Browsing by Subject "strain rate"

Now showing 1 - 4 of 4

Access status: Open Access ,
Effects of strain rate on work hardening of HSLA and Ti-IF steels
(2006) Stefańska-Kądziela, Monika; Majta, Janusz; Muszka, Krzysztof
This study presents some aspects of modeling of the mechanical behavior and strengthening mechanisms of HSLA and Ti-IF steels deformed under high strain rate conditions. Axisymmetrical compression tests at a wide range of strain rates have been performed to determine the mechanical and microstructural response of the material. The experimental data were compared with the results of computer modeling where proposed constitutive models are implemented in FEM code. The test data are used to find suitable values related to Zerilli-Armstrong model for microalloyed steels.
Access status: Open Access ,
Modeling of near-net forging of thin-walled parts of strain rate sensitive alloy
(2005) Bednarek, Sylwia; Sińczak, Jan; Skubisz, Piotr
Numerical modelling of a single-operation forging process of a radial bladed impeller forging as one piece is presented. The analysis have been performed using high-melting-alloy model material. A several alternative technologies differing in temperature and forming speed. Evaluation of the correctness of a forging process were based on distribution of effective strain, effective strain rate, mean stress as well as fllling of the cavities of a die-impression in thin-walled ribs type areas.
Access status: Open Access ,
Numerical modelling of extrusion process in superplastic flow range
(2006) Grzesiak, Jan; Sińczak, Jan; Skubisz, Piotr
The results of numerical modeling of direct and indirect extrusion process of a model alloy of high strain-rate sensitivity at room temperature, Sn38Pb, are presented. The studies were carried out for three values of die angle, three temperatures, four ram speed values, two values of extrusion coefficient and two values of friction factor. Effect of extrusion process parameters on distribution of effective strain, effective strain rate in extruded bar and extrusion load was estimated.
Access status: Open Access ,
The influence of strain rate on microstructure and mechanical behavior of P/M feal
(2008) Śleboda, Tomasz
As part of a broader study of the thermomechanical processing of P/M FeAl alloys, this research is focused on the influence of processing strain rate on the microstructural evolution and mechanical behavior of the processed materials. For the purposes of this study, water atomized FeAl powder was consolidated by hot pressing resulting in fully dense products. The consolidated P/M samples were thermomechanically processed in compression at 800 and 900oC at strain rates of 0.1 s-1 and 10 s-1, to a true strain of 1. The influence of thermomechanical processing parameters on the material flow and microstructural development of investigated alloy was analyzed. Considerable strain rate sensitivity of investigated alloy was observed, specially with reference to microstructural development.