PSI - Issue 75

Laurent Dastugue et al. / Procedia Structural Integrity 75 (2025) 334–343 Laurent Dastugue et al. / Structural Integrity Procedia (2025)

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be ported. They must be redeveloped to operate under the solver’s numerical and data handling conventions, including memory management, parallel execution, and data locality constraints. This imposes a significant development burden on the solver architecture team. Despite the required development effort, the benefits of full integration are substantial: • Drastically reduced total simulation time • Elimination of data conversion and transfer errors • Reduced disk space requirements • Full exploitation of solver-internal data precision and resolution • Seamless user experience and streamlined workflow integration This approach represents a fundamental shift from tool-based coupling to function-level integration, setting a new standard for fatigue analysis within structural simulation environments. The following chapters demonstrate the benefits for standard fatigue analysis, along with additional improvements. The universality of this groundbreaking integration also makes it well-suited for many extensions. The same advantages demonstrated here also apply to other fatigue models, such as strain-life and LEFM crack growth methods. 4. Additional Improvement – Simplified Material Input In fatigue analysis, the definition of material properties — specifically S-N (stress-life) curves — is an additional input for reliable damage prediction. To address this, a simplified material input has been implemented, based on standardized material modelling in accordance with the FKM Guideline. At the core of the improved methodology is an automated SN-curve generator, which derives fatigue strength curves from minimal material data, fully compliant with the FKM Guideline. Instead of requiring manually defined curves, the user provides only three essential inputs: • FKM Material Group ID (e.g., steels, cast iron, aluminum alloys, see left table of fig. 5) • Ultimate Tensile Strength (Rm) • Yield Strength (Re) Based on this input, a standardized SN-curve is generated automatically using empirical models and regression parameters defined in the FKM framework. 4.1. SN-Curve Generator Based on FKM Guideline

Fig. 5. FKM material group table and local S-N curve.