PSI - Issue 77

Kumar C. Jois et al. / Procedia Structural Integrity 77 (2026) 405–412 Jois, et al./ Structural Integrity Procedia 00 (2026) 000–000

411

7

(a)

Ideal bond

(b)

Cohesive

Predicted burst region

Hashin Damage

Hashin Damage

(c)

3% void

(d)

6% void

Hashin Damage

Hashin Damage

Fig. 5. Numerical analysis with Hashin damage variable [1].

4. Discussion Using the ideal model, the vessel was designed for a nominal burst pressure of 164.5 MPa, and the corresponding laminate configuration was finalized for numerical assessment. Based on manufacturing insights and prior observations, void accumulation tends to occur in regions where there is a large change in winding angle between adjacent layers. To assess the influence of voids on structural integrity, void models representing different porosity levels were developed and analyzed numerically. The damage variable at the predicted burst region increases with higher void content, indicating a more localized and severe stress concentration. For the model with 6% voids, the predicted burst pressure decreases by approximately 19.7%, resulting in a reduced value of about 132.1 MPa. This highlights the strong sensitivity of burst performance to void content.