PSI - Issue 38

Adrian Loghin et al. / Procedia Structural Integrity 38 (2022) 331–341 A. Loghin et al. / Structural Integrity Procedia 00 (2021) 000–000

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Fig. 10: Crack path probabilistic assessment using the verified surrogate model.

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Fig. 11: RUL probabilistic assessment using the verified surrogate model.

provides a solution in less than two seconds. It is important to mention that verification of the surrogate model against deterministic assessments (not part of training set) is an essential requirement. Validation of the overall modeling procedure against experimental measurements needs to be pursued continuously by the damage tolerance community to provide confidence in the methodology when applied at the component or structure level.

3. Conclusions

An RBF fatigue crack growth surrogate model was developed based on three-dimensional finite element modeling procedures. The surrogate model is specific to an edge crack in a flat panel containing a hole for which experimental measurements are publicly available. Each 3D FE simulation that was used to train the surrogate model computes crack propagation path and corresponding loading cycles for di ff erent o ff -nominal geometry configurations. Once the surrogate model passes verification requirements, runtime e ffi cient and accurate probabilistic damage tolerance assessments can be performed considering experimental fatigue crack growth rate scatter. The surrogate modeling procedure can be extended to a generic geometry containing an edge crack since the remeshing technique-based 3D FE modeling procedure can accommodate any CAD representation.