Development of a Robust Multiaxial Fatigue Model for A/C Metallic Assemblies in an Industrial Context

• Autorzy: Delpuech Benjamin , Nutte Maxime , Jacques Vincent , Morlet Benoît

Identyfikatory

DOI

10.2478/fas-2024-0008

• Języki publikacji: EN

Abstrakty

EN

In a context of growing importance of mass reduction and reliability of structures towards greener aircrafts, fatigue of metallic materials is a key issue in the structural optimization. The process used by aeronautic industrials to compute the fatigue life is often based on a large empirical experience and meets a need for efficiency in their application, requiring a compromise between accuracy and ease of use. According to legacy crack initiation methodologies, lifetime computation is based on the analysis of elastic stress fields, calculated analytically or by Finite Element Method. Evaluation of lifetime is calibrated on elementary tests, mainly uniaxial, with geometric specificity (bone, hole, notch…). One of the limits of this approach appears when parts are subjected to multi-axial loads. Nowadays, these particular stress states are justified by conservative approaches to ensure flight safety and by tests on full-scale aircrafts. Whether for the operational maintenance or the structural optimization of new aircrafts, it is intended to enhance crack initiation methodologies, taking into account multiaxiality of loads, stress gradient effects, and complex material behaviours. Dassault-Aviation implements a crack initiation lifetime computation based on a local approach. These developments go hand in hand with a PhD (Nutte, 2023) on a multiaxial fatigue criterion in order to predict crack initiation in metallic assemblies. This work was supported by an innovative dedicated test campaign. The identification of material’s parameters is based on uniaxial and multi-axial mechanical tests, specifically designed to calibrate these models. Then, novel geometry of specimen for bolted assemblies, facilitating various biaxial non-proportional loadings, is used to evaluate the methodology. Also, multiaxial fatigue models require a precise assessment of the local mechanical fields to which the structure is subjected. For this, a finite element analysis must be conducted with a level of complexity associated with the level of accuracy targeted. The material constitutive equations used in the finite element analysis are therefore at the heart of these fatigue substantiation approaches. Applications to complex aeronautical structures such as massive 3D parts or assembly by fastener will highlight the benefits and perspectives for this local fatigue approach. It will require the use of multi-scale data science.

Słowa kluczowe

EN

fatigue; local; junction; multiaxial; test

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2024
• Tom: Iss.16
• Strony: 102--118
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr., wzory

Twórcy

autor

Delpuech Benjamin

• DASSAULT AVIATION, 54 Avenue Marcel Dassault, 33700 Mérignac, France

• https://orcid.org/0000-0003-1125-2628

autor

Nutte Maxime

• DMAS - ONERA, Université Paris Saclay, 92320 Châtillon, France

• https://orcid.org/0009-0008-5541-6907

autor

Jacques Vincent

• DASSAULT AVIATION, 78, quai Marcel-Dassault, 92500 Saint-Cloud, France

• https://orcid.org/0009-0002-6172-6481

autor

Morlet Benoît

• DASSAULT AVIATION, 78, quai Marcel-Dassault, 92500 Saint-Cloud, France

• https://orcid.org/0009-0005-0566-6391

Bibliografia

• Bron, F., & Besson, J. (2004). A yield function for anisotropic materials Application to aluminum alloys. International Journal of Plasticity, 20(4-5), 937-963. https://doi.org/10.1016/j.ijplas.2003.06.001
• Gonçalves, C. A., Araújo, J. A., & Mamiya, E. N. (2005). Multiaxial fatigue: A stress based criterion for hard metals. International Journal of Fatigue, 27(2), 177-187. https://doi.org/10.1016/j.ijfatigue.2004.05.006
• Goulmy, J. P. (2017). Modélisation de l’impact du grenaillage sur le comportement et l’endommagement en fatigue de l’Inconel 718 [PhD thesis]. Université de Technologie de Troyes.
• Niu, M. C. (1998). Airframe stress analysis and sizing, 2nd ed. Hong Kong Conmilit Press limited.
• Nutte, M. (2003). Modélisation multi-échelle de l’endommagement en fatigue des structures métalliques en aéronautique [PhD thesis]. Université Paris-Saclay. (ONERA) Office national d’études et de recherches aérospatiales Département Matériaux et Structures.
• Nutte, M., Bonnand, V., Delpuech, B., Kanouté, P., & Kruch, S. (2025). Failure analysis of metallic bolted joints under multiaxial fatigue loading. Engineering Failure Analysis, 109347. https://doi.org/10.1016/j.engfailanal.2025.109347
• Pilkey, W. D. (1997). Peterson’s stress concentration factors, 2nd ed. Wiley-lnterscience.

Uwagi

This article was presented at the 32nd Symposium of ICAF https://www.icaf2025.com/