TY - GEN
T1 - Crack propagation in lamellar TiAl under mode i loading
AU - Chiang, Fu Pen
AU - Ding, Yi
AU - Uzer, Gunes
AU - Ho, Andrew
AU - Rosenberger, Andrew H.
PY - 2006
Y1 - 2006
N2 - A unique macro/micro- speckle technique for deformation measurement is exploited to investigate the crack propagation characteristics of lamellar TiAl with the grain size of approximately 450μm. A single edge notch (SEN) specimen tested under uniaxial tension inside a scanning electron microscope (SEM). The specimen was gradually loaded under incremental forces and the SEM image was taken at each step of the loading until it failed. The displacement and strain fields were measured using the electron speckle technique. The analysis of data shows that the lamellar orientation and grain boundary of TiAl play major roles in the characteristics of crack propagation. The highest resistance to crack advance is when the crack is normal to the lamellar orientation whereas the weakest link is when the interface is parallel to the orientation of the crack. Moreover, we find that a concentrated strain filed tends to be the prelude of a sudden crack jump. The shear strain also plays an important role in crack advance by shear banding.
AB - A unique macro/micro- speckle technique for deformation measurement is exploited to investigate the crack propagation characteristics of lamellar TiAl with the grain size of approximately 450μm. A single edge notch (SEN) specimen tested under uniaxial tension inside a scanning electron microscope (SEM). The specimen was gradually loaded under incremental forces and the SEM image was taken at each step of the loading until it failed. The displacement and strain fields were measured using the electron speckle technique. The analysis of data shows that the lamellar orientation and grain boundary of TiAl play major roles in the characteristics of crack propagation. The highest resistance to crack advance is when the crack is normal to the lamellar orientation whereas the weakest link is when the interface is parallel to the orientation of the crack. Moreover, we find that a concentrated strain filed tends to be the prelude of a sudden crack jump. The shear strain also plays an important role in crack advance by shear banding.
UR - http://www.scopus.com/inward/record.url?scp=33750287035&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33750287035
SN - 091205395X
SN - 9780912053950
T3 - Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
SP - 1999
EP - 2005
BT - Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
T2 - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Y2 - 4 June 2006 through 7 June 2006
ER -