Influence of cell wall curvature radius and adhesive layer on the effective elastic out-of-plane properties of hexagonal honeycombs
Journal Title: INCAS BULLETIN - Year 2018, Vol 10, Issue 4
Abstract
Numerical modeling of honeycomb structures in aerospace engineering is too tedious and time consuming. The homogenization of these structures permits to obtain an equivalent orthotropic homogeneous solid and its elastic effective properties and thus realizing very efficient simulations. In a sandwich structure the most important effective constants of the core are the out-of-plane shear moduli G23 and G13. These particular effective constants can be obtained analytically, numerically or, if available, can be taken from the producer's data sheets. In the last case they are generally obtained experimentally, but only for some particular thicknesses of the cores and sandwich faces. The analytical models usually neglect the curvature radius of the cell walls and the adhesive layer influence by using some additional hypotheses. In this paper a general parameterization of commercial honeycombs is first discussed. Then, neglecting the skin effect and considering the rigid skin effect, the out-of-plane properties of the core are obtained using a finite element analysis of a representative volume element. The numerical results are analyzed by comparing them to the ones given by the existing analytical models and/or experimental data and their advantages and pitfalls are discussed and explained. The results provide new insights into understanding the mechanics of honeycombs.
Authors and Affiliations
Stefan SOROHAN, Dan Mihai CONSTANTINESCU, Marin SANDU, Adriana Georgeta SANDU
Keywords
Related Articles
- EP ID EP419702
- DOI 10.13111/2066-8201.2018.10.4.14
- Views 73
- Downloads 0
Automation and Systems Issues in Air Traffic Control
This paper is dedicated to the study and analysis of a successfully designed control system in ATM. The aircraft's motion is affected by other factors, besides the pilot controls in the form of external disturbances, suc...
Helicopter Roll-Axis Instabilities induced by Pilot Cyclic Control: A Physical Explanation
The main objective of this paper is to give a basic understanding of the mechanisms through which pilot cyclic inputs in lateral cyclic interacts with high-order rotor dynamics destabilizing the helicopter roll motion. T...
Intelligent control of HVAC systems.Part II: perceptron performance analysis
This is the second part of a paper on intelligent type control of Heating, Ventilating, and Air-Conditioning (HVAC) systems. The whole study proposes a unified approach in the design of intelligent control for such syste...
Large caliber blood vessel pseudoaneurysm following prosthetic surgery. Mathematical model and numerical considerations
Using a non-Newtonian mathematical model for the blood flow and a generalized Maxwell model for the viscoelastic behavior of the large vessels – elaborated and presented already by us in previous papers [1], [2] we make...
Nanostructured zirconia layers as thermal barrier coatings
The coatings obtained by thermal spray are used both as antioxidant and connection materials (e.g. MCrAlY type alloys) as well as thermal barrier coatings (e.g. partially stabilized zirconia oxide with yttria oxide). Thi...