PSI - Issue 12

Lorenzo Bergonzi et al. / Procedia Structural Integrity 12 (2018) 392–403 Lorenzo Bergonzi / Structural Integrity Procedia 00 (2018) 000 – 000

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397

(a)

(b)

Figure 5. Middle section (a) and end of transition radius (b) stress values compared with the one obtained from standard specimen at the same locations.

W R [mm] [mm] [mm] G

Geometry

ASTM D-638 Type I

13 13

57 57

76 52

Equivalent

Figure 6. Dimension specifications of the equivalent specimen

(a)

(b)

Figure 7. (a) Plot of stress distribution (  xx ) in function of distance from specimen axis in correspondence of the end of the radius and at the middle section evaluated at element centroid (b) Contour of stress (  xx ) on the gage length for the two geometries.

3. Fixture geometry In order to speed up fixture design, a process for iteratively optimize specimen shape and fixture together has not been implemented, but an attempt was made to identify a fixture seat that doesn’t significantly influence the stress state of the previously determined specimen. The alignment is guaranteed by an adjustable mounting system placed