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<p>To accurately and efficiently calculate the complex and diverse mechanical responses of aerospace engine ceramic matrix composites (CMCs) structures, it is necessary to develop a high-precision and arbitrary loading and unloading constitutive model to describe the mechanical responses of CMCs. Loading and unloading tests of fiber bundle CMCs and 2.5D woven CMCs were carried out in an oxygen-free environment from 25 to 1600°C. The macroscopic and microscopic damage mechanisms of CMCs were investigated, the effect of temperature on the mechanical behavior of CMCs was analyzed, and a fine-scale constitutive model of the fiber bundle CMCs was established by considering the effect of temperature. The stress-strain curves of woven CMCs were calculated based on the 2.5D single-cell model of woven CMCs and the constitutive model of fiber bundle composites was established by XCT technology, and the calculated constitutive curves were in good agreement with the experimental results.</p>

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A Constitutive Modeling Study of Loading and Unloading of 2.5D Woven CMCS Considering the Effect of Temperature

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Tao Wu,
  • ZiXuan Tang,
  • Ruimeng Yang,
  • Zhikang Zheng,
  • Miangzhuo Zhao,
  • Xiguang Gao,
  • Yingdong Song

摘要

To accurately and efficiently calculate the complex and diverse mechanical responses of aerospace engine ceramic matrix composites (CMCs) structures, it is necessary to develop a high-precision and arbitrary loading and unloading constitutive model to describe the mechanical responses of CMCs. Loading and unloading tests of fiber bundle CMCs and 2.5D woven CMCs were carried out in an oxygen-free environment from 25 to 1600°C. The macroscopic and microscopic damage mechanisms of CMCs were investigated, the effect of temperature on the mechanical behavior of CMCs was analyzed, and a fine-scale constitutive model of the fiber bundle CMCs was established by considering the effect of temperature. The stress-strain curves of woven CMCs were calculated based on the 2.5D single-cell model of woven CMCs and the constitutive model of fiber bundle composites was established by XCT technology, and the calculated constitutive curves were in good agreement with the experimental results.