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Cisaillage à grande vitesse : des essais à la simulation

Abstract : To increase their productivity, blanking professionals are interested by an emerging process: the high speed blanking. For this process, the punch speed reaches10m/s whereas this speed does not exceed 0,1m/s for conventional blanking process. However, even if the quality of the obtained surfaces is close to those obtained with fine blanking, the occurence of hard dynamic phenomena makes difficult the deployment of the high speed blanking process. This work proposes to better control this process using experimentations and numerical simulations. An instrumented device has been designed to observe in detail the existing phenomenon during cutting. This device is similar to the industrial one. It includes a punch with non-constant sections and a matrix linked to an Hopkinson's tube in order to measure the blanking cutting forces. This measure requires a specific treatment to correct dynamic effects present in the matrix during the cutting. This treatment, which uses a calibration of the device, was validated thanks to a one-dimensional numerical model. Many observations made on the blanked surfaces have shown that adiabatic shear bands (ASB) can take place. A thermo-mechanical constitutive model (Johnson-Cook's law) of the C40 steel has been identified and used into simulations to reproduce real experimentations. The used simulation is based on a C-NEM approach (Constrained Natural Element Method). A comparative study between simulation and experimental results has been done. Results show a good correlation with experimental tests.
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Contributor : Camille Gaudilliere Connect in order to contact the contributor
Submitted on : Wednesday, February 1, 2012 - 4:45:16 PM
Last modification on : Wednesday, September 28, 2022 - 6:00:45 AM
Long-term archiving on: : Wednesday, May 2, 2012 - 2:40:26 AM


  • HAL Id : pastel-00665330, version 1


Camille Gaudilliere. Cisaillage à grande vitesse : des essais à la simulation. Mécanique []. Arts et Métiers ParisTech, 2011. Français. ⟨NNT : 2011ENAM0052⟩. ⟨pastel-00665330⟩



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