| Autor: |
Subrahmanyam, A., Shivaprasad, Ch., Guha, Suman, Raju, D.V., Verma, Rahul K., Reddy, N. Venkata |
| Zdroj: |
Journal of Manufacturing Processes; 20220101, Issue: Preprints |
| Abstrakt: |
Electric pulse aided deformation (EPAD) of metals reduces the flow stress due to both thermal (expansion as well as softening) and electro-plastic (EP) effects. To quantify the electro-plastic effect during pulse application, close prediction of stress-drop due to thermal effects is very important. Testing machine relaxes due to sudden drop in stress at the instant of pulse application and this aspect must be considered in deformation analysis of the predictive methodology to accurately estimate the stress-drop. Coupled electro-thermo-mechanical finite element analysis by incorporating the testing machine stiffness is carried out during the present work to estimate the stress-drop due to thermal effects and validated. Results indicate that the testing machine stiffness significantly influences the stress-drop. In addition, experimental and numerical studies carried out during the present work explain the role of relative rate of deformation and thermal expansion during pulse application to quantify the EP effect. In the present work, cold-rolled and annealed automotive (CMn 440) steel is used and there is a reasonable EP effect. |
| Databáze: |
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| Externí odkaz: |
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