A. Fuji et al., Influence of notch shape and geometry during creep crack growth testing ofTiAl intermetallic compounds, ENG FRACT M, 62(1), 1999, pp. 23-32
In order to establish the optimum pre-crack shape and geometry for creep cr
ack growth (CCG) testing of high-temperature brittle materials, several sha
pes of starter notches were evaluated experimentally on TiAl intermetallic
compound. Fatigue pre-cracks are frequently inappropriate in these material
s because they tend to promote out-of-plane crack growth in the lamellar st
ructured TiAl materials. Based on the experimental results with several not
ch shapes and also an analytic assessment of stress distribution around not
ch-tip, a V-notched specimen is proposed as being optimum for generating cr
eep crack growth data in lamellar structured TiAl. A procedure for machinin
g the notches to minimize its effect on the CCG behavior is also outlined.
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