Yazar "Ozturk, F" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Analysis of forming limits using ductile fracture criteria
    (ELSEVIER SCIENCE SA, 2004) Ozturk, F; Lee, D
    The application of the ductile fracture criteria for the prediction of the forming limit diagram (FLD) of sheet metal was investigated. The limit strains for the FLD were determined by substituting stress and strain values obtained front the finite element Simulation of out-of-plane formability test into the ductile fracture criterion. Fracture predictions for the left side of the FLD were quite Successful. However, the predictions were not Successful for the right side of the FLD. It is concluded that the ductile fracture criteria could not be used directly to predict the FLD. New or modified form of the ductile fracture criteria should be explored. As an additional test the limit strains for the FLD were determined at 20, 25, 30, 35, 40, and 45% thickness strains from the finite element simulations of out-of-plane formability experiment. The predicted FLD curves were compared against the experimental and analytical curves. The shapes of the curves at left side of the FLD were found to be in accord with the experimental and analytical curves, but they did not agree at the right side of the FLD. (C) 2004 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Experimental and numerical analysis of out-of-plane formability test
    (ELSEVIER SCIENCE SA, 2005) Ozturk, F; Lee, D
    Out-of-plane (dome) formability test is used extensively to determine forming limit diagrams (FLDs) of sheet metals. Strain paths are generated to form the FLD using this test. In this research, a comparative study was performed between measured and predicted strain paths. Numerical predictions are well suited with the experimental results. The strain paths from finite element simulations are found fairly acceptable to represent both sides of the FLD. The effects of mesh size and lubrication conditions on the forming limit diagram were also investigated. (c) 2005 Elsevier B.V. All rights reserved.