Flexural Properties of Kenaf Sandwich Panel

2012 ◽  
Vol 567 ◽  
pp. 216-219
Author(s):  
Zahurin Halim ◽  
Siti Khadijah Abdul Rahman
Keyword(s):  
Mechanical Properties ◽  
Steel Sheet ◽  
Sandwich Panel ◽  
Core Structure ◽  
Main Element ◽  
Flexural Properties ◽  
Skin Thickness ◽  
The Core ◽  
Galvanised Steel

This study concerns on effect of varying skin thickness to flexural properties of sandwich panel. The main element of the core structure is kenaf and the skin used in this study is galvanised steel sheet. Skin thickness being used in this research is 1.0 mm and 1.2 mm. In this study, comparing sandwich of skin thickness 1.0 mm and 1.2 mm, result shows that 1.0 mm skin is sufficient as mechanical properties of sandwich decreases and density of sandwich increases as skin thickens.

SEM Analysis of Kenaf Sandwich Panel

2015 ◽  
Vol 1115 ◽  
pp. 300-303
Author(s):  
Zahurin Halim ◽  
Maizatulnisa Othman ◽  
Siti Khadijah Abdul Rahman
Keyword(s):  
Steel Sheet ◽  
Sandwich Panel ◽  
Sem Analysis ◽  
Core Structure ◽  
Main Element ◽  
Skin Thickness ◽  
Flexural Test ◽  
Cross Sectional ◽  
The Core ◽  
Galvanised Steel

This study focus on the cross-sectional image of sandwich panel; the kenaf dispersion in core and the skin core interaction. Fracture image is the image outcome of flexural test. The main element of the core structure is kenaf and the skin used in this study is galvanised steel sheet. Skin thickness being used in this research is 1.0 mm and 1.2 mm.

scholarly journals Sandwich Structured Composites for Aeronautics: Methods of Manufacturing Affecting Some Mechanical Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Aneta Krzyżak ◽  
Michał Mazur ◽  
Mateusz Gajewski ◽  
Kazimierz Drozd ◽  
Andrzej Komorek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Polymer Composites ◽  
Impact Load ◽  
Sandwich Panels ◽  
Adhesive Layer ◽  
Core Structure ◽  
Road Vehicles ◽  
The Core ◽  
Press Method

Sandwich panels are composites which consist of two thin laminate outer skins and lightweight (e.g., honeycomb) thick core structure. Owing to the core structure, such composites are distinguished by stiffness. Despite the thickness of the core, sandwich composites are light and have a relatively high flexural strength. These composites have a spatial structure, which affects good thermal insulator properties. Sandwich panels are used in aeronautics, road vehicles, ships, and civil engineering. The mechanical properties of these composites are directly dependent on the properties of sandwich components and method of manufacturing. The paper presents some aspects of technology and its influence on mechanical properties of sandwich structure polymer composites. The sandwiches described in the paper were made by three different methods: hand lay-up, press method, and autoclave use. The samples of sandwiches were tested for failure caused by impact load. Sandwiches prepared in the same way were used for structural analysis of adhesive layer between panels and core. The results of research showed that the method of manufacturing, more precisely the pressure while forming sandwich panels, influences some mechanical properties of sandwich structured polymer composites such as flexural strength, impact strength, and compressive strength.

Geometrical nonlinear thermal response of sandwich panels with temperature dependent mechanical properties—Extended high-order approach

2019 ◽  
Vol 21 (5) ◽  
pp. 1700-1725 ◽  
Author(s):  
Yeoshua Frostig ◽  
George Kardomateas
Keyword(s):  
Mechanical Properties ◽  
Sandwich Panel ◽  
Mechanical Response ◽  
Numerical Study ◽  
Thermal Response ◽  
High Order ◽  
Theory Approach ◽  
Temperature Dependent ◽  
The Core ◽  
Compressive Loads

