scholarly journals Deformation and Failure Behavior of Wooden Sandwich Composites with Taiji Honeycomb Core under a Three-Point Bending Test

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2325 ◽  
Author(s):  
Jingxin Hao ◽  
Xinfeng Wu ◽  
Gloria Oporto ◽  
Jingxin Wang ◽  
Gregory Dahle ◽  
...  
Keyword(s):  
Shear Failure ◽  
Dominant Role ◽  
Honeycomb Structure ◽  
Structure Design ◽  
Bending Test ◽  
Failure Behavior ◽  
Sandwich Composites ◽  
Honeycomb Core ◽  
Deformation And Failure ◽  
Three Point Bending

A new type of Taiji honeycomb structure bonded outside with wood-based laminates was characterized from a mechanical standpoint. Both theoretical and experimental methods were employed to analyze comprehensively the deformation behavior and failure mechanism under a three-point bending test. The analytical analysis reveals that a Taiji honeycomb has 3.5 times higher strength in compression and 3.44 times higher strength in shear compared with a traditional hexagonal honeycomb. Considering the strength-weight issue, the novel structure also displays an increase in compression strength of 1.75 times and shear strength of 1.72 times. Under a three-point bending test, indentation and core shear failure played the dominant role for the total failure of a wooden sandwich with Taiji honeycomb core. Typical face yield was not observed due to limited thickness-span ratio of specimens. Large spans weaken the loading level due to the contribution of global bending stress in the compressive skin to indentation failure. A set of analytical equations between mechanical properties and key structure parameters were developed to accurately predict the threshold stresses corresponding to the onset of those deformation events, which offer critical new knowledge for the rational structure design of wooden sandwich composites.

Influence of Honeycomb Core Compression on the Mechanical Properties of the Sandwich Structure

2013 ◽  
Vol 486 ◽  
pp. 283-288
Author(s):  
Ladislav Fojtl ◽  
Soňa Rusnáková ◽  
Milan Žaludek
Keyword(s):  
Mechanical Properties ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Low Velocity Impact ◽  
Bending Test ◽  
Honeycomb Core ◽  
Low Velocity ◽  
Three Point Bending ◽  
Core Technology

This research paper deals with an investigation of the influence of honeycomb core compression on the mechanical properties of sandwich structures. These structures consist of prepreg facing layers and two different material types of honeycomb and are produced by modified compression molding called Crush-Core technology. Produced structures are mechanically tested in three-point bending test and subjected to low-velocity impact and Charpy impact test.

Flexural Behavior of Sandwich Structure with AA 8011 Honeycomb Core and Al 1100 Face Skins

2018 ◽  
Vol 10 (6) ◽  
Author(s):  
M.R. Ashok ◽  
M. Manojkumar ◽  
P.V. Inbanaathan ◽  
R. Shanmuga Prakash
Keyword(s):  
Finite Element Analysis ◽  
Sandwich Structure ◽  
Flexural Behavior ◽  
Bending Test ◽  
Honeycomb Core ◽  
Element Analysis ◽  
Three Point Bending ◽  
The Core ◽  
Flexural Testing ◽  
The Face

This paper details the fabrication and flexural testing of sandwich structure with Aluminium honeycomb core with Aluminium face skins. The material for the face skin is aluminium 1100 and for the core is Aluminium AA8011. The cell size obtained by fabrication is 7mm. The specimen is prepared and tested as per the ASTM standard C393/C393M-11 on a three-point bending test to obtain the ultimate core shear strength and the face skin strength. Finite element analysis is also carried out to validate the experimental test.

Determination of deformation of a highly oriented polymer under three-point bending using finite element analysis

e-Polymers ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 83-88
Author(s):  
Yi-Chang Lee ◽  
Ho Chang ◽  
Ching-Long Wei ◽  
Rahnfong Lee ◽  
Hua-Yi Hsu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shear Failure ◽  
Weight Ratio ◽  
High Strength ◽  
Oriented Polymer ◽  
Element Analysis ◽  
Tensile Direction ◽  
Deformation And Failure ◽  
Three Point Bending

AbstractThe molecular chains of a highly oriented polymer lie in the same direction. A highly oriented polymer is an engineering material with a high strength-to-weight ratio and favorable mechanical properties. Such an orthotropic material has biaxially arranged molecular chains that resist stress in the tensile direction, giving it a high commercial value. In this investigation, finite element analysis (FEA) was utilized to elucidate the deformation and failure of a highly oriented polymer. Based on the principles of material mechanics and using the FEA software, Abaqus, a solid model of an I-beam was constructed, and the lengths of this beam were set based on their heights. Three-point bending tests were performed to simulate the properties of the orthotropic highly oriented polymer, yielding results that reveal both tension failure and shear failure. The aspect ratio that most favored the manufacture of an I-beam from highly oriented polymers was obtained; based on this ratio, a die drawing mold can be developed in the future.

