摘要
A preform consisting of plain weave fabric and z-pin through-thickness reinforcements was prepared. The carbon matrix was derived from a combination of isothermal chemical vapor infiltration and high-pressure impregnation-carbonization of coal tar pitch. The interlaminar shear strength of the composites was characterized by a short beam interlaminar shear test and a double edge-notched tensile shear test. Hyper pseudoplastic fracture behavior of short beam interlaminar shear of 3D C/C composites was found, which is ascribed to the propagation of microcracks formed between laminations within and between bundles. Z-pins can have effective control over the progress of pseudoplastic fracture. True shear failure, which is characterized by the double edge-notched tensile test, shows non-pseudoplastic fracture progress that is ascribed to shear sliding occurring only within one interlamination. Both short beam interlaminar strength and double edge-notched tensile strength are 40%-50% higher for a z-pin density of 1.5 mm interval than those for a z-pin density of 2.5 mm interval. Employing z-pins as through-thickness reinforcements has advantages over a 3D weave.
源语言 | 英语 |
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页(从-至) | 97-102 |
页数 | 6 |
期刊 | Xinxing Tan Cailiao/New Carbon Materials |
卷 | 19 |
期 | 2 |
出版状态 | 已出版 - 6月 2004 |