Effect of plastic strain and ductile damage on elastic modulus of multiphase steel and its impact on springback prediction

Sebastian Münstermann*, Yannik Sparrer, Yuan Yao, Junhe Lian, Rickmer Meya, Till Clausmeyer, A. Erman Tekkaya

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2 Citations (Scopus)

Abstract

The springback behavior of cold formable steel of grade DP 1000 is assessed experimentally and numerically. Bending tests according to the VDA test specification are interrupted at three characteristic roller displacements, and the unloading characteristics are investigated. The tests are simulated with four different material models: i.) elastic plastic simulation with constant elastic modulus, ii.) elastic plastic simulation with plastic strain-dependent elastic modulus, iii.) damage mechanics simulation with constant elastic modulus, iv.) damage mechanics simulation with plastic strain-dependent elastic modulus. To provide the required input data for these simulations, the effect of plastic strain on the elastic modulus is studied based on uniaxial tensile tests, whereas the possible effect of ductile damage evolution on springback properties is numerically captured by the modified Bai-Wierzbicki model. The studies reveal that consideration of plastic strain effects on the elastic modulus adds a significant amount of accuracy to the numerical simulations, whereas the consideration of ductile damage does not improve the simulation results as much. This observation has to be related to the fact that steel DP 1000 is characterized by late damage initiation with rapid subsequent damage accumulation.

Original languageEnglish
Title of host publicationProceedings of the 22nd International ESAFORM Conference on Material Forming, ESAFORM 2019
EditorsPedro Arrazola, Eneko Saenz de Argandona, Nagore Otegi, Joseba Mendiguren, Mikel Saez de Buruaga, Aitor Madariaga, Lander Galdos
PublisherAmerican Institute of Physics
ISBN (Electronic)9780735418479
DOIs
Publication statusPublished - 2 Jul 2019
MoE publication typeA4 Article in a conference publication
EventInternational ESAFORM Conference on Material Forming - Vitoria-Gasteiz, Spain
Duration: 8 May 201910 May 2019
Conference number: 22

Publication series

NameAIP Conference Proceedings
Volume2113
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational ESAFORM Conference on Material Forming
Abbreviated titleESAFORM
CountrySpain
CityVitoria-Gasteiz
Period08/05/201910/05/2019

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