| Autor: |
Johannes Dallmeier, Klaus Eigenfeld, Otto Huber, Andreas Hilbig, Holger Saage |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Materials Science and Engineering: A. 590:44-53 |
| ISSN: |
0921-5093 |
| Popis: |
Extruded ME21 (nominal thickness 1.5 mm) and twin roll cast AZ31 sheet metals (nominal thickness 1.2 mm) are investigated via quasi-static tensile and compressive tests and cyclic stress and strain controlled fatigue tests at ambient temperature. Both materials show a strong basal texture with the c -axis being almost normal to the sheet plane in AZ31 and tilted about 20° from the normal towards the extrusion direction in ME21. Furthermore, a direction dependence of the tensile strength values is observed. The difference in tensile yield strength comparing the extrusion (rolling) to the transverse direction is about 10% in AZ31 and 25% in ME21. In compression the quasi-static stress–strain curves show negligible differences in extrusion (rolling) and transverse direction up to 10% total strain. ME21 shows comparatively low tangent modulus and pseudoelastic behavior at low stresses. Sigmoidal shape of hysteresis loops starts to appear at strain amplitudes >0.4% in both materials. The cyclic stress–strain curve is approximated by the Ramberg–Osgood equation using different parameters for tension and compression. The strain-life curve is described by the Basquin equation and the bilinear Manson–Coffin approach. In addition, the evolution of mean stress, stress amplitude, and Masing behavior are analyzed and strain- and stress-life curves of both materials are compared and discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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