Nahiene Hamila
Centre national de la recherche scientifique
Composite numberBending stiffnessFinite element methodForming processesHyperelastic materialComposite materialTextileMacroViscoelasticityMaterials scienceConstitutive equationThermoformingWoven fabricShell (structure)ThermoplasticTextile compositeComputer simulationStructural engineeringReinforcementBendingShear (geology)
101Publications
20H-index
1,583Citations
Publications 99
Newest
#1Jin Huang (University of Lyon)H-Index: 1
#2Philippe Boisse (University of Lyon)H-Index: 49
Last. Nahiene Hamila (CNRS: Centre national de la recherche scientifique)H-Index: 20
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Abstract Tufting of preforms increases the resistance of the laminated composites to delamination. Draping of the preforms is clearly modified by the presence of tufting threads. A simulation approach for the forming of tufted textile reinforcement stacks is proposed. It determines the state of the tufted preforms after forming and in particular the possible wrinkles. The layers of textile reinforcements are modeled by stress resultant shells. Tufting threads are modeled by rod chains that can s...
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#1Jin HuangH-Index: 1
#2Nahiene HamilaH-Index: 20
Last. Philippe BoisseH-Index: 49
view all 3 authors...
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#1Jie WangH-Index: 1
#2Peng WangH-Index: 22
Last. Philippe BoisseH-Index: 49
view all 4 authors...
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#1Jin Huang (University of Lyon)H-Index: 1
#2Philippe Boisse (University of Lyon)H-Index: 49
Last. Peng Wang (University of Upper Alsace)H-Index: 22
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Abstract Draping of composite textile reinforcements on a square box was analyzed experimentally and by numerical simulation. This forming is difficult for fabrics with continuous fibers due to the quasi inextensibility of the fibers. It is shown that the feasibility of draping on a square box with a large depth depends on the weave pattern of the textile reinforcement. Simultaneous forming of several plies without defects is also obtained. A simulation approach based on stress resultant shell f...
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#1Jie Wang (University of Lyon)H-Index: 1
#2Peng WangH-Index: 22
Last. Philippe Boisse (University of Lyon)H-Index: 49
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Abstract Mesoscopic analyses of textile composite reinforcements consider each yarn as a deformable solid in contact with its neighbours. They provide the internal architecture of the deformed woven fabric that conditions the permeability of the reinforcement and the mechanical characteristics of the cured woven composite. With regard to preform draping, simulations are generally carried out on a macroscopic scale because mesoscopic analyses of the forming process have a computational cost which...
2 CitationsSource
#1Yvan Denis (University of Lyon)H-Index: 4
#2Fabrice Morestin (University of Lyon)H-Index: 17
Last. Nahiene Hamila (University of Lyon)H-Index: 20
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Abstract Deep drawing complex composite parts including strong geometrical non-linearities are currently of major interest. Such forming process induces non-monotonous variations in bending and in-plane shear deformation modes. Moreover, it is experimentally shown that these specific variations lead to an hysteretic behavior of the material. Hence, non dissipative models are no longer appropriate to accurately describe the behaviour since these variations of load cannot longer be neglected. The ...
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#1Jin Huang (University of Lyon)H-Index: 1
#2Philippe Boisse (University of Lyon)H-Index: 6
Last. Yingdan Zhu (CAS: Chinese Academy of Sciences)H-Index: 12
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When a thick laminate is subjected to bending, under certain boundary conditions, wrinkles may appear and develop due to the inextensibility of the fibers. Wrinkling is one of the most critical defects in composite manufacturing. Numerical simulation of the onset and growth of such wrinkles is an important tool for defining optimal process parameters. Herein, several bending experiments of thick laminates are presented. They were found to lead to severe wrinkling and delamination of different ki...
5 CitationsSource
In this paper we present a low-order solid-shell element formulation—having only displacement degrees of freedom (DOFs), i.e., without rotational DOFs. The element has an additional middle node, that allows efficient and accurate analyses of shell structures using elements at extremely high aspect ratio. The formulation is based on the Hu–Washizu variational principle leading to a novel enhancing strain and stress tensor that renders the computation particularly efficient, with improved in-plane...
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#1Jessy Simon (École centrale de Nantes)
#2Nahiene Hamila (University of Lyon)H-Index: 20
Last. Sébastien Comas-Cardona (École centrale de Nantes)H-Index: 17
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Abstract The mechanical efficiency of fiber-reinforced composite materials mainly depends on the alignment of fibers along the load paths arising from the boundary conditions applied to the part. On this basis, the Tailored Fiber Placement (TFP) consists in building a fibrous reinforcement by continuously laying down a tow on a plane backing material which can be a polymer film or a fibrous reinforcement such as woven fabrics or NCF. The tows are maintained in place with the desired orientation ...
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#1Mohamadou Dia (CNRS: Centre national de la recherche scientifique)
#2Anthony Gravouil (University of Lyon)H-Index: 31
Last. Mickael Abbas (CNRS: Centre national de la recherche scientifique)H-Index: 1
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Abstract In most papers with solid-shell finite elements for non-linear calculation of thin structures, only one type of element is presented. Either prismatic solid-shell or hexahedral solid-shell element. However, it is well known that in industrial studies, where complex geometries are involved, it is very difficult to model with only hexahedral type of finite element. We will therefore propose a study where two recently formulated solid-shell finite elements (SB7 and SB9) are combined to sol...
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