PSI - Issue 66

Jinta Arakawa et al. / Procedia Structural Integrity 66 (2024) 38–48 Author name / Structural Integrity Procedia 00 (2025) 000–000

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Table. 2. Parameters for CP-FEM.

Elastic matrix components (GPa) 140 c 11 128 c 12 50 c 44 Initial value of CRSS g ( α ) (MPa) 313 {110}<111>

Pan-Rice shear strain increment

Strain rate sensitivity m Reference slip rate

Hardening modulus k (MPa)

50

n value

0.2

(

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)

(

(101)

-20MPa 120MPa

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(110)

(011)

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Fig. 10. Analysis results of CP-FEM ( ε =0.16 [%] ).

3.3 CP-FEM analysis results Since it is imperative to consider a mechanical model of a polycrystalline body to predict fatigue crack initiation sites, it was employed crystal plasticity finite element (CP-FEM) analysis, which accounts for the interaction of slip activities among slip systems and grains. The crystal plasticity analysis model is shown in Fig . 9 . An analytical model was constructed by assigning the Euler angle values of the inverse pole figure map observed via EBSD to each grain, enabling the analytical determination of the resolved shear stresses (RSS) acting on the {110}<111> system. Also, The analytical model assigned the Euler angles obtained from EBSD to each crystal grain and replicated the structure