Multiaxial fatigue of cast aluminium EN AC-42000 T6 (G-AlSi7Mg0.3 T6) for automotive safety components under constant and variable amplitude loading
Regarding the fatigue behaviour of EN AC-42000 T6 (A 356 T6), which is the most frequently used cast aluminium alloy for automotive safety components, especially under non-proportional constant and variable normal and shear stress amplitudes with changing principal stress directions, a poor level...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-07-01
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| Series: | Frattura ed Integrità Strutturale |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_26.pdf |
| Summary: | Regarding the fatigue behaviour of EN AC-42000 T6 (A 356 T6), which is the most frequently
used cast aluminium alloy for automotive safety components, especially under non-proportional constant and
variable normal and shear stress amplitudes with changing principal stress directions, a poor level of knowledge
was available. The reported investigations show that, under non-proportional normal and shear stresses, fatigue
life is increased in contrast to ductile steels where life is reduced due to changing principal stress directions. This
behaviour caused by the low ductility of this alloy (e < 10%) compared to quenched and tempered steels
suggests the application of the Normal (Principal) Stress Hypothesis (NSH). For all of the investigated stress
states under multiaxial constant and variable (Gaussian spectrum) amplitudes without and with mean stresses,
the NSH was able to depict the life increase by the non-proportionality and delivered, for most cases,
conservative but non-exaggerated results. |
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| ISSN: | 1971-8993 1971-8993 |