Abstract:numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing. Composite Structures, Elsevier, 2018, vol. 193, pp. 121-139. 10.1016/j.compstruct.2018
A B S T R A C TThis work is a contribution to the understanding of the nonlinear shear behaviour caused by cell postbuckling in Nomex honeycomb cores. First, an experimental benchmark study was made of different designs for the shear testing of honeycomb cores. Then, several test specimens were fabricated and tested, a… Show more
“…In this section, the main aspects of the phenomenological description of the honeycomb core presented in [1] are discussed. When the honeycomb structure is subjected to shear loads, the overall nonlinear response of the structure can be explained by two different phenomenological stages: an initial buckling and the final collapse of the cells.…”
Section: Shear Behavior Of Honeycomb Coresmentioning
confidence: 99%
“…This is shown in Figure 2, where the percentage of cells that were about to buckle increases gradually with gamma. These curves were determined in [1] where an Artificial Neural Network (ANN) was developed to detect the collapse of the cells from the data collected by a 3D-DIC that was used to record the experiments. This collapse stage takes place once the cells have buckled due to geometric imperfections, for example, variations in the thickness of the walls or the size and localization of deformations on the wall.…”
Section: Collapse Of the Cellsmentioning
confidence: 99%
“…In [1], it was stated that buckling and collapse of the cells were two different stages. In this work, it is considered that a superposition of the two stages should describe the complete behavior of the honeycomb core for the W and L directions.…”
Section: Modeling Of Shear Nonlinear Behavior Of Hrh-78mentioning
confidence: 99%
“…Nevertheless, recently, a detailed study of the shear behavior of the HRH-78 Nomex honeycomb core was made through experimental and numerical modeling [1]. The authors described the general behavior of the honeycomb core and the shear buckling of the cells and it was proved that the nonlinear response of the honeycomb core and the buckling evolution of the cells were strongly influenced by the boundary conditions.…”
Section: Introductionmentioning
confidence: 99%
“…Considering all the information mentioned above, the purpose of the present research is to provide a simple but accurate strategy for modeling the honeycomb core for the shear case, starting from the observations made in [1] as they are very helpful to understand the general aspects of the structural behavior of hexagonal cells under shear forces.…”
In this work, a modelling strategy based on damage mechanics is presented for Nomex honeycomb core. The proposed approach is based on the experimental analysis presented by the authors in [1] and consists of the decoupled modelling of the buckling and collapse of cells for the HRH-78 Nomex honeycomb core with two damage parameters. The proposed approach shows good agreement with the experimental tests. The computational cost is low, proving the efficacy of this technique. This strategy may avoid using full 3D models that mimic the real shape and is a step toward a full compression/shear nonlinear model for honeycomb core.
“…In this section, the main aspects of the phenomenological description of the honeycomb core presented in [1] are discussed. When the honeycomb structure is subjected to shear loads, the overall nonlinear response of the structure can be explained by two different phenomenological stages: an initial buckling and the final collapse of the cells.…”
Section: Shear Behavior Of Honeycomb Coresmentioning
confidence: 99%
“…This is shown in Figure 2, where the percentage of cells that were about to buckle increases gradually with gamma. These curves were determined in [1] where an Artificial Neural Network (ANN) was developed to detect the collapse of the cells from the data collected by a 3D-DIC that was used to record the experiments. This collapse stage takes place once the cells have buckled due to geometric imperfections, for example, variations in the thickness of the walls or the size and localization of deformations on the wall.…”
Section: Collapse Of the Cellsmentioning
confidence: 99%
“…In [1], it was stated that buckling and collapse of the cells were two different stages. In this work, it is considered that a superposition of the two stages should describe the complete behavior of the honeycomb core for the W and L directions.…”
Section: Modeling Of Shear Nonlinear Behavior Of Hrh-78mentioning
confidence: 99%
“…Nevertheless, recently, a detailed study of the shear behavior of the HRH-78 Nomex honeycomb core was made through experimental and numerical modeling [1]. The authors described the general behavior of the honeycomb core and the shear buckling of the cells and it was proved that the nonlinear response of the honeycomb core and the buckling evolution of the cells were strongly influenced by the boundary conditions.…”
Section: Introductionmentioning
confidence: 99%
“…Considering all the information mentioned above, the purpose of the present research is to provide a simple but accurate strategy for modeling the honeycomb core for the shear case, starting from the observations made in [1] as they are very helpful to understand the general aspects of the structural behavior of hexagonal cells under shear forces.…”
In this work, a modelling strategy based on damage mechanics is presented for Nomex honeycomb core. The proposed approach is based on the experimental analysis presented by the authors in [1] and consists of the decoupled modelling of the buckling and collapse of cells for the HRH-78 Nomex honeycomb core with two damage parameters. The proposed approach shows good agreement with the experimental tests. The computational cost is low, proving the efficacy of this technique. This strategy may avoid using full 3D models that mimic the real shape and is a step toward a full compression/shear nonlinear model for honeycomb core.
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