TY - JOUR
T1 - Influence of notch shape and geometry during creep crack growth testing of TiAl intermetallic compounds
AU - Fuji, Akio
AU - Tabuchi, Masaaki
AU - Yokobori, A. Toshimitsu
AU - Yokobori, Takeo
N1 - Funding Information:
The present study was conducted under the support of the RFTF program 97R12101, Japan Society for Promoting Science. Also an appreciation is made to the aids of the Science and Technology Agency of Japan. The authors gratefully acknowledge the support from the members of JSPS 129 Committee (Chairman: Professor T. Yokobori).
PY - 1999/1
Y1 - 1999/1
N2 - In order to establish the optimum pre-crack shape and geometry for creep crack growth (CCG) testing of high-temperature brittle materials, several shapes of starter notches were evaluated experimentally on TiAl intermetallic compound. Fatigue pre-cracks are frequently inappropriate in these materials because they tend to promote out-of-plane crack growth in the lamellar structured TiAl materials. Based on the experimental results with several notch shapes and also an analytic assessment of stress distribution around notch-tip, a V-notched specimen is proposed as being optimum for generating creep crack growth data in lamellar structured TiAl. A procedure for machining the notches to minimize its effect on the CCG behavior is also outlined.
AB - In order to establish the optimum pre-crack shape and geometry for creep crack growth (CCG) testing of high-temperature brittle materials, several shapes of starter notches were evaluated experimentally on TiAl intermetallic compound. Fatigue pre-cracks are frequently inappropriate in these materials because they tend to promote out-of-plane crack growth in the lamellar structured TiAl materials. Based on the experimental results with several notch shapes and also an analytic assessment of stress distribution around notch-tip, a V-notched specimen is proposed as being optimum for generating creep crack growth data in lamellar structured TiAl. A procedure for machining the notches to minimize its effect on the CCG behavior is also outlined.
KW - CT specimen
KW - Creep crack growth
KW - Fatigue pre-cracking
KW - Notches
KW - TiAl intermetallic compound
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U2 - 10.1016/s0013-7944(98)00080-0
DO - 10.1016/s0013-7944(98)00080-0
M3 - Article
AN - SCOPUS:0032678178
SN - 0013-7944
VL - 62
SP - 23
EP - 32
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
IS - 1
ER -