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Flexural failure mechanism of 2.5D woven SiCf/SiC composites: Combination of acoustic emission, digital image correlation and X-ray tomography
Composites Communications ( IF 8 ) Pub Date : 2021-09-04 , DOI: 10.1016/j.coco.2021.100921
Yadi Duan 1 , Haipeng Qiu 2 , Tiantian Yang 1 , Ling Wang 2 , XiaoMeng Wang 2 , Weijie Xie 2 , Kun Qian 1 , Diantang Zhang 1
Affiliation  

2.5D woven SiCf/SiC composites are candidate materials for high-temperature components. This work presents the flexural progressive damage behaviors of 2.5D woven SiCf/SiC composites using the combination techniques of acoustic emission (AE), digital image correlation (DIC) and X-ray micro-computed tomography (Micro-CT). 2.5D woven samples with 0° (warp) and 90° (weft) directions and 2D woven laminated samples are experimentally tested via three points bending method. Also, in this process, AE and DIC are employed to monitor the progressive damage process. Subsequently, Micro-CT is utilized to identify the internal damage evolution. The results show that the preform structures and the tested directions both have a significant influence on the mechanical properties and failure mechanisms of 2.5D woven SiCf/SiC composites. Detailly, 2.5D warp samples present the pseudo-ductile fracture, whereas 2.5D weft samples indicate the brittle fracture. Furthermore, the dominant failure mechanisms of 2.5D warp samples are mainly influenced by the bulking warps, whereas those of 2.5D weft samples are controlled by the straight wefts.



中文翻译:

2.5D编织SiCf/SiC复合材料的弯曲破坏机制:声发射、数字图像相关和X射线断层扫描的结合

2.5D 编织 SiC f /SiC 复合材料是高温部件的候选材料。这项工作展示了 2.5D 编织 SiC f的弯曲渐进损伤行为/SiC 复合材料使用声发射 (AE)、数字图像相关 (DIC) 和 X 射线显微计算机断层扫描 (Micro-CT) 的组合技术。通过三点弯曲法对0°(经向)和90°(纬向)方向的2.5D编织样品和2D编织层压样品进行实验测试。此外,在这个过程中,AE 和 DIC 被用来监控渐进式损坏过程。随后,利用 Micro-CT 来识别内部损伤演变。结果表明,预制件结构和测试方向均对 2.5D 编织 SiC f的力学性能和失效机制有显着影响。/SiC 复合材料。详细地说,2.5D 经向样品呈现假韧性断裂,而 2.5D 纬向样品表明脆性断裂。此外,2.5D 经线样品的主要失效机制主要受膨胀经线的影响,而 2.5D 纬线样品的主要失效机制受直纬线控制。

更新日期:2021-09-08
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