| 陶瓷基复合材料结构固有频率与内部损伤分析 |
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| 引用本文： | 汪佳辉,吴锦武,郭小军,胡晓安,李龙彪,王海涛.陶瓷基复合材料结构固有频率与内部损伤分析[J].失效分析与预防,2021,16(3):177-183. |
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| 作者姓名： | 汪佳辉 吴锦武 郭小军 胡晓安 李龙彪 王海涛 |
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| 作者单位： | 1.南昌航空大学 飞行器工程学院，南昌 330063 |
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| 摘 要： | 通过室温条件下的循环加卸载试验，研究编织SiC/SiC复合材料固有频率特性及内部损伤演化过程。结果表明:固有频率随循环加卸载过程中峰值应力的增大而减小，通过分别定义频率衰退参数Φ与模量衰退参数D表征了复合材料固有频率与弹性模量的折减程度。基于细观力学理论对编织陶瓷基复合材料循环加卸载迟滞回线进行理论计算，理论模拟结果与试验数据良好吻合。同时，分析计算结果还发现，随着循环加卸载过程中Φ的增加，材料弹性模量衰退参数D、界面脱粘比2ld/lc和纤维断裂概率q均呈明显上升趋势，当陶瓷基复合材料结构固有频率衰退1%时，基体出现开裂，界面发生脱粘；当固有频率衰退4.17%时，2ld/lc上升至1（即完全脱粘），q增加到2.5%，这表明复合材料固有频率的变化可以反映出材料内部的损伤失效过程。
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| 关 键 词： | 陶瓷基复合材料 二维编织 固有频率 迟滞回线 损伤分析 |
| 收稿时间： | 2021-01-29 |
Analysis of Structural Natural Frequency and Internal Damage of Ceramic Matrix Composites |
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| WANG Jia-hui,WU Jin-wu,GUO Xiao-jun,HU Xiao-an,LI Long-biao,WANG Hai-tao.Analysis of Structural Natural Frequency and Internal Damage of Ceramic Matrix Composites[J].Failure Analysis and Prevention,2021,16(3):177-183. |
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| Authors: | WANG Jia-hui WU Jin-wu GUO Xiao-jun HU Xiao-an LI Long-biao WANG Hai-tao |
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| Abstract: | Natural frequency characteristics and damage evolution of woven SiC/SiC composites were investigated under cyclic loading-unloading test at room temperature. The results show that the natural frequency decreases with the increase of peak stress during the runs, then the natural frequency and elastic modulus reduction degree of the composites were determined by defining the frequency decay parameter Φ and the modulus decay parameter D, respectively. Based on the micromechanics theory, the cyclic loading and unloading hysteresis loops of woven ceramic matrix composites were calculated theoretically, and the simulation results are in good agreement with the experimental data. Besides, the analysis reveals that the modulus decay parameter D, the interfacial debonding ratio 2ld/lc, and the fiber fracture probability q all exhibite an obvious upward trend with the increased frequency decay parameter Φ. Matrix cracking and interfacial debonding took place when the natural frequency of composites declined by 1%. Moreover, when the natural frequency decreased by 4.17%, the interfacial debonding ratio was increased to 1 (that is fully debonding), and the fiber fracture probability was increased to 2.5%, which indicates that the variation of natural frequency can effectively reflect the internal damage and invalidation process of the material. |
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