PSI - Issue 52

Satrio Wicaksono et al. / Procedia Structural Integrity 52 (2024) 438–454 Satrio Wicaksono et al./ Structural Integrity Procedia 00 (2023) 000 – 000

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The variation in the value of k has no effect on the stress-to-strain curve of the PVC material 70.75. However, visually (Table 6), there are differences for k values of 1.1 and 0.5. This is due to the yield strength differences when given axial and hydrostatic compressive loads. Thus, this property is considered as quite critical because it could change the failure mode.

Table 6 Effect of yield strength ratio ( k ) to the failure visualization of the T-joint structure.

0.5

1.1

k

Damage visualization

3.2.2. Variation of displacement at failure parameter in damage evolution Displacement at failure ( disp ) describes the difference between the strain at maximum stress and the strain at the specimen breaks multiplied with the characteristic length. The value of the displacement at failure will determine the damage evolution behavior of the material. Table 7 shows the effect of the value of displacement at failure on the failure morphology of the T-joint. It can be seen that the variation in the value of displacement at failure has a significant effect on the failure morphology of the T-joint. In the case of T-joint, the greater the value of displacement at failure, the foam material is more resistant to core shearing. This property is very critical because the material's resistance to core shearing greatly affects the visualization of T-joint failures.

Table 7 Effect of displacement at failure ( disp ) to the failure visualization of T-joint structure.

Displacement at failure

0.2 mm*

0.9 mm*

Damage visualization

3.3. Variation of AL11050-H14 mechanical properties

3.3.1. Variation of yield strength Based on the test done by Caliskan et al. [14], the yield strength of aluminum is in the range of 100 MPa. Table 8 shows the effect of variations in yield strength on the failure mode of the T-joint. It can be seen that both low (100