Characterization of Dynamic Tensile Testing Using Aluminum Alloy 6061-T6 at Intermediate Strain Rates
Publication: Journal of Engineering Mechanics
Volume 137, Issue 10
Abstract
Dynamic tensile tests are conducted on aluminum alloy (AA) 6061-T6 using a high-speed servohydraulic machine at intermediate strain rates to validate the testing technique and to investigate the strain-rate effect on the material’s stress-strain behavior and failure mode. We present the experimental procedures and results discussing the constitutive response of the alloy at strain rates up to approximately . The predominant frequencies of the high-speed testing machine were characterized by modal analysis, and we analyzed the effect from vibration of the system and loading rate on flow stress by using a single degree-of-freedom (SDOF) spring-mass-damper model. We tested two different specimen sizes at a wide range of actuator velocities to achieve the desired strain rates. Results show that the yield strength, ultimate strength, and failure strain were dependent on strain rate. We fitted the data to the Johnson-Cook (JC) constitutive model, and the resulting parameters are comparable to published results in the literature. The fracture surface of specimens tested at different strain rates obtained by scanning electron microscopy (SEM) showed that the ductile failure mode was dominant for the alloy, and strain rates within the range examined affected the fracture morphology.
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Acknowledgments
The authors wish to thank William Emmerling, Donald Altobelli, and Chip Queitzsch of the Federal Aviation Administration’s (FAA) Aircraft Catastrophic Failure Prevention Research Program for their support and guidance. Funding for this effort was provided by the FAAFAA. The authors would like to acknowledge use of facilities within the Center for Solid State Science at Arizona State University, especially the help from Mr. Amir Bonakdar for the SEM images.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 137 • Issue 10 • October 2011
Pages: 669 - 679
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 20, 2009
Accepted: Mar 14, 2011
Published online: Mar 16, 2011
Published in print: Oct 1, 2011
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