期刊
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
卷 38, 期 2, 页码 201-212出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0020-7462(01)00055-5
关键词
ceramic matrix composites; physical nonlinearity; matrix cracks; vibrations
类别
The present paper illustrates the effect of matrix cracks in longitudinal and transverse layers of cross-ply ceramic matrix composite (CMC) beams on their mechanical properties and vibration frequencies. Even in a geometrically linear problem considered in the paper, the physical non-linearity is introduced by matrix cracks and interfacial fiber-matrix friction in longitudinal layers. A closed-form solution for mechanical properties of a cross-ply CMC beam with matrix cracks is developed in the paper. The frequency of free vibrations of a simply supported beam is derived as a function of the amplitude, accounting for the effect of matrix cracks. As shown in the paper, the prediction of the natural frequencies of cross-ply CMC beams with matrix cracks in both longitudinal and transverse layers is possible using simple, yet accurate, approximate equations. (C) 2002 Elsevier Science Ltd. All rights reserved.
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