Dual-interface model for twinning in the coupled crystal plasticity finite element – Phase field method. (November 2022)

• Record Type: Journal Article
• Authors: Mo, Hanxuan; Liu, Guisen; Mao, Yong; Shen, Yao; Wang, Jian
• Is Part Of: International journal of plasticity. Volume 158(2022)
• Publication Date: 2022-11
• Subjects: Twinning -- Interface -- Finite element method -- Phase field -- Mesh sensitivity; Plasticity -- Periodicals; Plasticité -- Périodiques; Plasticity; Periodicals; 620.11233
• DOI: 10.1016/j.ijplas.2022.103441
• Languages: English
• ISSNs: 0749-6419

Abstract

Highlights: A dual-interface model is developed in the framework of coupled CPFE-PF method to efficiently solve the mechanical fields and explicitly simulate the evolution of twin domain. The dual-interface model accommodates both constrained-sharp interface in FE method and refined-diffuse interface in PF method. The constrained-sharp interface in FE method can mimic the physically sharp interface by confining the thickness of twin/parent interface to only one layer of transition element. The refine-diffuse interface in PF method constructed from constrained-sharp interface by multi-classifier neural-network fitting can remove jaggies on interface and stress field while maintaining low thickness of interface. The CPFE-PF method implemented with dual-interface model can obtain the mesh insensitive twin evolution and stress-strain responses during deformation. Abstract: Crystallographic shear transformation banding such as deformation twinning and martensitic transformation accommodates plastic deformation and generates new domain with different orientation or phase in matrix. The evolution of a new domain is described by the migration of interfaces separating the domain from the matrix. A coupled crystal plasticity finite element (CPFE) – phase field (PF) method is thus developed to simulate the migration of interfaces and plastic deformation. We propose a dual-interface model that integrates the constrained-sharp interface in FE method to solve the deformation fields, and the refined-diffuse interface in PF method to solve the domain evolution. The constrained-sharp interface in FE consists of one transition element between matrix and new domain. The refined-diffuse interface is locally extracted from the constrained-sharp interface by multi-classifier neural network fitting. Such a smoothing technique rubs off the jaggies of the constrained-sharp interface by a smooth function and thus diminishes mesh sensitivity of interface. Finally, we implemented the dual-interface model into the coupled CPFE-PF method and demonstrated the capability of diminishing mesh sensitivity in modelling deformation twinning. Graphical abstract: Image, graphical abstract