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Benchmark solution for degradation of elastic properties due to transverse matrix cracking in laminated composites

机译：层压复合材料中由于横向基体开裂而导致的弹性性能下降的基准解决方案

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摘要

Degradation of laminate moduli and laminate coefficients of thermal expansion, as well as degradation of the cracked lamina moduli and lamina coefficients of thermal expansion, are predicted as a function of crack density for laminated composites with intralaminar matrix cracks. The methodology assumes linear elastic behavior and periodicity of the transverse cracks. The representative volume element is dis-cretized into finite elements. Stress free conditions on the crack surfaces are enforced. Periodic boundary conditions are applied so that any state of applied far-field strain can be simulated. An averaging procedure is used to yield the average stress field. Three uniaxial states of strain and a null state of strain coupled with a unit increment of temperature are used to obtain the degraded stiffness and coefficients of thermal expansion. Results are presented for a number of laminates and materials systems that are customarily used in the literature for experimentation. The modeling approach and results can be used to assess the quality of approximate models. Comparisons are presented to the predictions of one such model and to experimental data. Also, comparisons are presented to classical lamination theory for asymptotic values of crack density.
机译：对于具有层状内部裂纹的层状复合材料，预测了层状模量和层合热膨胀系数的降低，以及开裂的层状模量和层状热膨胀系数的降低，是裂纹密度的函数。该方法假设线性弹性行为和横向裂纹的周期性。代表性体积元素被离散为有限元素。在裂纹表面上施加无应力条件。应用周期性边界条件，以便可以模拟所施加的远场应变的任何状态。平均过程用于产生平均应力场。应变的三个单轴状态和零应变状态与温度单位增量相结合，可用来获得刚度​​和热膨胀系数的降低。给出了许多层压板和材料系统的结果，这些层压板和材料系统通常在实验文献中使用。建模方法和结果可用于评估近似模型的质量。比较表明了一种这样的模型的预测和实验数据。此外，比较了经典层压理论的裂纹密度的渐近值。

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  • 来源
    《Composite Structures》 |2013年第4期|242-252|共11页
  • 作者

    E.J. Barbero; F.A. Cosso; F.A. Campo;

  • 作者单位

    Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506-6106, USA;

    Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506-6106, USA;

    Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506-6106, USA;

  • 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

    toughness; intralaminar; damage; periodicity; thermal expansion;

    机译：韧性;层内损伤;周期性;热膨胀;

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