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Influence of flow stress accuracy on the results of metal forming processes
Author(s) -
Kopp Reiner,
Souza Mauro Moraes,
Rogall ClausMichael
Publication year - 1988
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198800269
Subject(s) - finite element method , flow stress , stress (linguistics) , physics , materials science , mechanical engineering , structural engineering , composite material , strain rate , engineering , thermodynamics , philosophy , linguistics
During the determination of flow stress measuring errors in the range of ± 10% may easily occur. These measuring errors are transmitted to a greater or lesser extent to the FEM analysis. An evaluation of the influence of stress‐strain curve errors in the FEM calculation of forming processes and its results was made using the ABAQUS programme package for the simulation of the rolling process and using the FINEL programme package for the simulation of the upsetting process. Both programmes describe force and equivalent stress with the same accuracy as the stress‐strain curve does. Lateral and longitudinal flow behaviour appears relatively insensitive to measuring errors in the determination in the stress‐strain curve, as does local strain. Attention should be payed, however, to the calculation of individual stress components. In these cases the errors may be compounded during the calculation.