National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
An experimental investigation of yield surfaces anisotropies
Štefan, Jan ; Parma, Slavomír ; Marek, René ; Plešek, Jiří ; Feigenbaum, H. P. ; Ciocanel, C.
This contribution is dedicated to a rigorous experimental procedure for evaluation of yield surfaces of common metallic materials. This yield surface tracing procedure employs thin-walled tubular specimens to identify individual yield points of the material under arbitrary combinations of axial load and torque. A yield point is identified on the basis of a prescribed threshold for the effective plastic strain that is being continuously and fully automatically evaluated throughout the test. The experimental results generated with this tracing method are promising, leading to shapes of the yield surfaces conform with the von Mises criterion. The proposed methodology can effectively capture the YS shape.
Experiments in directional distortional hardening—determination of mechanical properties of the S355J0 grade structural steel
Parma, Slavomír ; Ciocanel, C. ; Seiner, Hanuš ; Hrubý, Zbyněk
In order to carry out comprehensive experiments in the research of directional distortional hardening phenomenon, some basic mechanical properties of S355J0 structural steel are determined. Particularly, attention is payed to the determination of elastic properties of the material, determination of anisotropy of the material induced by the manufacturing technology of specimens, and determination of elasto-plastic behavior of the material. Elastic properties of the material are measured via an ultrasound method, elasto-plastic behavior is analyzed from the tensile and torsional testing. Conclusions of the report are intended for design and evaluation of the comprehensive experiments mentioned.

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