Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Strain Gradient Crystal Plasticity Finite Element Modeling for the Compression Behaviors of Single Crystals

단결정 압축 변형 거동의 변형구배 결정소성 유한요소해석

  • Jung, Jae-Ho (HYUNJIN Materials Co.) ;
  • Cho, Kyung-Mox (School of Materials Science and Engineering, Pusan National University) ;
  • Choi, Yoon Suk (School of Materials Science and Engineering, Pusan National University)
  • 정재호 (현진소재(주)) ;
  • 조경목 (부산대학교 공과대학 재료공학부) ;
  • 최윤석 (부산대학교 공과대학 재료공학부)
  • Received : 2017.09.11
  • Accepted : 2017.11.06
  • Published : 2017.12.27
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Abstract

A strain-gradient crystal plasticity finite element method(SGCP-FEM) was utilized to simulate the compressive deformation behaviors of single-slip, (111)[$10{\bar{1}}$], oriented FCC single-crystal micro-pillars with two different slip-plane inclination angles, $36.3^{\circ}$ and $48.7^{\circ}$, and the simulation results were compared with those from conventional crystal plasticity finite element method(CP-FEM) simulations. For the low slip-plane inclination angle, a macroscopic diagonal shear band formed along the primary slip direction in both the CP- and SGCP-FEM simulations. However, this shear deformation was limited in the SGCP-FEM, mainly due to the increased slip resistance caused by local strain gradients, which also resulted in strain hardening in the simulated flow curves. The development of a secondly active slip system was altered in the SGCP-FEM, compared to the CP-FEM, for the low slip-plane inclination angle. The shear deformation controlled by the SGCP-FEM reduced the overall crystal rotation of the micro-pillar and limited the evolution of the primary slip system, even at 10 % compression.

Keywords

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