Damaged material - Structural Integrity

Abstract

Residual stress mitigation in directed energy deposited functionally graded materials:
    Various manufacturing techniques are continuously enhanced to accommodate sustainable throughput of functionally graded materials (FGMs) with long-term strength and stability against harsh operating environments. Among all, the so-called directed energy deposition (DED), which is a fusion-based process, is gaining considerable attention for its unique capabilities to produce metal-based FGMs, as well-documented in the literature. Nevertheless, transformative adoption of DED-built FGM structures in industry still requires reliable design approaches (prior to fabrication) to mitigate the spatially nonuniform temperature field developed during manufacturing and therefore the associated residual stress evolution due to transitions in composition within these structures. The second part of the presentation concerns my efforts while discovering novel deposition strategies by employing nonlinear optimal control paradigm in the design phase that allows an efficient workflow to the best material composition transition with limited distortions, while keeping high process design flexibility.

Exploitation of the concept of configurational forces to develop failure theories to nonlinear elastic damaged material:
    The analysis of the state of damage in materials containing locally distributed defects has been attracting considerable attention for their correct application and optimization. In particular, the development of effective multiscale bridging parameter that connects randomly distributed cracks, voids or pores and macroscopic damage variable, such as the effective elastic modulus reduction, is still a challenging problem. The third and last part of the presentation will deal with the concept of material configurational force as novel descriptor of the content and evolution of defects localized in nonlinear elastic damaged materials.

Le vendredi 29 mai 2026 à 11h00 / Amphithéâtre François Canac, LMA

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