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Forming limit prediction using a self-consistent crystal plasticity framework: a case study for body-centered cubic
Youngung Jeong1,2, Minh-Son Pham1,3, Mark Iadicola1
1NIST Center for Automotive Lightweighting, National Institute of Standards and Technology, Gaithersburg, MD, USA.
Modelling and Simulation in Materials Science and Engineering
|June 16, 2021
Summary
Crystallographic texture significantly impacts the formability of BCC materials, influencing forming limit diagrams. The study found that the r-value, while related to forming limit stress, is not a reliable predictor of forming limit strain.
Area of Science:
- Materials Science
- Mechanical Engineering
- Computational Modeling
Background:
- Anisotropy in BCC materials affects their formability.
- Crystallographic texture plays a crucial role in material behavior during deformation.
Purpose of the Study:
- To investigate the influence of crystallographic texture on the forming limits of BCC materials.
- To develop and utilize an efficient computational model for analyzing forming limits.
Main Methods:
- Incorporation of a rate-dependent self-consistent crystal plasticity model with the Marciniak-Kuczyński model.
- Parallel computation significantly improved simulation speed (24x).
- Simulation of various BCC textures including gamma, sigma, alpha, eta, epsilon fibers, and random texture.
Main Results:
- Crystallographic texture has a significant impact on forming limit diagrams, with both positive and negative effects observed.
- The gamma fiber texture showed varied forming limits depending on the strain path (highest in balanced biaxial, lowest in plane strain).
- The r-value does not reliably predict forming limit strain but correlates with forming limit stress.
Conclusions:
- The developed VPSC-FLD model provides a comprehensive tool for studying texture effects on formability.
- Forming limit diagrams are highly sensitive to crystallographic texture in BCC materials.
- Relying solely on the r-value for predicting formability can be misleading.
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