PSI - Issue 13

4

Richard J. Williams et al. / Procedia Structural Integrity 13 (2018) 1353–1358 Richard J. Williams et al./ Structural Integrity Procedia 00 (2018) 000–000

1356

2.0

Experimental measurement FE predicted profile

1.5

1.0

0.5

0

0

10

20

30

40

50

Z position (mm)

Fig. 4. Plot of horizontal deflection (in Y) against Z position of the inside cut surface on the vertical cylinder

Good agreement to within 5% can be seen in both models, confirming that the modelling technique can accurately predict component stress fields and distortion. As the horizontal cylinder did not deflect upon slitting, no measurement is shown. 4.2. Stress results The maximum principal stress direction in the components was found to be parallel to the build direction. This is expected as it is consistent with the direction of the highest cooling gradient. For the geometries considered, the stresses in the build direction also relaxed most significantly after the slitting process. To demonstrate the stress profile in the build direction in both horizontal and vertical cylinders, contour plots are shown at the end of the build, before cutting from the build plate and slitting have taken place, in Figs. 5 and 6, respectively.

(MPa)

Fig. 5. Stress in the build direction, or σ yy , stress contours for an isometric view of the YZ plane of the horizontal cylinder, at the end of the build