Local and nonlocal strain gradient approaches for size-dependent plastic deformation

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Ünsal I. E., Günay E., Yalçinkaya T.

26th International ESAFORM Conference on Material Forming, ESAFORM 2023, Krakow, Polonya, 19 - 21 Nisan 2023, cilt.28, ss.1453-1462 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 28
  • Doi Numarası: 10.21741/9781644902479-157
  • Basıldığı Şehir: Krakow
  • Basıldığı Ülke: Polonya
  • Sayfa Sayıları: ss.1453-1462
  • Anahtar Kelimeler: CMSG Theory, Finite Element Method, Size Effect, Strain Gradient Plasticity
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Micro scale manufacturing technologies have been a productive area of research due to the increase in miniaturization in various industries. However, most of the know-how in conventional metal forming processes cannot be readily transferred into micro/meso forming processes due to the size effect. By incorporating the length scale into the formulation, strain gradient theories offer a viable solution to the issues arising from size-dependent complications. This paper aims at implementing a lower-order strain gradient plasticity (SGP) theory developed from the Taylor dislocation model to numerically analyze the impact of the plastic size effect on the forming of metallic materials. The material model together with local and nonlocal approaches for the strain gradient calculations is implemented in a commercial finite element (FE) code through user subroutines. The flat punch indentation problem is examined using the implemented code.