缩进
断裂韧性
材料科学
断裂(地质)
复合材料
残余强度
陶瓷
韧性
结构工程
法律工程学
工程类
作者
P. Chantikul,G. R. Anstis,Brian R. Lawn,D. B. Marshall
标识
DOI:10.1111/j.1151-2916.1981.tb10321.x
摘要
An examination is made of the sharp‐indentation technique of strength‐test precracking for toughness evaluation. The experimental approach follows that proposed by other workers but the theoretical analysis contains one vital new feature; the residual‐stress term discussed in Part I of this study is now introduced explicitly into the strength formulation. This modification overcomes a major systematic discrepancy evident in the previous models and at the same time, by virtue of attendant changes in the nature of the crack stability prior to attaining a failure configuration, eliminates the need for frac‐tographic measurements. Other advantages are also apparent, notably an insensitivity to postindentation radial crack extension. The main disadvantage is that only one result is obtained per specimen. Indentation/strength data from ceramics listed in Part I confirm the essential features of the theory and provide a suitable calibration factor. The method has special application to those materials which do not necessarily produce a well‐defined radial crack pattern, in which case an “effective” K c appropriate to fracture properties at the flaw level is obtained.
科研通智能强力驱动
Strongly Powered by AbleSci AI