PSI - Issue 27

Aditya Rio Prabowo et al. / Procedia Structural Integrity 27 (2020) 171–178 Prabowo et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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structure and the striking ship as a rigid body. Plastic-kinematics material is considered into analyses, and material properties for the nonlinear analysis are shown in Table 3. The proposed materials are taken from different classes of steel classification. 6. Calculation of energy dissipation The calculations on energies using the finite element approach are presented in this section. The dissipated energy based on the collision region is shown in Fig. 3a for the fore-end structure and Fig. 3b for the middle structure. The observation on the side damage will be presented in Fig 6 for the damage on the fore-end structure while Fig. 4 for the middle structure. The characteristics of dissipation energy for each material class will be presented in Fig. 5.

8

12

Loc. 2: 7.5506 MJ

Location 1 - Frame 117 Location 2 - Frame 119

Loc. 3: 10.6742 MJ

Location 3 - Frame 102 Location 4 - Frame 104

Loc. 1: 7.0377 MJ

Loc. 4: 10.2672 MJ

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9

4

6

Difference in the midship: 6.7928%; Fore-end vs. Midship: 34.0686%

Difference in the fore-end: 3.8129%; Fore-end vs. Midship: 34.0686%

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3

Collision Energy (MJ) Dissipated Energy (MJ)

Collision Energy (MJ) Dissipated Energy (MJ)

0

0

0.0

0.5

1.0

1.5

2.0

0.0

0.5

1.0

1.5

2.0

Displacement (m)

Displacement (m)

(a) (b) Fig. 3. Energy dissipation during ship collisions: (a) fore-end structure; and (b) middle structure.

Displacement – Y axis (m)

Displacement – X axis (m)

Displacement – Y axis (m)

Displacement – X axis (m)

(a)

Displacement – X axis (m)

Displacement – Y axis (m)

Displacement – Y axis (m)

Displacement – X axis (m)

(b) Fig. 4. Rupture pattern with displacement contours on the fore-end structures: (a) at the Location 1; and (b) at the Location 2.