INSITU MEASUREMENTS OF BRIDGED CRACK INTERFACES IN THE SCANNING ELECTRON-MICROSCOPE

被引：195

作者：

RODEL, J

KELLY, JF

LAWN, BR

机构：

[1] Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 11期

关键词：

bridging; cracks; pullout; scanning electron microscopy; toughness;

D O I：

10.1111/j.1151-2916.1990.tb06454.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A device for in situ SEM examination of crack propagation during loading of compact tension specimens is described, with a specific demonstration on an alumina ceramic. The device facilitates direct qualitative observations of the inception and subsequent frictional pullout of grain‐localized bridges at the crack interface. Quantitative data on the bridging mechanism are obtained from measurements of the crack‐opening displacements behind the crack tip. The crack profile is found to be closer to linear than parabolic at the bridged interface. Deconvolution of these crack‐opening data allow for an evaluation of the closure tractions operative at the crack walls within the bridging zone, and thence the R‐curve. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：3313 / 3318

页数：6

共 26 条

[1]

Barenblatt GI., 1962, ADV APPL MECH, V7, P55, DOI DOI 10.1016/S0065-2156(08

[2] ROLE OF INTERFACIAL GRAIN-BRIDGING SLIDING FRICTION IN THE CRACK-RESISTANCE AND STRENGTH PROPERTIES OF NONTRANSFORMING CERAMICS [J].