Experimental characterization of high-speed impact damage behavior in a three-dimensionally woven SiC/SiC composite

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• 作者：Keiji Ogi ; Tomonaga Okabe ; Manabu Takahashi ; Shigeki Yashiro ; Akinori Yoshimura ; Toshio Ogasawara
• 关键词：A. Ceramic-matrix composites (CMCs) ; B. Impact behavior ; D. Radiography
• 刊名：Composites Part A: Applied Science and Manufacturing (Incorporating Composites and Composites Manufacturing)
• 出版年：2010
• 出版时间：April 2010
• 年：2010
• 卷：41
• 期：4
• 页码：489-498
• 全文大小：1543 K

文摘

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.