In a previous work a numerical tool was presented which accurately predicted both process force and fracture initiation for blanking of a ferritic stainless steel in various blanking geometries. This approach was based on the finite element method, employing a rate-independent elasto-plastic constitutive model combined with a fracture criterion which accounts for the complete loading history. In the present investigation this work is extended with respect to rate-dependence by employing an elasto-viscoplastic constitutive model in combination with the previously postulated fracture criterion for ferritic stainless steel. Numerical predictions are compared to experimental data over a large range of process speeds. The rate-dependence of the process force is significant and accurately captured by the numerical simulations at speeds ranging from 0.001 to 10 mm/s. Both experiments and numerical simulations show no influence of punch velocity on fracture initiation.
Experimental and Numerical Investigation on the Influence of Process Speed on the Blanking Process
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received March 2000; Revised May 2001. Associate Editor: K. Stelson.
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Goijaerts , A. M., Govaert, L. E., and Baaijens, F. P. T. (April 29, 2002). "Experimental and Numerical Investigation on the Influence of Process Speed on the Blanking Process ." ASME. J. Manuf. Sci. Eng. May 2002; 124(2): 416–419. https://doi.org/10.1115/1.1445152
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