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《第八届全国塑性加工学术年会论文集》 2002年
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TWO METHODOLOGIES FOR THE SIMULATION OF DUCTILE DAMAGE IN SHEET METAL FORMING PROCESSES

Y.Q.Guo  K.Saanouni  A.Cherouat  Y.M.Li  G.Loppin  K.Debray  
【摘要】:正 This paper deals with two different resolution strategies aiming to predict the ductile damage occurrence during the numerical simulation of sheet metal forming processes.The first one is a dynamic explicit incremental approach with a fully coupled elastoplastic-damage model.Based on the thermodynamics of irreversible processes with state variables the fully coupled constitutive equations account for both the isotropic hardening and the ductile damage.They have been implemented into the FE code ABAQUS/Explicit dedicated to the metal forming simulation.For the numerical aspects,an implicit integration scheme is used for local time integration,of the constitutive equations and a dynamic explicit scheme is used to solve global equilibrium equations.The second strategy is a more simple method called the "Inverse Approach" (LA.) with a simplified damage model.The LA.is limited to a simple constitutive law based on the total deformation theory of plasticity accounting for the isotropic hardening and damage.The assumptions of proportional loading and damage saturation after the damage threshold lead to a closed form solution for the damage evolution equation.The numerical implementation of these two damage models is made in such manner that the calculations can be executed with or without damage effect,i.e.coupled or uncoupled calculations.Some examples will show the advantages of each damage model.

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