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Low Cycle Fatigue of A356-T6 Cast Aluminum Alloy
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Abstract
Smooth specimen low cycle fatigue behavior of A356-T6 cast aluminum alloy with secondary dendritic arm spacing (DAS) of 36 and 58 µm was obtained under room temperature test conditions. Under strain-controlled axial fatigue conditions, cyclic strain hardening occurred for both DAS values. Hysteresis loops were skewed from 1 to 13% toward the compression side. At higher strain amplitudes the smaller DAS had slightly better fatigue resistance while at the lower strain amplitudes the fatigue resistance was essentially the same for both DAS values. Many test specimens failed outside the test gage length and were thus considered invalid tests. This large number of invalid tests was attributed to surface and near surface discontinuities. Log-log linear low cycle fatigue properties were obtained but these values should be used with caution due to apparent bi-linear log-log elastic strain-life behavior.
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Wigant, C. and Stephens, R., "Low Cycle Fatigue of A356-T6 Cast Aluminum Alloy," SAE Technical Paper 870096, 1987, https://doi.org/10.4271/870096.Also In
References
- Testin R.A. “SAE Cast Metals Task Group Participant” Cast Aluminum Progress Report” September 1985
- Lingenfelser D.J. “SAE Cast Metals Task Group Participant, Cast Aluminum Progress Report” April 1985
- Wickberg A Gustafsson G. Larson L.E. “Microstructural Effects on the Fatigue Properties of a Cast Al7SiMg Alloy” SAE Technical Paper No. 840121 1984
- “Constant-Amplitude Low-Cycle Fatigue Testing” 1984 Annual Book of ASTM Standards 03.01
- “Statistical Analysis of Linear or Linearized σ-Life and ε-Life Fatigue Data 1984 Annual Book of ASTM Standards 03.01
- SAE Technical Report J1099 “Technical Report on Fatigue Properties” 1986 SAE Handbook 3.62