The Development of a Multi-Functional Composite Embedded Smart-Skin Antenna Structure

2012 ◽  
Vol 490-495 ◽  
pp. 2743-2747 ◽  
Author(s):  
Zong Hong Xie ◽  
Wei Zhao ◽  
Lei Li ◽  
Peng Zhang
Keyword(s):  
Antenna Arrays ◽  
Bending Test ◽  
Electrical Performance ◽  
Honeycomb Core ◽  
Antenna Structure ◽  
Functional Composite ◽  
Three Point Bending ◽  
Simulation And Experiment ◽  
Design Requirements ◽  
Smart Skin

This paper focuses on the research and development of the “Multi-functional Composite Embedded Smart-Skin Antenna (MECSSA) Structure” with load-bearing, shape maintaining and communication capabilities. MECSSA structure consists of top and bottom composite thin facesheet, honeycomb core, 4 by 8 micro-strip antenna arrays located among honeycomb core and some adhesive. Simulation and experiment methods were used to study the performance of MECSSA structure. Through the study we found that adhesive is the significant factor of affecting the electrical performance of MECSSA structure, especially for radio frequency (RF) and it must take into account in the research. There may be two ways to avoid the influence of adhesive: compensation and separation. Three point bending test indicated that the strength of MECSSA structure satisfies design requirements.

scholarly journals Microseismic Signal Characterization and Numerical Simulation of Concrete Beam Subjected to Three-Point Bending Fracture

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Nuwen Xu ◽  
Feng Dai ◽  
Chun Sha ◽  
Yingcheng Lei ◽  
Biao Li
Keyword(s):  
Concrete Beam ◽  
Process Analysis ◽  
Failure Process ◽  
Microseismic Monitoring ◽  
Bending Test ◽  
Hydropower Station ◽  
Mass Concrete ◽  
Physical Test ◽  
Deformation And Failure ◽  
Three Point Bending

To study the generation mechanism and failure mode of cracks in mass concrete, microseismic monitoring is conducted on the fracture processes of the three-point bending roller compacted concrete (RCC) beam of Guanyinyan hydropower station. The spectrum characteristics of microseismic signals in different deformation and failure stages of the concrete beam are analyzed, and the identification method of the fracture stages and crack propagation precursors of concrete beam is established. Meanwhile, the Realistic Failure Process Analysis code (RFPA) is adopted to simulate and analyze the entire failure processes of concrete beam from its cracks initiation, development, propagation, and coalescence, until macroscopic fractures formation subjected to three-point bending test. The relation curve of the load, loaded displacement, and acoustic emission (AE) of concrete beam in the three-point bending test is also obtained. It is found that the failure characteristics of concrete beam obtained from numerical experiments agree well with the field physical test results. The heterogeneity of concrete is the major cause of zigzag propagation paths of beam cracks subjected to three-point bending tests. The results lay foundation for further exploring the formation mechanism of dam concrete cracks of Guanyinyan hydropower station.

scholarly journals Lightweight Photovoltaic Composite Structure on Stratospheric Airships

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Xinyun Zhang ◽  
Kangwen Sun ◽  
Dongdong Xu ◽  
Shijun Guo
Keyword(s):  
Mechanical Properties ◽  
Composite Structure ◽  
Radiation Flux ◽  
Energy System ◽  
Bending Test ◽  
Solar Array ◽  
Honeycomb Core ◽  
Three Point Bending ◽  
Solar Radiation Flux

A semirigid solar array is an efficient energy system on the surface of stratospheric airships for utilizing the solar energy, which we believe that it has succeeded in providing some impressive results for conceptual design. This paper developed a lightweight photovoltaic composite structure (LPCS) according to the characteristics of the stratospheric airship capsule. In order to improve the flexibility of the solar cell, we studied the mechanical properties in the different thicknesses of the honeycomb core for LPCS by FEM software and three-point bending test, and we also launched experiments to measure the temperature difference between upper and lower surfaces of the LPCS test samples under different solar radiation flux conditions. The experimental data were examined to evaluate the mechanical properties and thermal insulation performances of LPCS. Considering the quality of the whole structure, the paper finally comes up with the conclusion of the optimal thickness of the honeycomb core with further detailed descriptions.

