![]() The most popular subjects include modeling the phenomenon of the loss of stability, modeling the local phenomena that occur during structural deformation, the determination of strength characteristics based on full geometric models and submodels, and observations of the phenomenon of energy absorption by structures modeled as homogeneous, using special constitutive models. Scientific publications dealing with the numerical modeling of honeycomb structures can be divided into several groups, according to the subject covered by the authors. In order to ensure a high-quality representation of the real conditions and the properties of the materials used, the data used in the preparation of the model should be as reliable as possible. Modern tools, such as the finite element method (FEM) used in industry and science, allow for the effective prediction of the effects of dynamic loading, including fast-changing ones such as those that a shock wave from the detonation of an explosive may have on protective structures. In addition, there are a number of aspects that, if simplified, may make it impossible to effectively predict a honeycomb’s structural behavior, such as the air trapped inside the cells. However, in, the authors show that the strength of the structure can increase by up to 50% with dynamic loading. ![]() This feature has made it possible to derive a mathematical model that enables the calculation of the so-called average value of crushing stress (plateau) to the core (occurring from the moment of stability loss to the beginning of the increase in force due to the structure’s densification) on the basis of the known, basic values characterizing honeycomb structures, such as the yield point of the core material, the wall thickness, and the cell size. Moreover, they have predictable progressive folding (stress–strain) characteristics in the case of static loading. Sandwich structures with honeycomb cores are commonly used because of their high stiffness-to-weight ratio. Due to this feature, honeycomb structures are used across a wide range of industries, including the automotive industry and the military. ![]() NASA and others concluded that the honeycomb structure has the best energy-absorbing properties in relation to its specific mass. For example, they were used in the initial period of space exploration, specifically in the Apollo 11 project, to build elements of the crew and technical compartments. As a result, we were able to attain a high level of accuracy regarding the stress values across the entire range of progressive failure, from the loss of stability to full core densification, and across a wide range of strain rates.įunctional, cell-oriented structures, including honeycombs, have a long history of successful application. In addition, we considered the influence of increases in pressure and the leakage of the air entrapped in the honeycomb cells. The obtained description of the material properties was used in the subsequent creation of a homogeneous model. Results with a good level of agreement between the full core model and the Y element were achieved. In the present study, we proposed and verified a method of numerically modeling honeycomb materials using a simplified Y element. Applying such materials in the construction of large machinery, such as military vehicles, requires the development of a new method of finite element modeling, one that considers conditions with high strain rates, because a material model is currently lacking in the available simulation software, including LS-DYNA. Notes:Test data obtained at 0.625" thickness Size available on request The above values are not guaranteed and should be used as indication only.Aluminum honeycomb structures are used in the construction of protective materials due to the positive relationship between their mass and their energy-absorbing properties. Technical Specification: Mechanical Properties Of Aluminum Honeycomb Core ![]() In addition, hollow honeycomb core materials can also greatly reduce the thermal expansion of the sandwich panels.īesides used in composite panels, bare core can be used in air filter and as grids in front of spotlights and photographic equipment, energy absorber etc.Īluminum honeycomb core sheet can be customized into format includes block, unexpanded slices, expanded sheets, perforated or non-perforated and drilled honeycomb core. It makes the panel uniform strength and ensures panels keep high flatness over a large area. Aluminum honeycomb core has a hexagonal honeycomb structure like so many connected I-beams to disperse the pressure from panel.
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