The flatwise compressive properties of Nomex honeycomb core with debonding imperfections in the double cell wall

2015 ◽  
Vol 76 ◽  
pp. 122-132 ◽  
Author(s):  
Longquan Liu ◽  
Peng Meng ◽  
Hai Wang ◽  
Zhongwei Guan
Keyword(s):  
Cell Wall ◽  
Honeycomb Core ◽  
Compressive Properties ◽  
Nomex Honeycomb

Numerical Analysis and Mechanical Properties of Nomex™ Honeycomb Core

2017 ◽  
Author(s):  
Yue Liu ◽  
Weicheng Gao ◽  
Wei Liu ◽  
Zhou Hua
Keyword(s):  
Compressive Strength ◽  
Cell Walls ◽  
Mechanical Response ◽  
Compressive Loading ◽  
Fe Model ◽  
Honeycomb Core ◽  
Practical Applications ◽  
Honeycomb Sandwich ◽  
Nomex Honeycomb ◽  
Strength And Stiffness

This paper presents an investigation on the mechanical response of the Nomex honeycomb core subjected to flatwise compressive loading. Thin plate elastic in-plane compressive buckling theory is used to analyze the Nomex honeycomb core cell wall. A mesoscopic finite element (FE) model of honeycomb sandwich structure with the Nomex honeycomb cell walls is established by employing ABAQUS/Explicit shell elements. The compressive strength and compressive stiffness of Nomex honeycomb core with different heights and thickness of cell walls, i.e. double cell walls and single cell walls, are analyzed numerically using the FE model. Flatwise compressive tests are also carried out on bare honeycomb cores to validate the numerical method. The results suggest that the compressive strength and compression stiffness are related to the geometric dimensions of the honeycomb core. The Nomex honeycomb core with a height of 6 mm has a higher strength than that of 8 mm. In addition, the honeycomb core with lower height possesses stronger anti-instability ability, including the compressive strength and stiffness. The proposed mesoscopic model can effectively simulate the crushing process of Nomex honeycomb core and accurately predict the strength and stiffness of honeycomb sandwich panels. Our work is instructive to the practical applications in engineering.

Quasi-Static Failure Analysis of Honeycomb Sandwich Beam with Composite Facesheets

2010 ◽  
Vol 160-162 ◽  
pp. 855-859 ◽  
Author(s):  
Li Qing Meng ◽  
Yan Wu ◽  
Shi Zhe Chen ◽  
Xue Feng Shu
Keyword(s):  
Sandwich Beam ◽  
Indentation Test ◽  
Core Material ◽  
Honeycomb Core ◽  
Three Point Bending ◽  
Composite Sandwich ◽  
Sandwich Construction ◽  
Honeycomb Sandwich ◽  
Nomex Honeycomb ◽  
Static Failure

Sandwich construction consists of two thin composite or metal facesheets separated by a core material. Despite extensive researches on the sandwich constructions, their mechanical properties and failure behaviours are still not fully understand. The objective of the paper is to use a experimental and theoretical predicting failure mode for sandwich beam consisting of GFRP facesheets and Nomex honeycomb core. Two kinds of composite sandwich beams are observed in quasi-static three-point bending and indentation test.

Mechanical responses of a composite sandwich structure with Nomex honeycomb core

2019 ◽  
Vol 38 (13) ◽  
pp. 601-615 ◽  
Author(s):  
Yue Liu ◽  
Wei Liu ◽  
Weicheng Gao ◽  
Limeng Zhang ◽  
Enjie Zhang
Keyword(s):  
Sandwich Structure ◽  
Honeycomb Core ◽  
Mechanical Responses ◽  
Composite Sandwich ◽  
Nomex Honeycomb

scholarly journals Flatwise Compressive Properties of Kenaf/Polypropylene Honeycomb Core

2018 ◽  
Vol 370 ◽  
pp. 012031
Author(s):  
Nabihah Sallih ◽  
Peter Lescher ◽  
Debes Bhattacharyya
Keyword(s):  
Honeycomb Core ◽  
Compressive Properties

The Study of Resonant Frequency of Horn and Circular Tool of Ultrasonic Milling System

2014 ◽  
Vol 628 ◽  
pp. 283-286
Author(s):  
Yun Dian Zhang ◽  
Zhong Qiu Ma
Keyword(s):  
Resonant Frequency ◽  
Analytic Method ◽  
Test Results ◽  
Honeycomb Core ◽  
Design Requirement ◽  
Network Method ◽  
Ultrasonic Milling ◽  
Nomex Honeycomb ◽  
Transition Type ◽  
Ansys Workbench

Based on the traditional analytic method and four-end network method, a tapered transition-type ultrasonic horn is designed and analyzed by ANSYS Workbench software. The composite horn avoids the limitations of single-horn and the resonant frequency of the horn is good to meet the design requirement. Through the ANSYS Workbench , the circular tool used for cutting the Nomex honeycomb core materials is analyzed. The test results shows that the resonant frequency of the circular tool is too small to meet the design requirement when the tool have a good modes. But after the optimize design by the Six Sigma in ANSYS Workbench, the resonant frequency of the tool is good for meeting the demands of the design and production and processing.

Design Optimization of Honeycomb Core Sandwich Panels for Maximum Sound Transmission Loss

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Rohan Galgalikar ◽  
Lonny L. Thompson
Keyword(s):  
Cell Wall ◽  
Sandwich Panel ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Geometric Parameters ◽  
Constant Mass ◽  
Honeycomb Core ◽  
Wall Angle ◽  
Unit Cells ◽  
Interior Cell

This study focuses on sound transmission frequency response through honeycomb core sandwich panels with in-plane orientation. Specifically, an optimization technique has been presented to determine the honeycomb unit cell geometric parameters that maximize the sound transmission loss (STL) through a sandwich panel, while maintaining constraints of constant mass and overall dimensions of panel length and height. The vibration characteristics and STL response of a sandwich panel are parameterized in terms of four honeycomb unit cell independent geometric parameters; two side lengths, cell wall thickness, and interior cell wall angle. With constraints of constant mass and overall dimensions, relationships are determined such that the number of independent variables needed to define the honeycomb cell and panel geometry is reduced to three; the integer number of unit cells in the longitudinal direction of the core, number of unit cells in the height direction, and interior cell wall angle. The optimization procedure is implemented by linking a structural acoustic finite-element (FE) model of the panel, with modefrontier, a general purpose optimization software. Optimum designs are obtained in representative frequency ranges within the resonance region of the STL response. Optimized honeycomb geometric solutions show at least 20% increase in STL response compared to standard hexagonal honeycomb core panels. It is found that the STL response is not only affected by the cell wall angle, but strongly depends also on the number of unit cells in the horizontal and vertical direction.

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