A 3D FE Modeling of Machining Process of Nomex® Honeycomb Core: Influence of the Cell Structure Behaviour and Specific Tool Geometry

Jaafar, Mohamed; Atlati, Samir; Makich, Hamid; Nouari, Mohammed; Moufki, Abdelhadi; Jullière, Benjamin

doi:10.1016/j.procir.2017.03.255

Cited by 65 publications

(30 citation statements)

References 19 publications

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“…N is short for Nomex honeycomb, where the number after N indicates the height of honeycomb. In bending test specimens, the face sheet bears in-plane tension, compression, and in-plane shear stress, and the core material mainly bears transverse shear stress [30][31][32], which is evenly distributed along the thickness. Therefore, the thickness of the basalt fiber and the height of Nomex honeycomb are taken into consideration.…”

Section: Preparation Of Bending Specimensmentioning

confidence: 99%

Experimental Study on Mechanical Properties of the Sandwich Composite Structure Reinforced by Basalt Fiber and Nomex Honeycomb

2020

Materials

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The new sandwich composite structure formed by basalt fiber resin-based sheets and Nomex honeycomb has the advantages of being lightweight and environmentally friendly, as well as having excellent electromagnetic performance. It has very important application prospects in traditional and emerging fields. In this paper, the mechanical properties of this new sandwich composite structure are studied. The results show that, under the condition of flatwise compression, increasing the height of the honeycomb is conducive to improving the compressive capacity of the structure. However, the height should be controlled within a certain range in case of instability and yield of the honeycomb; under the bending conditions, the bending failure mode of the composite structure has gone through five stages. Owing to the honeycomb manufacturing process, the orientation of the honeycomb also has a great influence on the bending strength of the structure. After further analysis, it is found that basalt fiber sheets contribute the most to the bending stiffness of the structure, and the main role of honeycomb is to provide out-of-plane support. In both cases, the failure of specimens is ductile, and the combined structure still has a small amount of bearing capacity and maintains structural integrity. Research on this new type of composite structural material is very beneficial for promoting the application and development of green and lightweight special functional materials.

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Section: Preparation Of Bending Specimensmentioning

confidence: 99%

Experimental Study on Mechanical Properties of the Sandwich Composite Structure Reinforced by Basalt Fiber and Nomex Honeycomb

2020

Materials

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“…4) related to its composite nature and the cutting conditions. Moreover, the alveolar geometry of the structure causes vibrations on the different components of the cutting effort [10] which increase the defects.…”

Section: Description Of the Experiments 21 Workpiece Materials And Toolsmentioning

confidence: 99%

Milling diagnosis using artificial intelligence approaches

Knittel

Makich

Nouari

2019

Mechanics & Industry

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The Industry 4.0 framework needs new intelligent approaches. Thus, the manufacturing industries more and more pay close attention to artificial intelligence (AI). For example, smart monitoring and diagnosis, real time evaluation and optimization of the whole production and raw materials management can be improved by using machine learning and big data tools. An accurate milling process implies a high quality of the obtained material surface (roughness, flatness). With the involvement of AI-based algorithms, milling process is expected to be more accurate during complex operations. In this work, a milling diagnosis using AI approaches has been developed for composite sandwich structures based on honeycomb core. The use of such material has grown considerably in recent years, especially in the aeronautic, aerospace, sporting and automotive industries. But the precise milling of such material presents many difficulties. The objective of this work is to develop a data-driven industrial surface quality diagnosis for the milling of honeycomb material, by using supervised machine learning methods. In this approach cutting forces are online measured in order to predict the resulting surface flatness. The developed diagnosis tool can also be applied to the milling of other materials (metal, polymer, etc.).

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“…In this respect, several failure criteria, including Hashin [ 30 ], Tsai-Wu [ 31 ], Tsai-Hill [ 32 ], and Sun [ 33 ], are of particular interest for an HC core made of unidirectional fiber-reinforced polymer papers. Jaafer et al [ 34 ] employed Hashin failure criteria to model the fracture and optimize the cutting parameters in the machining process of the polymeric Nomex HC core. Yang et al [ 35 ] used Tsai-Hill theory to investigate the strength of glass and carbon fiber-reinforced composite plates subjected to tensile and compressive load.…”

Section: Introductionmentioning

confidence: 99%

Representative Cell Analysis for Damage-Based Failure Model of Polymer Hexagonal Honeycomb Structure under the Out-of-Plane Loadings

et al. 2020

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The honeycomb (HC) core of sandwich structures undergoes flexural loading and carries the normal compression and shear. The mechanical properties and deformation response of the core need to be established for the design requirements. In this respect, this article describes the development of the smallest possible representative cell (RC) models for quantifying the deformation and failure process of the Nomex polymer-based hexagonal HC core structure under the out-of-plane quasi-static loadings. While the hexagonal single and multi-cell models are suitable for the tension and compression, a six-cell model is the simplest RC model developed for shear in the transverse and ribbon direction. Hashin’s matrix and fiber damage equations are employed in simulating the failure process of the orthotropic cell walls, using the finite element (FE) analysis. The FE-calculated load–displacement curves are validated with the comparable measured responses throughout the loading to failure. The location of the fracture plane of the critical cell wall in the out-of-plane tension case is well predicted. The wrinkling of the cell walls, leading to the structural buckling of the HC core specimen in the compression test, compares well with the observed failure mechanisms. In addition, the observed localized buckling of the cell wall by the induced compressive stress during the out-of-plane shear in both the transverse and ribbon direction is explained. The mesoscale RC models of the polymer hexagonal HC core structure have adequately demonstrated the ability to predict the mechanics of deformation and the mechanisms of failure.

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A 3D FE Modeling of Machining Process of Nomex® Honeycomb Core: Influence of the Cell Structure Behaviour and Specific Tool Geometry

Cited by 65 publications

References 19 publications

Experimental Study on Mechanical Properties of the Sandwich Composite Structure Reinforced by Basalt Fiber and Nomex Honeycomb

Experimental Study on Mechanical Properties of the Sandwich Composite Structure Reinforced by Basalt Fiber and Nomex Honeycomb

Milling diagnosis using artificial intelligence approaches

Representative Cell Analysis for Damage-Based Failure Model of Polymer Hexagonal Honeycomb Structure under the Out-of-Plane Loadings

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