Abstract
To prevent any failure or fracture in materials during a forming process, the study of material workability is a crucial task. In this paper, the workability of two different aluminium alloys was described through Cockcroft - Latham ductile fracture criteria and forming limit diagrams. Moreover, the experiments have been carried out using compression tests and finite element methods and there was able to compare and verify the physical and numerical approaches. According to the results, there was found out that physical and numerical models are advantageous tools to describe the material workability during forming processes and the optimal data are obtained when both approaches are working together.
Highlights
Aluminium alloys provide some advantageous properties which make them attractive for many industrial applications
As there is well known that the forming limit of metals strongly depends on stress and strain, ductile fracture criteria as a Freudenthal, Cockcroft - Latham (CL), Brozzo, McClintock, Oyane type [2,3,4,5,6] have been successfully used to the numerical description of material workability with focus on stress and strain
According to the compressive stress-strain curves (Fig. 2), there is obvious that both materials show high ductility, EN AW 7075 provides higher strength than EN AW 6082
Summary
Aluminium alloys provide some advantageous properties which make them attractive for many industrial applications. Within aluminium alloys forming processes, there is very important whether deformation can be carried out in safe conditions, means without any failure or fracture of the processed material (workability). As there is well known that the forming limit of metals strongly depends on stress and strain, ductile fracture criteria as a Freudenthal, Cockcroft - Latham (CL), Brozzo, McClintock, Oyane type [2,3,4,5,6] have been successfully used to the numerical description (expression) of material workability with focus on stress and strain. Great stress and strain are being developed during the processing through severe plastic deformation (SPD) methods which have been nowadays successfully used to refining the material internal structure to the submicrometer range (ultrafine-grained structure). Ultrafinegrained (UFG) materials provide improved properties in comparison to their counterparts (processed by classical methods) [7,8,9,10,11] sufficient emphasis on the material workability during SPD processing has to be ensured
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