为了研究国产2DSiC/SiC复合材料的拉伸损伤行为以及低周循环载荷作用下的力学性能,通过试验和建立加卸载细观力学模型,对其拉伸加卸载行为进行了探讨.建立了单向连续纤维增强陶瓷基复合材料加卸载细观力学模型,得到了初始加载、卸载和重新加载时的应力应变关系;利用断裂统计方法得到了基体裂纹数随应力变化的关系和复合材料失效判断条件.经过应力转化,将该模型应用于国产二维编织SiC/SiC复合材料.对单向加载试件,采用正交试验方法和最小二乘法得到基体Weibull模量和界面剪切阻力,通过控制材料失效强度与试验结果一致,得到纤维Weibull模量.由上述参数确定的2D-SiC/SiC复合材料拉伸循环加卸载应力应变曲线与实测曲线吻合很好.通过Matlab编程得到2D-SiC/SiC复合材料单向加载时基体开裂过程图.结果表明,2DSiC/SiC复合材料失效时,基体裂纹分布相对比较均匀;基体裂纹数随应力单调增加,未出现持平段,表明材料失效时,基体裂纹还没有达到饱和.
参考文献
| [1] | 张立同,成来飞.连续纤维增韧陶瓷基复合材料可持续发展战略探讨[J].复合材料学报,2007(02):1-6. |
| [2] | 胡海峰,张玉娣,邹世钦,周新贵,张长瑞.SiC/SiC复合材料及其在航空发动机上的应用[J].航空制造技术,2010(06):90-91. |
| [3] | 李世波,徐永东,张立同.碳化硅纤维增强陶瓷基复合材料的研究进展[J].材料导报,2001(01):45-49. |
| [4] | 杨福树,孙志刚,李龙彪,高希光,宋迎东.界面脱粘对正交铺设SiC/CAS复合材料基体开裂的影响[J].复合材料学报,2012(04):231-238. |
| [5] | Keith W P,Kedward K T.The stress strain behavior of a porous unidirectional ceramic matrix composite[J].Compos ites,1995,26(3):163-174.,1995. |
| [6] | 李龙彪,宋迎东,孙志刚.界面脱粘对陶瓷基复合材料疲劳迟滞回线的影响[J].固体力学学报,2009(01):8-14. |
| [7] | Li L B,Song Y D.Estimate interface frictional coefficient of ceramic matrix composites from hysteresis loops[J].Journal of Composite Materials,2011,45(9):989-1006.,2011. |
| [8] | Ahn B K,Curtin W A.Strain and hysteresis by stochastic matrix cracking in ceramic matrix composites[J].Journal of the Mechanics and Physics of Solids,1997,45(2):177-209.,1997. |
| [9] | Pryce A W,Smith P A.Matrix cracking in unidirectional ce ramic matrix composites under quasi static and cyclic loading[J].Acta Metallurgica et Materialia,1993,41(4):1269-1281.,1993. |
| [10] | Solti J P,Mall S,Robertson D D.Modeling damage in unidi rectional ceramic matrix composites[J].Composites Science and Technology,1995,54(1):55-66.,1995. |
| [11] | Guillaumat L,Lamon J.Fracture statistics applied to model ing the non linear stress strain behavior in microcomposites:influence of interfacial parameters[J].International Journal of Fracture,1996,82(4):297-316.,1996. |
| [12] | Evans A G,Domergue J M,Vagaggini E.Methodology for relating the tensile constitutive behavior of ceramic matrix composites to constituent properties[J].Journal of the A merican Ceramic Society,1994,77(6):1425-1435.,1994. |
| [13] | Curtin W A.Theory of mechanical properties of ceramic ma trix composites[J].Journal of American Ceramic Society,1991,74(11):2837-2845.,1991. |
| [14] | Pryce A W,Smith P A.Matrix cracking in unidirectional ce ramic matrix composites under quasi static and cyclic loading[J].Acta Metallurgica et Material,1993,41(4):1269-1282.,1993. |
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%