The thermal and the thermo-mechanical responses of a sandwich panel with a compliant core are investigated within the framework of the extended high-order approach where the core properties are temperature dependent or independent. Loads schemes include thermal field within temperature working range simultaneous with in-plane compressive loads applied to the core only and to the face sheets and core in the form of the uniform end—shortening of edge of panel. The mathematical formulations use the extended high-order sandwich panel theory approach that takes into account the in-plane rigidity of the core and uses the deformation patterns of the high-order sandwich panel theory. The linear and nonlinear field equations along with the appropriate boundary conditions are presented. A numerical study is conducted, and it investigates the thermal response with temperature independent and temperature dependent mechanical properties of the core as well as the thermo-mechanical response due to in-plane compressive loads. The results include displacements, stress resultants, and stress at critical locations along the panel as well as equilibria curves. They reveal that, in general, the panel with temperature independent properties response remains almost linear while with temperature dependent ones it takes a general nonlinear response. The addition of an external mechanical load changes the response from a linear/nonlinear one that may be allowable stress controlled to a case where loss of stability occurs.

Mechanical Properties of Kenaf Core Sandwich Panel Toughened with Modified Epoxy

2015 ◽  
Vol 1115 ◽  
pp. 275-278
Author(s):  
J.N. Hasnidawani ◽  
Noor Azlina Hassan ◽  
H. Norita ◽  
Zahurin Halim ◽  
A. Zuraida
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Sandwich Panel ◽  
Drop Impact ◽  
Main Element ◽  
Kenaf Fiber ◽  
Kenaf Core ◽  
Liquid Natural Rubber ◽  
Impact Modifier ◽  
Modified Epoxy

Kenaf-core sandwich panels were prepared by hand lay-up method with the optimum characteristics. The aim of this study is to determine the effects of modified epoxy on the mechanical properties of the sandwich panel. Mechanical test such as flexural, drop impact and tensile test were performed to investigate the optimum system of kenaf-core sandwich panel within 0-5wt% of kenaf fiber content. It revealed that the optimum loading of kenaf fiber was at 3wt%. Furthermore, this system was studied with the incorporation of liquid natural rubber (LNR) as impact modifier. All tests have been carried out according to the ASTM 365, C297, C393, and D1736. Each final data point is an average value that has been obtained based on a statistical sampling of four specimens. The main element of core structure is kenaf and the skin used in this study is aluminium type 1100. According to compression, flatwise tensile, three point bending and drop impact tests, 3wt% of LNR content exhibit as an excellent impact modifier, in modifying the mechanical properties due to rubber toughening. In addition of too much liquid natural rubber more than 5wt% was substantially interrupted the system.

Shear mechanical properties of the core structure of biomimetic fully integrated honeycomb plates

2018 ◽  
Vol 22 (4) ◽  
pp. 1184-1198 ◽  
Author(s):  
Wanyong Tuo ◽  
Jinxiang Chen ◽  
Mengye Xu ◽  
Zhijie Zhang ◽  
Zhensheng Guo
Keyword(s):  
Mechanical Properties ◽  
Failure Mode ◽  
Shear Failure ◽  
Core Structure ◽  
Resin Matrix ◽  
Joint Interface ◽  
Shear Direction ◽  
Material Interface ◽  
Fully Integrated ◽  
The Core

In the present study, the shear failure mode and mechanical properties of the core structure of biomimetic fully integrated honeycomb plates with sealing edges were investigated experimentally and through the finite element method. The findings are as follows: (1) the failure mode of the sealing edges and honeycomb walls perpendicular to the shear direction is mainly debonding between the fiber and matrix, whereas fiber breakage, debonding between the fiber and matrix and exfoliation of the resin matrix occur in the sealing edges parallel to the shear direction. Meanwhile, the reasonableness and feasibility of the double shear testing apparatus designed in this study were verified, thus confirming the results of research are reliable and valid. (2) Shear failure of the core structure of fully integrated honeycomb plates is mainly fiber debonding appearing in the middle surface of the core structure, which is a failure of the material interface. Stripping failure in the joint interface of the core layer and upper and lower plates does not occur, which indicates that the biological structure possesses excellent integral mechanical properties. (3) The sealing edges parallel to the shear direction and the honeycomb walls that are oriented 30 degrees to the shear direction are the first to fail, followed by the sealing edges and honeycomb walls perpendicular to the shear direction, which is consistent with the microscopic failure phenomenon observed in both directions. To prevent failure at the material interface, the fully integrated honeycomb plates manufactured in this experiment require further improvements. Thus, countermeasures are proposed, such as pre-treating the fiber surface. These findings will specify future research directions to perfect fully integrated honeycomb plates and improve the shear mechanical properties of core structures.

