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Fatigue analysis-based numerical design of stamping tools made of cast iron

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Abstract

This work concerns stress and fatigue analysis of stamping tools made of cast iron with an essentially pearlitic matrix and containing foundry defects. Our approach consists at first, in coupling the stamping numerical processing simulations and structure analysis in order to improve the tool stiffness geometry for minimizing the stress state and optimizing their fatigue lifetime. The method consists in simulating the stamping process by considering the tool as a perfect rigid body. The estimated contact pressure is then used as boundary condition for FEM structure loading analysis of the tool. The result of this analysis is compared with the critical stress limit depending on the automotive model. The acceptance of this test allows calculating the fatigue lifetime of the critical zone by using the S–N curve of corresponding load ratio. If the prescribed tool life requirements are not satisfied, then the critical region of the tool is redesigned and the whole simulation procedures are reactivated. This method is applied for a cast iron EN-GJS-600-3. The stress-failure (S–N) curves for this material is determined at room temperature under push pull loading with different load ratios R = σ min/σ max = −2, R = −1 and R = 0.1. The effects of the foundry defects are determined by SEM observations of crack initiation sites. Their presence in tested specimens is associated with a reduction of fatigue lifetime by a factor of 2. However, the effect of the load ratio is more important.

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Authors and Affiliations

  1. Université de Toulouse, ICA, Mines Albi, Campus Jarlard, 81013, Albi Cedex 9, France

    K. Ben Slima, L. Penazzi & F. Ronde-Oustau

  2. Université de Toulouse, ICA, ISAE, BP 54032, 31055, Toulouse Cedex 4, France

    C. Mabru

Authors
  1. K. Ben Slima
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  2. L. Penazzi
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  3. C. Mabru
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  4. F. Ronde-Oustau
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Correspondence to C. Mabru.

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Slima, K.B., Penazzi, L., Mabru, C. et al. Fatigue analysis-based numerical design of stamping tools made of cast iron. Int J Adv Manuf Technol 67, 1643–1650 (2013). https://doi.org/10.1007/s00170-012-4597-y

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  • DOI: https://doi.org/10.1007/s00170-012-4597-y

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