PSI - Issue 28

Raghu V Prakash et al. / Procedia Structural Integrity 28 (2020) 1629–1636 Prakash et al/ Structural Integrity Procedia 00 (2019) 000–000

1635

7

summary, the cyclic ABI test method is capable of estimating the fatigue failure life response of metallic materials in pristine form or in-service condition.

Table 2 – Fatigue failure life data estimated from cyclic indentation studies on IN 617.

Specimen/Test ID

Max. Compression Load (N)

Failure life from AE sensor

Failure life from COD response

Failure life from Hysteresis area

15-Feb-2020-01 15-Feb-2020-02 19-Feb-2020-02 19-Feb-2020-01 21-Feb-2020-01 21-Feb-2020-02 20-Feb-2020-01

1250 1250 1250 2000 2000 2000 2250

2466 2455 3374 2197 2870 2954 1729

2455 2533 3405 1964 2866 2958 2065

2533 2455 3405 1972 2901 2977 2082

Load versus Failure Cycles ‐ Cyclic Ball Indentation ‐ AET based failure cycles

10000

y = 26930x ‐0,324

1000

Max. Load, N

100

100

1000

10000

Cycles

Fig. 7 – Failure life data for IN 617 identified through AE sensor during testing by cyclic ball indentation test method.

a)

b)

Fig. 8 – SEM images of indentation area which suggests a) presence of slip bands as well as b) secondary cracks.