在室温最大应力为250 MPa、应力比R=0.1和频率为60 Hz条件下,对3D-C/SiC复合材料进行了拉-拉疲劳试验.用共振法和电阻增量仪分别测试了杨氏模量及电阻的变化.结果表明:随循环次数增加,杨氏模量呈显著下降、缓慢下降和突然下降的变化规律.杨氏模量的下降大部分发生在疲劳循环的前600次.缓慢降低阶段约占疲劳寿命的94%以上,此阶段杨氏模量变化率与循环次数的对数近似呈线性关系;电阻变化率除首次循环降低外,随着循环次数增加一直在增加.增加规律大致可分为缓慢增加、台阶式增加和急剧增加三个阶段.材料的电阻变化率基本反映了纤维的损伤程度和破坏形式,可作为表征复合材料纤维损伤的有效参量.
参考文献
| [1] | Mizuino M;zhu S;Nagano Y;Sakaida Y,Kagawa Y,Kaya H .Cyclic fatigue behavior of SiC/SiC composite at room temperature and high temperature[J].Journal of the American Ceramic Society,1996,79(12):3065-3077. |
| [2] | Holmes J.W.;Vanswijgenhoven E.L. .Rate of Strength Decrease of Fiber-Reinforced Ceramic-Matrix Composites during Fatigue[J].Journal of the American Ceramic Society,2000(6):1469-1475. |
| [3] | Holes J W et al.Frequency dependence of fatigue life and internal heating of a fiber-reinforced ceramic-matrix composite[J].Journal of the American Ceramic Society,1994,77(12):3284-3286. |
| [4] | Lamoruroux F;Bourrat X;Naslain R .Structure/oxidation behavior relationship in the carboaceous constituents of 2D-C/prC/SiC composites[J].Carbon,1993,31(08):1273. |
| [5] | Boccaccini AR;Pearce DH;Janczak J;Beier W;Ponton CB .Investigation of cyclic thermal shock behaviour of fibre reinforced glass matrix composites using non-destructive forced resonance technique[J].Materials Science and Technology: MST: A publication of the Institute of Metals,1997(10):852-858. |
| [6] | Karandikar P G;Chou Tsu-Wei .Damage development and modulus reduction in Nicalon-Calcium Aluminosilicate composites under static fatigue and cyclic fatigue[J].Journal of the American Ceramic Society,1993,76(07):1720-1728. |
| [7] | Chen X Fu;Chung D D L .[J].ACI Materials Journal,1997,94(02):147-155. |
| [8] | Chen P;Chung D D L .[J].Journal of Electronic Materials,1995,24(01):47-51. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%