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Steady-State Tearing of 25, 50, and 125 Micrometer Thick Aluminum Sheets
Steady-State Tearing of 25, 50, and 125 Micrometer Thick Aluminum Sheets
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Author(s)
Muhlstein, Christopher L
Lanning, Wade R.
Johnson, Camilla E.
Javaid, Syed S.
Lanning, Wade R.
Johnson, Camilla E.
Javaid, Syed S.
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Abstract
The steady-state crack growth of 25.4, 50.8, and 127 micrometer thick 1235 aluminum sheets was characterized under quasistatic loading conditions in laboratory air. Because steady-state crack propagation cannot be characterized by conventional linear-elastic (\textit{K}) or elastic-plastic (\textit{J}) crack tip parameters we used a fully-yielded plastic crack growth resistance analysis to identify when cracks reached steady-state propagation conditions. At steady-state a constant, characteristic crack growth resistance of 60 MPa, 95 MPa, and 93 MPa was observed for the 25.4, 50.8 and 127 micrometer thickness sheets, respectively. This steady-state crack growth is dramatically different from conventional linear elastic and elastic plastic crack growth because the plastic zone is uncontained and extends across the remaining ligament.
Sponsor
National Science Foundation (U.S.), Grant No. 1609817
Date Issued
2019
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