scholarly journals Chiral-Lattice-Filled Composite Tubes under Uniaxial and Lateral Quasi-Static Load: Experimental Studies

2021 ◽  
Vol 11 (9) ◽  
pp. 3735
Author(s):  
Kadir Gunaydin ◽  
Aykut Tamer ◽  
Halit Suleyman Turkmen ◽  
Giuseppe Sala ◽  
Antonio Mattia Grande
Keyword(s):  
Energy Absorption ◽  
Static Load ◽  
Fiber Composite ◽  
Experimental Studies ◽  
Carbon Fiber Composite ◽  
Composite Tubes ◽  
Printing Technique ◽  
Composite Configuration ◽  
3D Printing Technique ◽  
Filled Composite

Our research investigated the energy absorption characteristics of chiral auxetic lattices filled cylindrical composite tubes subjected to a uniaxial and lateral quasi-static load. The lattice structures were manufactured using a 3D printing technique. Carbon fiber composite tubes without filler material were initially subjected to uniaxial and lateral quasi-static crushing load. The same types of experiment were then performed on chiral lattices and chiral lattices filled composite tubes. For the different cases, the load–displacements curves were analyzed and the specific energy absorption (SEA) values were compared. The SEA capability for the axial quasi-static crushing of the chiral lattices filled composite tubes decreased in comparison with the hollow composite design. However, the most significant result was that the average SEA value in the case of lateral loading increased dramatically in comparison with the hollow composite configuration.

Study of Properties of 3D Printed Short Carbon Fiber Composite

2020 ◽  
Vol 841 ◽  
pp. 182-187
Author(s):  
Nathathai Saithongkum ◽  
Karuna Tuchinda
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
3D Printing ◽  
Fiber Composite ◽  
Fiber Direction ◽  
Carbon Fiber Composite ◽  
Short Carbon Fiber ◽  
Printing Technique ◽  
Short Carbon ◽  
3D Printing Technique

The properties of composite materials do not depend only on the properties of raw materials but also other parameters such as volume fraction, geometry, dimension and material distribution etc. Carbon fiber reinforced polymer is one of the top choices of composite material because carbon fiber has light weigh with high tensile strength. For fiber-based composite such as carbon fiber composite, directions of carbon fiber with respect to loading direction could also affect to the strength of composite material under load. In this work, the properties of short carbon fiber-resin composite were investigated (fiber length of 0.2 mm.) with two different fiber orientations, i.e. 0 and 90 degrees to applied load. The 3D printing technique was employed in order to control carbon fiber direction and minimize material loss leading to material cost reduction. It was found that 3D printing technique could control direction of fiber in most case. However, at area with high curvature, the unexpected fiber direction was observed due to post hot process during which material flow was expected. It should also be noted that fiber path during 3D printing process may be very crucial as it could result in low strength local area due to low fiber density. This area could promote stress concentration leading to final fracture.

Energy Absorption of Braided Glass Fiber Reinforced Composite Tubes

2000 ◽  
Author(s):  
Shu Ching Quek ◽  
Anthony M. Waas
Keyword(s):  
Glass Fiber ◽  
Energy Absorption ◽  
Damage Mechanics ◽  
Progressive Failure ◽  
Fiber Composite ◽  
Continuum Damage Mechanics ◽  
Composite Tubes ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Glass Fiber Composite

Abstract Results from an experimental and analytical study on the behavior of braided glass fiber composite tubes under quasi-static crush conditions are presented. The composite tubes have an initiator plug introduced at one open end (chamfered) while the other end is clamped. This procedure causes the tube to ‘flare’ outwards into fronds and results in the progressive failure of the tube in the axial and hoop direction without global tube buckling. Axial force and axial displacements are measured during these tests in order to assess energy absorption. In addition, readings from strain gages that are placed at critical locations on the tube walls are used to assess the state of strain on the tube walls away from the crush end. During a crush test, the axial load ascended to a maximum value and subsequently settled to a plateau value about which the load oscillated during the progressive crushing of the tube. The oscillations exhibited distinct periodicity. Results from an analytical model that best simulates the failure of these tubes are presented. The model is based on an axisymmetric formulation of the cylindrical shell equations in conjunction with ideas from classical fracture mechanics and continuum damage mechanics.

scholarly journals Investigation of the wind generator blades material resistance to the lightning current action

2018 ◽  
Vol 245 ◽  
pp. 15001 ◽  
Author(s):  
Yuri Adamyan ◽  
Sergey Krivosheev ◽  
Tatyana Minevich
Keyword(s):  
Current Pulse ◽  
Fiber Composite ◽  
Experimental Studies ◽  
Carbon Fiber Composite ◽  
Long Tail ◽  
Wind Generator ◽  
Lightning Current ◽  
Time Period ◽  
Different Types ◽  
The Impact

This paper is devoted to the problems of lightning protection of composite materials of wind generator blades. The results of experimental studies for carbon fibers under different types of lightning current pulse effects are provided. A significant increase in the degree of destruction of materials is shown for the pulse approximating field experiment results as compared with the standard lightning current pulse. We show that under the impact of the standard current pulse there is no significant material destruction, and the release of the discharge products is also insignificant. Also we shown that under the impact of the current pulse having a long «tail» time period (the current pulse close to the real one) there is an ignition of the carbon fiber composite material near the edges of the feeding electrode. With this the burning process doesn’t end after the end of the current pulse. The description of the pulse current generator created for experiments is given.

A Novel Microscale 3D Printing Based on Electric-Field-Driven Jet Deposition

2018 ◽  
Author(s):  
Lei Qian ◽  
Hongbo Lan ◽  
Guangming Zhang ◽  
Jiawei Zhao ◽  
Shuting Zou
Keyword(s):  
3D Printing ◽  
Electric Field ◽  
Low Cost ◽  
Experimental Studies ◽  
Counter Electrodes ◽  
Micro Scale ◽  
Multi Scale ◽  
Printing Technique ◽  
Jet Printing ◽  
3D Printing Technique

This paper presents an electric-field-driven (EFD) jet deposition 3D printing technique, which is based on the induced electric field and electrohydrodynamic (EHD) cone-jetting behavior. Unlike the traditional EHD-jet printing with two counter electrodes, the EFD jet 3D printing only requires a nozzle electrode to induce an electric field between the nozzle and the target substrate. Taking into account both printing accuracy and printing efficiency, two novel working modes which involve pulsed cone-jet mode and continuous cone-jet mode, are proposed for implementing multi-scale 3D printing. In this work, significant relationships between the printing results and process parameters (voltage, air pressure, pulse duration time, and stage velocity) were investigated to guide the reliable printing in both working modes. Furthermore, the experimental studies were carried out to demonstrate the capabilities and advantages of the proposed approach, which included the suitability of various substrate, the capacity of conformal printing, and the diversity of the compatible materials. Finally, four typical printing results were provided to demonstrate the feasibility and effectiveness of the proposed technology for micro-scale 2D patterning and macro/microstructures multi-scale fabrication. As a result, this research provides a novel micro-scale 3D printing technique with low cost, high resolution and good generalizability. The breakthrough technique paves a way for implementing highresolution 3D printing, especially for multi-scale and multimaterial additive manufacturing.

Prestressed Carbon Fiber Composite Overwrapped Gun Tube

2008 ◽  
Author(s):  
Andrew Littlefield ◽  
Edward Hyland ◽  
Jack Keating
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Carbon Fiber Composite
Sign in / Sign up

Export Citation Format

Share Document