Examination of intrinsic and extrinsic size effect in thin specimens through crystal plasticity frameworks

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Günay E., Bulut O., Yalçinkaya T.

26th International ESAFORM Conference on Material Forming, ESAFORM 2023, Krakow, Poland, 19 - 21 April 2023, vol.28, pp.1471-1480 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 28
  • Doi Number: 10.21741/9781644902479-159
  • City: Krakow
  • Country: Poland
  • Page Numbers: pp.1471-1480
  • Keywords: Crystal Plasticity, Size Effect, t/d Ratio Influence
  • Middle East Technical University Affiliated: Yes


Manufacturing devices at the microscale requires a precise analysis for desirable mechanical behavior. As the products of microscale forming operations have a comparable thickness dimension with grain size, the ratio between thickness and grain size (t/d) becomes an important aspect of mechanical behavior. A number of experimental studies investigated this phenomenon and have shown the influence of the t/d ratio in micron-sized sheet specimens. On the other hand, the computational studies addressing this phenomenon employing micromechanics-based models are quite restricted. The current study aims to investigate the t/d ratio effect through finite element method (FEM) simulations with both local and nonlocal crystal plasticity frameworks. The numerical analyses with the local crystal plasticity framework are obtained by utilizing two different methodologies, where the initial slip resistance is taken as constant or modified using a subroutine based on grain size effects and slip system interactions (see [1]).