Deformation and fatigue behaviour of A356-T7 cast aluminium alloys used in high specific power IC engines
Journal article, 2019

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.

Plasticity

Cast aluminium

Cylinder head

Fatigue

Constitutive modelling

A356

Author

Elanghovan Natesan

Chalmers, Industrial and Materials Science, Engineering Materials

Stefan Eriksson

Volvo Cars

Johan Ahlström

Chalmers, Industrial and Materials Science, Engineering Materials

Christer Persson

Chalmers, Industrial and Materials Science, Engineering Materials

Materials

1996-1944 (ISSN)

Vol. 12 18 3033

Development of analysis models for thermomechanical fatigue

Swedish Energy Agency, 2013-10-01 -- 2018-12-31.

Subject Categories

Applied Mechanics

Other Materials Engineering

Vehicle Engineering

DOI

10.3390/ma12183033

More information

Latest update

3/9/2020 3