کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1467147 | 990090 | 2010 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Experimental characterization of high-speed impact damage behavior in a three-dimensionally woven SiC/SiC composite Experimental characterization of high-speed impact damage behavior in a three-dimensionally woven SiC/SiC composite](/preview/png/1467147.png)
This paper discusses high-speed impact damage in a three-dimensionally woven SiC/SiC composite (3D-CMC). The impact damage was introduced by a steel ball projectile in 3D-CMC plates with and without thermal exposure. The surface and internal damages were observed by optical microscopy and X-ray CT. A crater was observed on the collision surface. The X-ray CT measurement revealed that multiple pyramid-shaped cone cracks were generated beneath the crater when the impact speed was relatively low. At an impact speed exceeding the critical speed, a spall fragment was ejected from the back surface, while no internal damage was observed in the fragment. The spall fracture mode differed between the virgin and the thermally-exposed specimens. This difference is the result of embrittlement of the fiber/matrix interface due to oxidation of the carbon coating layer in the thermally-exposed specimen. In addition, it is found that z-yarns improve impact resistance by constraining delamination.
Journal: Composites Part A: Applied Science and Manufacturing - Volume 41, Issue 4, April 2010, Pages 489–498