Research Article
Prediction of Progressive Failure Behaviour of Composite Skewed Hypar Shells Using Finite Element Method
Table 6
First ply failure load and ultimate ply failure load.
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Type of lamina |
Failure criteria | First ply failure |
Ultimate Ply Failure Load (UPFL) MPa |
Load for 4 mm deflection where such load is less than FPFL MPa | | Failure load (FPFL) MPa | Failed ply | Failed Gauss point | Failed element |
| | ASCP | Maximum stress | 0.8238 | 1 | 1 | 8 | 180.0550 | 0.1993 | | Hoffman | 0.7714L | 1 | 1 | 8 | 190.4308 | | Tsai-Hill | 0.8177 | 1 | 1 | 8 | 179.0895L | | Tsai-Wu | 0.7722 | 2 | 1 | 8 | 191.8979 |
| | SYCP | Maximum stress | 0.7980 | 1 | 1 | 8 | 265.7825 | 0.1870 | | Hoffman | 0.7244L | 2 | 1 | 8 | 296.7450 | | Tsai-Hill | 0.7922 | 1 | 1 | 8 | 265.3874L | | Tsai-Wu | 0.7249 | 2 | 1 | 8 | 300.7547 |
| | ASAP | Maximum stress | 17.7968 | 2 | 1 | 59 | 499.8536 | | Hoffman | 0.8798 | 1 | 1 | 1 | 495.2707 | | Tsai-Hill | 0.9987 | 1 | 3 | 49 | 509.8078 | | Tsai-Wu | 0.8122L | 1 | 1 | 1 | 493.5450L |
| | SYAP | Maximum stress | 25.6408 | 1 | 1 | 57 | 504.5590 | | Hoffman | 1.3737 | 1 | 4 | 8 | 356.7432 | | Tsai-Hill | 1.5189 | 1 | 1 | 57 | 418.6368 | | Tsai-Wu | 1.2917L | 1 | 4 | 8 | 328.4164L |
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Note: “L” represents the least failure load obtained from the four failure criteria.
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