Author
A. Derogar
Bio: A. Derogar is an academic researcher from Iran University of Science and Technology. The author has contributed to research in topics: Forming limit diagram & Sheet metal. The author has an hindex of 1, co-authored 1 publications receiving 93 citations.
Papers
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TL;DR: In this article, the effects of process parameters on forming limit diagrams have been evaluated and simulated using ABAQUS/Standard and the simulated results are in good agreement with the experiment.
109 citations
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TL;DR: In this paper, three lightweight alloys, typically utilized in the aircraft and aerospace industries, were formed by supplying a continuous current in order to generate a local heating, which allows a higher formability as compared to cold forming.
169 citations
TL;DR: A fully variational porous plasticity model is modified to include ultrasonic softening effects and then utilized to account for instantaneous softening when ultrasonic energy is applied during deformation.
113 citations
TL;DR: In this article, an overall review of tube hydroforming studies is presented so that other researchers at different parts of the world can use it for further investigations in this area, and a guideline for employing finite element modeling (FEM) in the process analysis is proposed.
97 citations
91 citations
TL;DR: In this article, the authors used a hemispherical dome test with specimens of different widths to determine the forming limit diagram (FLD) for Ti-6Al-4 V alloy at 400°C.
Abstract: Forming limit diagram (FLD) is an important performance index to describe the maximum limit of principal strains that can be sustained by sheet metals till to the onset of localized necking. It is useful tool to access the forming severity of a drawing or stamping processes. In the present work, FLD has been determined experimentally for Ti-6Al-4 V alloy at 400 °C by conducting a hemispherical dome test with specimens of different widths. Additionally, theoretical FLDs have been determined using Marciniak Kuczynski (M-K) model. Various yield criteria namely: Von Mises, Hill 1948, Hill 1993 and Cazacu Barlat in combination with different hardening models viz., Hollomon power law (HPL), Johnson-Cook (JC), modified Johnson-Cook (m-JC), modified Arrhenius (m-Arr.), modified Zerilli–Armstrong (m-ZA) have been used in M-K analysis for theoretical FLD prediction. The material properties required for determination of yield criteria and hardening models constants have been calculated using uniaxial tensile tests. The predicted theoretical FLDs results are compared with experimental FLD. It can be observed that influence of yield criterion in M-K analysis for theoretical FLD prediction is predominant than the hardening model. Based on the results; it is observed that the theoretical FLD using Cazacu Barlat and Hill 1993 yield criteria with m-Arr. hardening model has a very good agreement with experimental FLD.
78 citations