PSI - Issue 2_A

Dong-Jun Kim et al. / Procedia Structural Integrity 2 (2016) 825–831 Dong-Jun Kim et al. / Structural Integrity Procedia 00 (2016) 000–000

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Fig. 1. (a) True stress-strain curve of P91 at 600ºC; (b) Comparison of FE simulation results with smooth bar creep tests.

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Fig. 2. (a) Experimental load line displacement and (b) crack growth curve for P91.

3. Plastic-creep damage model for finite element simulations 3.1. Creep damage model based on the creep strain The damage model was based on the ductility exhaustion model. Incremental damage was defined by the ratio of incremental creep strain, c   , and multi-axial creep ductility,   * f c  :     * c c f c       (1) The model by Rice and Tracey (1969) was used to quantify the stress triaxiality effect on creep ductility.