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3 Engineering Transactions

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Strain hardening under non-proportional loading in polycrystalline aluminum alloys

Osipiuk W., Łukaszewicz K.

Engineering Transactions

2008

Vol. 56, iss. 4

311-324

In the paper it is postulated that the so-called common slip domains influence the character of the strain hardening phenomena for complex loading paths. The slip domains were evaluated on the basis of the Batdorf- Budiansky slip theory of plasticity. Evolution of a yield surface for different non-proportional tension-torsion loading paths was determined for PA 4 aluminum alloy and the hypothesis that the strain hardening depends on the development of the common slip domains was shown to be justified.

Yield surfaces and criteria of plastic yielding for a strain hardening material. P. 1 : Experimental study

Miastkowski J., Szczebiot R.

Engineering Transactions

2001

Vol.49, iss.1

89-98

The paper presents the results of experimental investigations of yield surfaces and plastic yield criteria for an aluminium alloy under complex loading. Experiments were performed on flat specimens (cut out of a sheet of metal) under uniaxial tension or compression. The proposed methodology has allowed to determine simultaneously two characteristic sections of the yield load surfaces. The first of these sections lies in the region of tensile stress while the second one is within the compressive stress area. Then, these two sections have enabled us to describe the position and dimensions of the whole yield surface in the stress space. Tests were carried out at first in the initial state and then in three other states of this material obtained under different plastic prestrains. Such a procedure allowed us to determine the quantitative changes in the yield surfaces dimensions and the position of their centres as a function of plastic prestrains.

Yield surfaces and criteria of plastic yielding for a strain hardening material. P. 2 : Theoretical analysis

Miastkowski J., Szczebiot R.

Engineering Transactions

2001

Vol.49, iss.1

99-108

The paper presents the experimental verification of the generalized Mróz hardening hypothesis under the conditions of complex state of stress. The analysis performed takes into account the changes in size and position in the stress space of the triaxial ellipsoid illustrating the Huber-Mises-Hencky yield condition for the plane state of stress under definite plastic strains.