| Damage characteristics and constitutive modeling of the 2D C/Si C composite: Part I – Experiment and analysis |
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| 作者姓名： | Li Jun Jiao Guiqiong Wang Bo Yang Chengpeng Wang Gang |
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| 作者单位： | Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an 710129, China |
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| 基金项目： | the National Key Laboratory of Thermostructure Composite Materials for providing the specimens and the financial support from the Basic Research Foundation of Northwestern Polytechnical University of China （No. JC20110219） |
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| 摘 要： | This paper reports an experimental investigation on the macroscopic mechanical behaviors and damage mechanisms of the plain-woven(2D) C/Si C composite under in-plane on- and offaxis loading conditions. Specimens with 15, 30, and 45 off-axis angles were prepared and tested under monotonic and incremental cyclic tension and compression loads. The obtained results were compared with those of uniaxial tension, compression, and shear specimens. The relationships between the damage modes and the stress state were analyzed based on scanning electronic microscopy(SEM) observations and acoustic emission(AE) data. The test results reveal the remarkable axial anisotropy and unilateral behavior of the material. The off-axis tension test results show that the material is fiber-dominant and the evolution rate of damage and inelastic strain is accelerated under the corresponding combined biaxial tension and shear loads. Due to the damage impediment effect of compression stress, compression specimens show higher mechanical properties and lower damage evolution rates than tension specimens with the same off-axis angle. Under cyclic tension–compression loadings, both on-axis and off-axis specimens exhibit progressive damage deactivation behaviors in the compression range, but with different deactivation rates.
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| 关 键 词： | 碳复合材料 为害特点 本构模型 2D 实验 扫描电子显微镜 压缩载荷 拉伸试验 |
| 收稿时间： | 25 December 2013 |
Damage characteristics and constitutive modeling of the 2D C/SiC composite:Part I-Experiment and analysis |
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| Li Jun Jiao Guiqiong Wang Bo Yang Chengpeng Wang Gang.Damage characteristics and constitutive modeling of the 2D C/SiC composite:Part I-Experiment and analysis[J].Chinese Journal of Aeronautics,2014,27(6):1586-1597. |
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| Authors: | Li Jun Jiao Guiqiong Wang Bo Yang Chengpeng Wang Gang |
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| Institution: | Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an 710129, China |
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| Abstract: | This paper reports an experimental investigation on the macroscopic mechanical behaviors and damage mechanisms of the plain-woven (2D) C/SiC composite under in-plane on- and off-axis loading conditions. Specimens with 15°, 30°, and 45° off-axis angles were prepared and tested under monotonic and incremental cyclic tension and compression loads. The obtained results were compared with those of uniaxial tension, compression, and shear specimens. The relationships between the damage modes and the stress state were analyzed based on scanning electronic microscopy (SEM) observations and acoustic emission (AE) data. The test results reveal the remarkable axial anisotropy and unilateral behavior of the material. The off-axis tension test results show that the material is fiber-dominant and the evolution rate of damage and inelastic strain is accelerated under the corresponding combined biaxial tension and shear loads. Due to the damage impediment effect of compression stress, compression specimens show higher mechanical properties and lower damage evolution rates than tension specimens with the same off-axis angle. Under cyclic tension–compression loadings, both on-axis and off-axis specimens exhibit progressive damage deactivation behaviors in the compression range, but with different deactivation rates. |
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| Keywords: | Ceramic matrix composites Damage Inelastic strain Mechanical testing Strength |
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