PSI - Issue 5

Yoichi Kayamori et al. / Procedia Structural Integrity 5 (2017) 279–285 Yoichi Kayamori et al. / Structural Integrity Procedia 00 (2017) 000 – 000

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3.2. CTOD obtained by the design curve proposed in this study

m need to be set for calculating  in Eqs.(9a) and (9b), but appropriate m was not clear for the newly formulated design curve. Therefore, m in Eqs.(9a) and (9b) was firstly calculated by substituting  and  obtained by FEA. Figure 1 shows the relationships between m and  /  y for the various values of  /  y c , and Fig.2 shows the relationships between m and  /  y c for the various values of  /  y . . m was not constant, but was particularly affected by Y/T .

Fig. 1 Relationship between the dimensionless constraint factor, m , and the local strain ratio,  /  y ..

Fig. 2 Relationship between the dimensionless constraint factor, m , and the non-dimensional CTOD,  /  y c .