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Investigation of the deformability of aluminium-copper casting alloys

Winiarski Grzegorz, Dziubińska Anna, Majerski Krzysztof, Szucki Michał, Drozdowski Krzysztof

Advances in Science and Technology. Research Journal

2018

Vol. 12, no 3

242--249

The paper presents the results of a numerical analysis and experimental tests investigating the deformability of castings made of two aluminium alloys: EN AW-2017A and EN AW-2024. Test specimens were produced by two casting methods: sand casting and permanent mould casting. The castings were first subjected to homogenizing annealing; afterwards, they were shaped into cylindrical specimens for an upsetting test. This test was conducted on a hydraulic press in the temperature range of 420500˚C. Visual inspection of the specimens and examination of their microstructure were performed. Hardness of selected specimens was also measured. The study led to determination of the effect of the mould type on the deformability of the castings and the hardness of forgings obtained from these casting. Obtained results also became a basis for determining the forging temperature ranges for casting preforms made of the investigated aluminium alloys.

Application of the formability limit function in prediction of the material fracture

Grosman F., Tkocz M.

Archives of Civil and Mechanical Engineering

2004

Vol. 4, no 3

77-84

The known criteria for predicting the ductile fracture during bulk-metal forming operations and their disadvantages are discussed. Then the authors present their own damage model that is based on the strainpath dependent ductile fracture criterion and the use of a formability limit function. The computation procedure is implemented into the Forge3 finite-element package and tested by performing the simulations of cold upsetting of austenitic-steel cylindrical billet.

Opisano znane z literatury kryteria plastycznego pękania podczas operacji kształtowania objętościowego oraz ich wady. Zaprezentowano własny model zniszczenia oparty na odkształceniowym kryterium plastycznego pękania oraz wykorzystujący funkcję odkształcalności granicznej. Procedura obliczeniowa modelu została wprowadzona do kodu programu Forge3, którego podstawą jest metoda elementów skończonych, a następnie przetestowana przez przeprowadzenie symulacji numerycznych spęczania na zimno wsadu w postaci walca wykonanego ze stali austenitycznej.