TY - GEN
T1 - In-situ fatigue crack growth testing of Al7075-T651 under scanning electron microscopy
AU - Zhang, W.
AU - Liu, Y.
N1 - Funding Information:
The research reported in this paper was supported by funds from the NASA Ames Research Center (Contract No. NNX09AY54A) and by funds from the Federal Aviation Administration William J. Hughes Technical Center (Project Manager: Dr. John Bakuckas) through subcontract to Vanderbilt University (Principal Investigator: Dr. Sankaran Mahadevan). The support is gratefully acknowledged.
PY - 2011
Y1 - 2011
N2 - In this paper, an in-situ scanning electron microscope (SEM) fatigue testing was performed to measure the crack growth kinetics and the corresponding crack tip opening displacement (CTOD) at the any small time instant during the constant cyclic tensile loading. The objective of the experimental study is to verify the hypotheses of a small time scale fatigue crack growth model. During the testing, one loading cycle is divided into a certain number of steps. Images are taken at each step around the crack tip region. Imaging analysis is used to quantify the crack growth kinetics and crack tip deformation behavior at any time instant in a loading cycle. Crack closure phenomenon is observed during the crack growth process. It is also observed that crack growth is not uniformly distributed within a loading cycle and only happens during a small portion of loading path.
AB - In this paper, an in-situ scanning electron microscope (SEM) fatigue testing was performed to measure the crack growth kinetics and the corresponding crack tip opening displacement (CTOD) at the any small time instant during the constant cyclic tensile loading. The objective of the experimental study is to verify the hypotheses of a small time scale fatigue crack growth model. During the testing, one loading cycle is divided into a certain number of steps. Images are taken at each step around the crack tip region. Imaging analysis is used to quantify the crack growth kinetics and crack tip deformation behavior at any time instant in a loading cycle. Crack closure phenomenon is observed during the crack growth process. It is also observed that crack growth is not uniformly distributed within a loading cycle and only happens during a small portion of loading path.
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U2 - 10.2514/6.2011-1985
DO - 10.2514/6.2011-1985
M3 - Conference contribution
AN - SCOPUS:84872439686
SN - 9781600869518
T3 - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
BT - 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
T2 - 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Y2 - 4 April 2011 through 7 April 2011
ER -