Development of Damage Model for Estimation of the Effect of Strain HIstory and Heterogeneous Microstrucure on Ductile Failure

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560132
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Osaka University
• Principal Investigator: OHATA Mitsuru 大阪大学, 工学(系)研究科(研究院), 准教授 (20294027)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 延性 / 成形限界 / 損傷 / 複合組織鋼 / シミュレーション / 歪履歴依存 / 不均質組織

Outline of Final Research Achievements

3D micro-structural FE-model was developed for analyzing the stress/strain localization behaviors by micro-structural strength mismatch. Ductile damage model for reproducing damage evolution up to micro-void/micro-crack formation was also propsed taking the "Baushinger effect" of the materials into account. The combination of the 3D micro-structural FE-model and the proposed numerical damge model was verified to predtic effect of strain history and volume fraction of a second phase of two-phase steel on dcutile fracture limit. This numeriacl simulation was found to correlate micro-structural characteristics with mechanical properties including stress-strain curve and strain history effect on dcutile failure of two-phase steel.

Free Research Field

損傷・破壊力学