Evaluation of fatigue crack propagation by mode I and mixed mode in 1050 aluminium |
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| Authors: | C MAKABE T YAMANE D F SOCIE T SUEYOSHI |
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| Affiliation: | Professor, Department of Mechanical Systems Engineering, University of the Ryukyus, 1 Nishihara, Okinawa, 903-0213, Japan;, Graduate Student, Graduate School of Science and Engineering, University of the Ryukyus, 1 Nishihara, Okinawa, 903-0213, Japan;, Professor, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801, USA;, Associate Professor, Department of Mechanical Systems Engineering, University of the Ryukyus, 1 Nishihara, Okinawa, 903-0213, Japan |
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| Abstract: | The mechanism of mixed‐mode fatigue crack propagation was investigated in pure aluminum. Push‐pull fatigue tests were performed using two types of specimens. One was a round bar specimen having a blind hole, one was a plate specimen having a slit. The slit direction cut in the specimen was perpendicular or inclined 45 degrees relative to the centre of the specimen axis. In both cases, cracks propagated by mode I or by the mixed mode combining mode I and shear mode, depending on the testing conditions. In these cases the crack propagation rate was evaluated with a modified effective stress intensity factor range. Crack propagation retardation was observed in some specimens. However, it was found that the crack propagation rate could also be evaluated by the effective stress intensity factor range independent of the crack propagation mode. |
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| Keywords: | aluminium crack propagation effective stress intensity fatigue mixed mode |
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