Details

Autor(en) / Beteiligte

• Azadi, Mohammad
• Samiee, Mahdi
• Mohammadi Esfarjani, Sattar

Titel

Estimation of Low-Cycle Fatigue Lifetime in Aluminum-Silicon-Magnesium Alloy of Cylinder Heads based on Striation Marks as Failure Features of Fracture Surfaces and Paris Crack Growth Law

Ist Teil von

• Journal of failure analysis and prevention, 2021-08, Vol.21 (4), p.1466-1475

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• One of the ways to identify the type of failures and to estimate the lifetime of components is to examine the fracture surface by fractographic analysis. The application of this investigation can be introduced in the prediction of the fatigue lifetime of the vehicle parts, aircraft and marine components, and all other structures that are under cyclic loading. In this study, fracture properties of the aluminum-silicon-magnesium alloy, under strain-controlled low-cycle fatigue loading, were studied considering striations on the fracture surface. This material has been widely used in engine cylinder heads. For this purpose, at the first step, relations and formulations were extracted, including the Paris crack growth law and the distance of the fracture surface striations. After measuring striation spacing from the experimental data of the low-cycle fatigue test for aluminum alloys (with and without heat treatment), the material constants of the Paris law were calculated and calibrated. The obtained results of the lifetime estimation, as compared to the experimental fatigue lifetime, stated that the scatter-band was 1.4X, which indicated the accuracy of the proposed model with an average error of 15%.