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Turtle Shells and Legacy Finite Element Codes: Evolutionary Constraints in the Age of Explainable AI

Mar 18, 2026

This blog post explains why legacy finite element codes are like a turtle’s carapace: a protective structure that provided a survival advantage in the resource-scarce 1960s but now impedes the flexibility needed to meet the demands of explainable AI (XAI). The good news is that the technology required to support XAI already exists.

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“A screening of existent commercial and non-commercial tools was carried out in respect to their fracture mechanics capabilities, their design abilities, implementation as well as their complexity. Although, there are many software possibilities, only those within the reach of the author were evaluated. This resulted in the selection of the commercial tool StressCheck. The assessment of crack propagation on compact tension and two stringer specimens governed by the Paris and Forman regimes was satisfactory compared with experimental results using the material data from simple standard specimens.”

Lloren Llopart Prieto (EADS)
Doctoral Thesis, "Modelling and analysis of crack turning on aeronautical structures"

Scientific Computing

Turtle Shells and Legacy Finite Element Codes: Evolutionary Constraints in the Age of Explainable AI

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Lloren Llopart Prieto (EADS)