Finite Element Simulation on Three-point Bending of Brazed Aluminum Honeycomb Panel

2010 ◽  
Vol 168-170 ◽  
pp. 1046-1050 ◽  
Author(s):  
Ming Jun Peng ◽  
Yong Sun ◽  
Ji Yao ◽  
Yong Hua Duan ◽  
Sai Bei Wang
Keyword(s):  
Failure Modes ◽  
Shear Failure ◽  
Failure Load ◽  
Honeycomb Core ◽  
Three Point Bending ◽  
Aluminum Honeycomb ◽  
Longitudinal Bending ◽  
Panel Thickness ◽  
Bending Failure ◽  
Honeycomb Panel

The mechanics behaviors on three-point bending of brazed aluminum honeycomb panel by FEM are investigated in this paper. The results show that honeycomb panel have three typical failure modes under bending load：failure of honeycomb core collapse, the whole panel bending failure and face sheet shear failure. Honeycomb lateral bending failure load is greater than the longitudinal bending failure load. When the ratio of honeycomb core thickness and panel thickness is between 10% to 15%, the strongest cellular panel bending occurs.

Investigation of sandwich composite failure under three-point bending: Simulation and experimental validation

2018 ◽  
Vol 22 (6) ◽  
pp. 1838-1858 ◽  
Author(s):  
Sudharshan Anandan ◽  
Gurjot Dhaliwal ◽  
Shouvik Ganguly ◽  
K Chandrashekhara
Keyword(s):  
Numerical Model ◽  
Sandwich Structure ◽  
Experimental Validation ◽  
Bending Test ◽  
Core Material ◽  
Scale Model ◽  
Honeycomb Core ◽  
Three Point Bending ◽  
Failure Initiation ◽  
Meso Scale

A sandwich structure consists of a two thin and strong facesheets, bonded to a thick lightweight core material. The mechanical response of a sandwich structure depends on the properties of its constituents. A numerical model and experimental validation of the three-point bending test of sandwich composites are presented in this study. The core material is aluminum honeycomb. The facesheets are made of IM7/Cycom5320-1, which is a carbon fiber/epoxy prepreg system. A comprehensive model of the failure under flexural loading was developed. Facesheet failure was modeled using Hashin’s failure criteria. A detailed meso-scale model of the honeycomb core was included in the model. The experiments indicated that failure initiation was due to local buckling in the honeycomb core. Failure propagation was in the form of core failure, facesheet compressive failure, and interlaminar failure. The developed meso-scale model was able to accurately simulate failure initiation and propagation in the composite sandwich structure. The effect of elevated temperature on the three-point bending behavior was studied numerically as well as experimentally. An increase in test temperature to 100°C resulted in a drop of 9.2% in flexural strength, which was also predicted by the numerical model.

scholarly journals Optimization and Experimental Testing of Car Door Handle Using 3 Point Bending Test and 3D Printing Technology

2021 ◽  
pp. 556-573
Author(s):  
Brahmanand Singh ◽  
Prof. Pawankumar R. Sonawane ◽  
Dr. Kiran C. More
Keyword(s):  
3D Printing ◽  
Experimental Testing ◽  
Honeycomb Structure ◽  
Bending Test ◽  
Human Beings ◽  
Printing Technology ◽  
Three Point Bending ◽  
3D Printing Technology ◽  
Sense Of Security ◽  
Opening And Closing

Doors are the most essential hardware used by human beings daily. Doors are used for sense of security to ourselves. To operate the door, we need door handle and it’s the most important part in door. Door handles are used for opening and closing of a door with minimum effort. Various types of door handle such as lever handle, doorknob and pull handles are the different kind of handles we came across in our day-to-day life. There are various designs of door handles are available so that we are unaware of door handles selection criteria. The aim of this work is to study different material and internal design of car door interior handle. For that purpose, we used FEA software for understanding which material and which shape have more strength and optimize design. In this project we used two different structure one is honeycomb structure and other is auxetic structure for inside section of car door interior handle. Optimized car door interior handle will be manufacture using 3D printing technology. The behaviors of these structures under three-point bending were investigated by using UTM.

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