scholarly journals Effect of geometrical variations on the structural performance of shipping container panels: A parametric study towards a new alternative design

2021 ◽  
Vol 8 (1) ◽  
pp. 271-306
Author(s):  
Ilham Widiyanto ◽  
Faiz Haidar Ahmad Alwan ◽  
Muhammad Arif Husni Mubarok ◽  
Aditya Rio Prabowo ◽  
Fajar Budi Laksono ◽  
...  
Keyword(s):  
Sandwich Panel ◽  
The Other ◽  
Structural Performance ◽  
Main Element ◽  
The Finite Element Method ◽  
The Core ◽  
Shipping Container ◽  
Corrugated Wall ◽  
External Loads ◽  
Static Simulation

Abstract In the field of logistics, containers are indispensable for shipments of large quantities of goods, particularly for exports and imports distributed by land, sea, or air. Therefore, a container must be able to withstand external loads so that goods can safely reach their destination. In this study, seven different models of container skins were developed: general honeycomb, cross honeycomb, square honeycomb, corrugated wall, flat, flat with a single stiffener, and flat with a cross stiffener. Testing was performed using the finite element method. In the static simulation, the best results were obtained by the model with corrugated walls. As the main element and the content of the sandwich panel structure, the core plays a role in increasing the ability of the structure to absorb force, thereby increasing the strength of the material. In the thermal simulation, the best results were obtained by the general honeycomb walls. Vibration simulations also showed that the square honeycomb design was better at absorbing vibration than the other models. Finally, the corrugated model had the best critical load value in the buckling simulation.

Evaluation of Physical and Mechanical Properties of Paulownia Wood Core and Fiberglass Surfaces Sandwich Panel

2011 ◽  
Vol 471-472 ◽  
pp. 85-90 ◽  
Author(s):  
Maryam Sobhani ◽  
Abolghasem Khazaeian ◽  
Taghi Tabarsa ◽  
Alireza Shakeri
Keyword(s):  
Mechanical Properties ◽  
Sandwich Panel ◽  
Bending Strength ◽  
Polyester Resin ◽  
Weight Ratio ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Modulus Of Rupture ◽  
The Core ◽  
Paulownia Wood

The purpose of this study was to determine some physical and mechanical properties of sandwich panels manufactured from the core of Paulownia wood and surfaces of multilayer of fiberglass and resins. Paulownia was selected among Hardwoods because of its s low density (0.26 g/cm3) and high strength/weight ratio. Eight treatments were used for experiments: Two kinds of fiberglass (needle and combination of the needle and curtain type), two various resins (polyester and epoxy) and two core thicknesses (9mm and 19mm). Physical properties including density, resistance to water absorption, Dimensional stability, and Mechanical Properties such as internal bonding, compressive and bending strength of panels were measured following ASTM Standard. The results indicated that panels with 19 mm thick core had lower density (0.5g/ cm3) compared to the 9mm thick panels (0.7g/cm3). Bigger volume of wood in the core of panels with higher thickness was the main reason of this result. The experimental results showed that thickness of wood was effective on the modulus of rupture, modulus of elasticity, and compressive strength, significantly. Epoxy resin presented higher internal bond compared to the polyester resin. The two kind of fiberglass (needle one and the combination of needle and curtain type) didn’t have noticeable differences on mechanical properties. It also was found that Paulownia is a promising species for manufacturing sandwich panel.

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