脆性材料断裂韧性测定的山形缺口试件和方法

本文扼要地介绍了测定新型结构陶瓷、高强度金属、以及其他脆性材料断裂韧性的山形缺口试件与方法。概述了这个方法的发展史、优缺点、目前研究概况、主要理论分析与实验研究成果,以及存在的问题和发展动向。

Chevron-Notched Specimen and Method for Measuring Fracture Toughness of Brittle Materials

In the present paper,a brief review on the chevron-notched specimen and therelated testing method is presented.Since this kind of specimens is quite small andsaving in material,and the experimental procedure is simple and economical,thechevronnotched specimen method is being increasingly used to measure fracturetoughness of ceramics,glass,rock and high strength metals.At first,the categories of the specimens and the advantages and disadvantagesof this method are described.Then,a concise account on the developing history ofthe method in the last decade,the main theoretical and experimental achievementsobtained and the up-to-date research status are given.The approaches to determin-ing the minimum normalised stress intensity factor are reviewed.Finally,sometypical applications are exemplified:the encountered problems and the developingtrend are critically commented.