PSI - Issue 33

Muhammad Sabiqulkhair Akbar et al. / Procedia Structural Integrity 33 (2021) 67–74 Akbar et al. / Structural Integrity Procedia 00 (2019) 000–000

72

6

(c) Fig. 4. (a) Strain of the ELT ratio 7; (b) strain of the ELT ratio 8; (c) strain of the ELT ratio 9.

0 0,2 0,4 0,6 0,8 1 1,2 1,4

Strain Ratio

5

6

7

8

9 10 11

ELT Ratio

Fig. 5. Convergence study based on strain ratio of the FE analysis.

3.3. Stress ratio The stress (von-Mises) ratio is obtained from the stress analysis value divided by stress benchmark value, all the simulation results presented in Table 6. The stress ratio of the first variation midship simulation is 1.423. In the second variation, the stress ratio is 1.177. In the third variation, the stress ratio is 1.019. The fourth variation of the simulation has a stress ratio is 0.933. The fifth variation has a stress ratio of 0.863. The sixth variation has a stress ratio of 0.778. In the last variation, the stress ratio is 0.647. An illustration of the stress contours on the model is presented in Fig. 6.

Table 6. Stress ratio of the midship structure. ELT Ratios Nodes

σ v-M (MPa)

Benchmark σ v-M (MPa)

σ v-M Ratio

Elements

5 6 7 8 9

138521 93057 74016 56612 46044 36946 28757

70667 47686 38009 29184 23890 19191 15065

203.4 168.2 145.7 133.4 123.3 111.2

142.9 142.9 142.9 142.9 142.9 142.9 142.9

1.423 1.177 1.019 0.933 0.863 0.778 0.647

10 11

92.4