upon the thermal gradient. The effect of temperature-dependent material properties was successfully captured over large temperature ranges.
机译:复合变形结构通常依靠热负荷来实现多重稳定性,但是对这些结构的新认识可能使它们能够用作温度驱动的致动器。提出了一种分析模型,该模型预测了承受热负荷的多稳态层压板的形状,同时考虑了热梯度和与温度有关的材料特性。使用具有恒定曲率形状函数的Ritz最小化技术可获得解。通过将温度指定为场变量来对热梯度进行建模,然后将其项整合到势能公式中。温度场还可以通过对材料数据进行插值的函数来确定层材料的特性。给出了[0_2 / 90_2]碳/聚酰亚胺方板受线性贯穿厚度温度变化影响的结果。存在另一类双稳态,倾斜定向的圆柱体,用于足够大的贯穿厚度的热梯度。当仅通过热梯度加载时,这些圆柱体就以与板轴成±45°的方向取向,并且由于均匀的温度变化叠加在热梯度上,因此旋转回常规报道的0°和90°取向。在大温度范围内成功捕获了随温度变化的材料特性的影响。

著录项

  • 来源
    《Composite Structures》 |2013年第6期|363-372|共10页
  • 作者单位

    Advanced Composites Centre for Innovation and Science, University of Bristol, Queen's Building, University Walk, Bristol BS8 1TR, UK;

    Advanced Composites Centre for Innovation and Science, University of Bristol, Queen's Building, University Walk, Bristol BS8 1TR, UK;

    Advanced Composites Centre for Innovation and Science, University of Bristol, Queen's Building, University Walk, Bristol BS8 1TR, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bistability; multistability; morphing; high temperature; temperature dependent material properties; thermal gradients;

    机译:双稳性;多重稳定性;形变;高温;随温度变化的材料特性;热梯度;

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