PSI- Issue 9

Ivica Čamagić et al. / Procedia Structural Integrity 9 (2018) 279 – 286 Author name / StructuralIntegrity Procedia 00 (2018) 000–000

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6

Table 8. Values of K Ic notched specimens in new PM Specimen mark Testing temperature,  C

Critical J-integral, J Ic , kJ/m 2

Critical stress intensity factor, K Ic , MPa m 1/2

Critical crack length, a c , mm

PM-1-1n PM-1-2n PM-1-3n PM-2-1n PM-2-2n PM-2-3n

60,1 63,9 58,6 43,2 44,7 45,3

117,8 121,4 116,3

38,5 40,8 37,5 40,0 41,4 41,9

20

87,2 88,7 89,2

540

Table 9. Values of K Ic notched specimens in exploited PM Specimen mark Testing temperature,  C

Critical J-integral, J Ic , kJ/m 2

Critical stress intensity factor, K Ic , MPa m 1/2

Critical crack length, a c , mm

PM-1-1e PM-1-2e PM-1-3e PM-2-1e PM-2-2e PM-2-3e

47,8 42,1 40,7 24,5 22,7 21,8

105,0

41,7 36,8 35,6 30,8 28,6 27,4

98,6 96,9 65,6 63,2 61,9

20

540

The characteristic diagrams F-  , and J-  a for specimen taken out from the sample of new PM are given in fig. 7 for specimen marked as PM-1-1n tested at room temperature, and in fig. 8 for specimen marked as PM-2-1n tested at the temperature of 540  C, Čamagić (2013). Diagrams F-  , and J-  a for specimens of exploited PM WM and HAZ from the side of new PM and HAZ from the side of exploited PM, tested at room and working temperature, due to the scope of the paper are not presented, Čamagić (2013). Calculated values of critical stress intensity factor, K Ic , and critical crack length, a c , are given in the tab.10 for notched specimens in WM, tested at room temperature of 20  C and working temperature of 540  C, Čamagić (2013). Calculated values of critical stress intensity factor, K Ic , and critical crack length, a c , are given in the tab. 11 for notched specimens in HAZ from the side of the new PM and in tab. 12 for notched specimens in HAZ from the side of the exploited PM, tested at room temperature of 20  C and working temperature of 540  C, Čamagić (2013).

16

250

PM-1-1n 20 o C

PM-1-1n 20 o C J Ic = 60,1 kJ/m 2

200

12

150

8

100 J, kJ/m 2

F, kN

J Ic

4

50

0

0

0

1

2

3

4

5

6

7

8

0

1

2

3

4

5

6

7

8

 , mm

 a, mm

a)

b)

Fig. 7. Diagrams F-  (a) and J-  a (b) of the specimen PM-1-1n.