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Youngung Jeong,Timo Manninen 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6
The computational algorithm of a crystal-plastic-based FLD predictive model (VPSC-FLD) developed in Jeong et al. (ModelSimul Mater Sci Eng, 2016. https ://doi.org/10.1088/0965-0393/24/5/05500 5) is enhanced. A real-time monitor process runswhile the forming limit diagram is calculated by parallel computation on various strain loading paths. The monitor processenables the CPU workers to communicate with each other so that the unnecessary model runs can be determined and terminatedon the fly. Moreover, the advanced numerical algorithm suggested earlier by Schwindt et al. (Int J Plast 73:62–99,2015. https ://doi.org/10.1016/j.ijpla s.2015.01.005) is implemented to VPSC-FLD. The new numerical algorithm and realtimemonitor has improved both the overall computational speed and the efficiency in parallel computation. The enhancedVPSC-FLD model is applied for austenitic and ferritic stainless samples in terms of flow stress–strain curve, R-values, andforming limit diagram. The linearization scheme applied on the local constitutive description is studied to reveal its impactson various macroscopic properties. It is found that the linearization scheme with the best fit on uniaxial data is not necessarythe one that gives the best predictive accuracy on the forming limit prediction.