细观结构对编织SiC/SiC叶冠强度与失效模式的影响

Impact of mesostructure on the strength and failure mode of textile SiC/SiC blade tips

  • 摘要: 通过室温下静强度拉伸试验对比分析了化学气相渗透工艺制备的9种不同细观结构设计方案的陶瓷基复合材料编织型SiC/SiC叶冠试件的力学性能,并利用声发射(AE)系统和数字图像相关技术(DIC)实时监测失效过程,结合扫描电子显微镜(SEM)分析试件宏细观断口形貌,最终揭示了不同细观结构对陶瓷基复合材料叶冠失效模式的影响。结果表明,(a)合股-部分交错连接方案平均失效强度最高,最高为5.26 kN;(b)三种分层结构方案及三种合股方案中,呈现出部分交错结构强度最高,无交错结构次之,全交错结构强度最低;(c)叶身-叶冠连接位置纱线织造复杂度的提升,有利于增强承载能力但是也降低了试件形状与设计值符合度,同时也引起预制体在织造过程中纤维束磨损程度的提高,导致纤维性能的下降;

     

    Abstract: The mechanical properties of nine different microstructural designs of textile-type SiC/SiC blade tip specimens prepared using the chemical vapor penetration process were compared and analyzed through static tensile tests at room temperature. The failure process was monitored in real time using an acoustic emission (AE) system and digital image correlation (DIC) technology, combined with scanning electron microscopy (SEM) analysis of the macrostructural and microstructural fracture morphology of the specimens, ultimately revealing the influence of microstructure on the failure mode. The results showed that: (a) the stranded-partially interlaced connection scheme had the highest average failure strength, reaching a maximum of 5.26 kN; (b) among the three layered structure schemes and three stranded schemes, the partially interlaced structure exhibited the highest strength, followed by the non-interlaced structure, with the fully interlaced structure having the lowest strength; (c) Increasing the complexity of yarn weaving at the blade-to-tip connection location enhances load-bearing capacity but reduces the conformity of specimen shape to design values, and also increases fiber bundle wear during weaving, leading to a decline in fiber performance.

     

/

返回文章
返回