PSI - Issue 23

Hugo Wärner et al. / Procedia Structural Integrity 23 (2019) 354–359 Hugo Wärner / Structural Integrity Procedia 00 (2019) 000 – 000

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performed on the fixed OP-specimens. Fig. 5 shows the LAGB calculation areas, as EBSD maps, of the OP-specimens and a clear difference in density of plastic deformation between the fix OP and continuous OP test can be seen. However, the EBSD maps has been reduced in the amount of zero solution, which was applied after the LAGB calculations for better image quality.

Fig. 3. Results from the finite element analysis; a quarter of a cross sectioned specimen is shown. a) The displacement in the z-direction (in m) showing increase in midspan diameter. b) Accumulated plastic strain. Most plastic deformation is carried by the region above the midspan.

Fig. 4. Percent change in midspan diameter during cycling. The diameter increases with cycles. The last point corresponds to the specimen being removed from the test rig (i.e. the displacement boundary conditions were released).

Table 2. Mean fraction of LAGB for OP TMF-cycled pre-aged specimens.

Sanicro 31HT, 1608 cycles

Sanicro 25, 500 FIX

Sanicro 31HT, 500 FIX

Esshete 1250, 500 FIX

Middle (“1”)

20.5%

2,2%

1.3%

7.9%

Waist (“2”)

46,7%

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