Misorientation and grain boundary orientation dependent grain boundary response in polycrystalline plasticity

YALÇINKAYA T., ÖZDEMİR İ., TANDOĞAN İ. T.

COMPUTATIONAL MECHANICS, cilt.67, sa.3, ss.937-954, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67 Sayı: 3
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1007/s00466-021-01972-z
  • Dergi Adı: COMPUTATIONAL MECHANICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Compendex, INSPEC, MathSciNet, zbMATH, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.937-954
  • Anahtar Kelimeler: Strain gradient plasticity, Microforming, Size effect, Grain boundary, Crystal plasticity, GRADIENT CRYSTAL PLASTICITY, SINGLE-CRYSTAL, DISLOCATION DENSITY, DEFORMATION, MODEL, LOCALIZATION, ACCOUNTS, SCALE, SLIP, MICROSTRUCTURE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

This paper studies the evolution of intergranular localization and stress concentration in three dimensional micron sized specimens through the Gurtin grain boundary model (J Mech Phys Solids 56:640-662, 2008) incorporated into a three dimensional higher-order strain gradient crystal plasticity framework (Yalcinkaya et al. in Int J Solids Struct 49:2625-2636, 2012). The study addresses continuum scale dislocation-grain boundary interactions where the effect of crystal orientation mismatch and grain boundary orientation are taken into account through the grain boundary model in polycrystalline metallic specimens. Due to the higher-order nature of the model, a mixed finite element formulation is used to discretize the problem in which both displacements and plastic slips are considered as primary variables. For the treatment of grain boundaries within the solution algorithm, an interface element is formulated and implemented together with the bulk plasticity model. The capabilities of the framework is demonstrated through 3D polycrystalline examples considering grain boundary conditions, grain boundary strength, the orientation distribution and the specimen size. A detailed grain boundary condition and stress concentration analysis is presented. The advantages and the disadvantages of the model is discussed in detail through numerical examples.