Strength Characteristics and Fracture Mechanism of Advanced Continuous Ceramic-Fiber Reinforced Ceramic-Composite

先进连续陶瓷纤维增强陶瓷复合材料的强度特性及断裂机理

基本信息

批准号：
04650064
负责人：
HOSHIDE Toshihiko
金额：
$ 1.28万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Strength characteristics and frature mechanim of a silicon carbide matrix reinforced by continuous silicon carbide fiber were investigated. In the material, satin woven cloths with carbon-coated fiber were impregnated in matrix binder, followed by repeated process of molding, cure and burning. Specimens subjected to loading vertically to stacking layrs and those pallarel to stacking layrs were designated as V-specimen and P-specimen, respectively. Unstable fracture was not observed for both types of specimen, because of interface property refined by carbon coating on fiber. Apparent fracture toughness and bending strength in P-specimen were found to be larger than those in V-specimen. This was resulted from difference in the fracture morphology depending on stacking direction. In V-specimen, pull-out and tensile rapture of fibers were dominant in fracture process, and resulted in separation into two parts. On the other hand, in P-specimen, separation in interlaminate was obserbed before final frature. The differnce in macroscopic fracture pattern was supposed to appear in the fracture resistance. The reinforcement effect by fiber in the present material was investigated by ccmlparison with strength characteristics of the matrix material. In this case, the strength characteristics of the matrix material were estimated by taking account of its bulk density. By the comparison, apparent fracture toughness and bending strength of each type of specimen were found to be larger than those estimated for the matrix. The effect of fiber reinforcement was concluded to be affirmed as long as strength of the bulk material was compared with that of matrix strength.

研究了连续碳化硅纤维增强的碳化硅基质的强度特性和机械机。在材料中，将缎面带有碳涂层纤维的缎布被浸渍在基质粘合剂中，然后重复进行成型，治愈和燃烧的过程。垂直加载的标本分别被指定为堆叠式外行，分别指定为v-layrs的pallarel。两种样本都没有观察到不稳定的裂缝，因为纤维上的碳涂层精致的界面特性。发现p特异性的明显断裂韧性和弯曲强度大于v可能性的裂缝韧性。这是由于骨折形态的差异而导致的，具体取决于堆叠方向。在V特异性中，纤维的拉出和拉伸曲折在断裂过程中占主导地位，并将分离分为两部分。另一方面，在p特定的情况下，在最终弗尔特尔之前观察到了互层的分离。宏观裂缝模式的不同之处在于裂缝抗性。纤维在本材料中的增强作用通过CCMlparison和基质材料的强度特征进行了研究。在这种情况下，通过考虑其大体密度来估计基质材料的强度特性。相比之下，发现每种样品的明显断裂韧性和弯曲强度大于矩阵估计的标本。只要将块状材料的强度与基质强度的强度进行比较，纤维增强的效果就得到了肯定。