The Nomex honeycomb core has been widely used in many industrial fields, especially the aircraft and aerospace industries, due to its high strength stiffness heaviness ratio. Machining of structure is usually associated with tearing walls, deformations cells appearance burrs. Therefore, milling represents an hurdle challenge for scientists researchers about quality machined surface integrity cu...

Hexagonal honeycomb structures are known for their high strength and low weight. We construct a new class of fractal-appearing cellular metamaterials by replacing each three-edge vertex of a base hexagonal network with a smaller hexagon and iterating this process. The mechanical properties of the structure after different orders of the iteration are optimized. We find that the optimal structure...

This paper gives a proof of the classical honeycomb conjecture: any partition of the plane into regions of equal area has perimeter at least that of the regular hexagonal honeycomb tiling.

A detailed account of the crystal-growth technique and real structure effects of the first 3D weak topological insulator Bi14Rh3I9 = [(Bi4Rh)3I][BiI4]2 is given. As recently shown, this compound features decorated-honeycomb [(Bi4Rh)3I] 2+ sheets with topologically protected electronic edge-states and thereby constitutes a new topological class. Meticulous optimization of the synthesis protocol,...

Highway and roadside safety features are crash tested for compliance with certain safety criteria. US Federal Highway Administration (FHWA) uses a surrogate reusable test vehicle, Bogie, to conduct crash tests of roadside safety features. Bogie is intended to replace an impacting vehicle in order to reduce the cost of the test. Bogie can be configured with different crushable impact noses repre...

In this paper, a hybrid structural finite element (FE) acoustic wave based (WB) approach is formulated to avoid using extra acoustic FE in the case of a simple structural geometry but with complicated structural material properties. Following the formulation, the approach is implemented and validated. First, linear hexahedral solid elements with a selective reduced integration are implemented i...

This paper describes an analytical study that was performed as part of the development of an externally deployable energy absorber (DEA) concept. The concept consists of a composite honeycomb structure that can be stowed until needed to provide energy attenuation during a crash event, much like an external airbag system. One goal of the DEA development project was to generate a robust and relia...

A new honeycomb battery package structure is designed in this study. It’s a honeycomb structure but using a grid to reinforce its strength. It can not only satisfy the requirements of strength but also reduce the mass of battery package. To obtain the highly accurate finite element (FE) model, the material parameters of 18650 cylindrical Li-ion battery are identified by using optimization techn...

In this paper an analytic method is used to solve for the cross spectral density of the interior acoustic response of a cylinder with nonuniform thickness subjected to turbulent boundary layer excitation. The cylinder is of honeycomb core construction with the thickness of the core material expressed as a cosine series in the circumferential direction. The coe cients of this series are used as ...

Due to the need for alternative materials realization of lightweight structures, analysis sandwich structures that have a semi-open thermoplastic honeycomb core as an internal support structure is great technical and scientific interest. Sandwich components with honeycomb-structured layer between two continuous fiber-reinforced face sheets exhibit maximum weight-specific stiffnesses strengths. ...