PSI - Issue 38

Frédéric Kihm et al. / Procedia Structural Integrity 38 (2022) 12–29

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Kihm, Miu, Bonato / Structural Integrity Procedia 00 (2021) 000 – 000

We can conclude from this model that the dominant predictor is temperature, which is the source of material thermal expansion. The presence of pressure is statistically significant, but it could be deemed as practically immaterial since its effect on the output is an order of magnitude lower than that of temperature. The presence of acceleration is neither substantial in its expectation nor significant and, therefore, for pragmatic reasons, can be considered to be zero. Our exploration so far has been driven by statistical significance even though we noticed that the reduction in prediction error from adding more parameters to the model is practically negligible. It is worth noting that – without running this data science exercise – the engineer might have overlooked the importance of the temperature. Fatigue and structural failures are typically the results of applied forces and vibrations, leading naturally the engineer to pay more attention to the pression and the acceleration signals.

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