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Article

Deformation and Fatigue Behaviour of A356-T7 Cast Aluminium Alloys Used in High Specific Power IC Engines

1
Department of Industrial and Materials Science, Chalmers University of Technology, 412 96 Göteborg, Sweden
2
Volvo Car Corporation, Analysis and Verification, 405 31 Göteborg, Sweden
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 3033; https://doi.org/10.3390/ma12183033
Received: 13 August 2019 / Revised: 13 September 2019 / Accepted: 15 September 2019 / Published: 18 September 2019
(This article belongs to the Section Materials Simulation and Design)
The continuous drive towards higher specific power and lower displacement engines in recent years place increasingly higher loads on the internal combustion engine materials. This necessitates a more robust collection of reliable material data for computational fatigue life prediction to develop reliable engines and reduce developmental costs. Monotonic tensile testing and cyclic stress and strain-controlled testing of A356-T7 + 0.5 wt.% Cu cast aluminium alloys have been performed. The uniaxial tests were performed on polished test bars extracted from highly loaded areas of cast cylinder heads. The monotonic deformation tests indicate that the material has an elastic-plastic monotonic response with plastic hardening. The strain controlled uniaxial low cycle fatigue tests were run at multiple load levels to capture the cyclic deformation behaviour and the corresponding fatigue lives. The equivalent stress-controlled fatigue tests were performed to study the influence of the loading mode on the cyclic deformation and fatigue lives. The two types of tests exhibit similar fatigue lives and stress-strain responses indicating minimal influence of the mode of loading in fatigue testing of A356 + T7 alloys. The material exhibits a non-linear deformation behaviour with a mixed isotropic and kinematic hardening behaviour that saturates after the initial few cycles. There exists significant scatter in the tested replicas for both monotonic and cyclic loading. View Full-Text
Keywords: cylinder head; cast aluminium; A356; constitutive modelling; fatigue; plasticity cylinder head; cast aluminium; A356; constitutive modelling; fatigue; plasticity
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MDPI and ACS Style

Natesan, E.; Eriksson, S.; Ahlström, J.; Persson, C. Deformation and Fatigue Behaviour of A356-T7 Cast Aluminium Alloys Used in High Specific Power IC Engines. Materials 2019, 12, 3033. https://doi.org/10.3390/ma12183033

AMA Style

Natesan E, Eriksson S, Ahlström J, Persson C. Deformation and Fatigue Behaviour of A356-T7 Cast Aluminium Alloys Used in High Specific Power IC Engines. Materials. 2019; 12(18):3033. https://doi.org/10.3390/ma12183033

Chicago/Turabian Style

Natesan, Elanghovan, Stefan Eriksson, Johan Ahlström, and Christer Persson. 2019. "Deformation and Fatigue Behaviour of A356-T7 Cast Aluminium Alloys Used in High Specific Power IC Engines" Materials 12, no. 18: 3033. https://doi.org/10.3390/ma12183033

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