scholarly journals Determination of fracture toughness parameter of quasi-brittle materials with laboratory-size specimens

1989 ◽  
Vol 24 (3) ◽  
pp. 854-862 ◽  
Author(s):  
C. K. Y. Leung ◽  
V. C. Li
Keyword(s):  
Fracture Toughness ◽  
Brittle Materials ◽  
Toughness Parameter

Determination of fracture toughness and fracture energy of brittle materials under impact wedging

1996 ◽  
Vol 37 (4) ◽  
pp. 586-594 ◽  
Author(s):  
A. S. Eremenko ◽  
S. A. Novikov ◽  
V. A. Sinitsyn ◽  
V. A. Pushkov ◽  
M. M. Yakupov
Keyword(s):  
Fracture Toughness ◽  
Fracture Energy ◽  
Brittle Materials

scholarly journals Determination of fracture toughness using the area of micro-crack tracks left in brittle materials by Vickers indentation test

2013 ◽  
Vol 2 (1) ◽  
pp. 87-102 ◽  
Author(s):  
Alireza Moradkhani ◽  
Hamidreza Baharvandi ◽  
Mehdi Tajdari ◽  
Hamidreza Latifi ◽  
Jukka Martikainen
Keyword(s):  
Fracture Toughness ◽  
Brittle Materials ◽  
Indentation Test ◽  
Vickers Indentation

Determination of fracture toughness from the extra penetration produced by indentation-induced pop-in

2003 ◽  
Vol 18 (6) ◽  
pp. 1412-1419 ◽  
Author(s):  
J. S. Field ◽  
M. V. Swain ◽  
R. D. Dukino
Keyword(s):  
Fracture Toughness ◽  
Crack Length ◽  
Radial Crack ◽  
Brittle Materials ◽  
Critical Stress Intensity Factor ◽  
Fused Silica ◽  
Modulus Ratio ◽  
Material Volume ◽  
Radial Cracks

The fracture toughness of small volumes of brittle materials may be investigated by using pyramidal indenters to initiate radial cracks. The length of these cracks, together with indenting load and the hardness to modulus ratio of the material, were combined to calculate the critical stress intensity factor Kc pertinent to fracture toughness. Modulus and hardness may be obtained from the literature or may be measured using nanoindentation techniques. If the material volume is very small, such as single grains in a conglomerate, a reduction of scale may be obtained by reducing the internal face angles of the indenter. This encourages crack initiation at lower loads, but cracks produced at very low loads are short and difficult to measure. Experiments on fused silica and glassy carbon suggested that radial cracks are initiated during loading and that when indenters with sufficiently small angles are used these cracks immediately pop-in, to become fully developed median/radial crack systems. Following pop-in, the rate of penetration of the indenter increases and at higher loads there is an extra increment of penetration over that which would otherwise have occurred. In this study a method is described whereby this extra penetration may be determined. Then for two dissimilar brittle materials, crack length is shown to be correlated with extra penetration leading to a relationship that may possibly avoid the necessity for crack-length measurement.

Nanoindentation Assessed Fracture Toughness of Cement Paste

2016 ◽  
Vol 368 ◽  
pp. 186-189 ◽  
Author(s):  
Jiří Němeček ◽  
Vladimír Hrbek
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Fracture Energy ◽  
Cement Paste ◽  
Quantitative Data ◽  
Brittle Materials ◽  
Fracture Properties ◽  
Micro Scale ◽  
Energetic Approach

This paper deals with fracture properties of microlevel components of hydrated cementpaste. Determination of fracture energy and fracture toughness for quasi-brittle materials hasbecome a challenge for many years on both macro- and micro-scales. Limited number of quantitative data can be found in the literature for the micro-scale. This work uses energetic approach and decomposition of work of indentation into plastic and other parts. Based on simplified assumptions fracture energy and fracture toughness are calculated for individual microstructural phases of cement paste with the aid of nanoindentation, statistical deconvolution and fracture mechanics.

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