Abstract
A thermal-mechanical fatigue criterion is proposed to assess the lifetime of aluminium alloys produced by a lost foam casting process. It is based on the observed size distribution of pores sizes which are considered as critical zones for cracks initiation and gives reliable results when both pores sizes are identified from X-ray tomography and mean stresses are taken into account. Lifetime probabilities are finally successfully compared with experimental results.
Highlights
Nowadays, car engines tend to be exposed to very high temperature and pressure during their nominal use, to improve their performance and to reduce their environmental impact
Car engines tend to be exposed to very high temperature and pressure during their nominal use, to improve their performance and to reduce their environmental impact. This trend requires the use of new materials or new processes for avoiding thermal-mechanical fatigue (TMF) damage in cylinder heads that are subjected to increasing temperatures and stresses
This study focuses essentially on the materials obtained by Lost Foam Casting (LFC) process which has a great impact on the microstructure of the materials as it was already illustrated in [1]
Summary
Car engines tend to be exposed to very high temperature and pressure during their nominal use, to improve their performance and to reduce their environmental impact. This trend requires the use of new materials or new processes for avoiding thermal-mechanical fatigue (TMF) damage in cylinder heads that are subjected to increasing temperatures and stresses. Its main drawback lies in the presence of more numerous pores and intermetallics, defects that can help to initiate TMF cracks.
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