Nesrine Majed is a Phd in mechanics in national engineering school of Monastir. She obtained a master's degree in mechanics after graduating as a mechatronic engineer from the national engineering school of Sousse in 2010. She is a teacher of mechanics at the Higher Institute of Technical Studies in Kélibia (similar to IUT in France). She has taught several subjects for 13 years. Among these : chracterization and treatment of materials , computer-aided design via solidworks, non destructif testing.
In the presence of casting defects, aluminum components are subjected to multiaxial loadings. The objective of this study is the estimation of the fatigue limit for defective cast aluminum alloy A357 with T6 post heat -treatment. This investigation is based on the analysis of the Crossland equivalent stress in the vicinity of the casting defect using the finite element (FE) method. The defect shape is a semi-spherical void at the surface of a sample submitted to tension fatigue loading. The affected depth of this material is calculated and defined as the depth from the tip of the defect to the interior of the specimen. The Kitagawa-Takahachi diagrams corresponding to different microstructures and two loading ratio R=- 1 and R=0 are simulated based on the affected depth approach. Simulations were compared to the experimental results carried out on the same alloy. The calculations agree well with results inferred from experimental results. Finally, a comparative analysis is carried out between A356 and A357 built on the affected depth approach.
|Thursday 30th November
S08-4 Fatigue and manufacturing process
135 - Fatigue assessment of defective A 357-T6 cast aluminum based on affected depth