摘要
采用Mori-Tanaka方法分两步计算了含孔洞C/SiC纤维束的弹性常数,并进一步考虑经向纤维束在空间上的不完全连续,给出了更为准确的2.5D-C/SiC复合材料弹性性能计算模型。分析了纤维束内部孔洞形状及体积含量对2.5D-C/SiC复合材料弹性性能的影响,结果表明纤维束内部孔洞的形状对材料弹性性能影响较小,而纤维束内孔洞体积含量对材料弹性性能具有显著影响。通过材料的细观编织结构分析,基于经向纤维束的实际接触面积比例给出了相应的模量折减系数,计算得到2.5D-C/SiC复合材料的弹性常数,与试验结果的对比表明该计算模型更为合理。
By using Mori-Tanaka equivalent method,the C/SiC bundle with voids was treated as a double inclusion problem and the effective elastic moduli of the bundle were calculated.A new predictive model of elastic properties for 2.5D-C/SiC composites is developed with the consideration of the incomplete linkage of the C/SiC bundles.The relationship between the volume fraction and shape of voids in C/SiC bundle and elastic properties were obtained by the predictive model.The calculations disclose that the shape of voids has little effect on elastic properties of composites,and the void volume fraction has obvious effect on elastic properties of 2.5D-C/SiC composites.The degradation coefficients were given by the real contacting area ratio of warps and the elastic parameters of the 2.5D-C/SiC composite were calculated,and the comparison with theoretical and experimental results demonstrates that the new model is more accurate.
出处
《工程力学》
EI
CSCD
北大核心
2011年第3期230-233,239,共5页
Engineering Mechanics
基金
国家自然科学基金项目(90405015
90815001
10902025)
中国博士后科学基金项目(20090460839)
广西大学科研基金项目(XBZ100713)
