scholarly journals Mechanical and FEA-Assisted Characterization of 3D Printed Continuous Glass Fiber Reinforced Nylon Cellular Structures

2021 ◽  
Vol 5 (12) ◽  
pp. 313
Author(s):  
Evangelos Giarmas ◽  
Konstantinos Tsongas ◽  
Emmanouil K. Tzimtzimis ◽  
Apostolos Korlos ◽  
Dimitrios Tzetzis
Keyword(s):  
Bending Strength ◽  
Glass Fibers ◽  
Element Model ◽  
Three Point Bending ◽  
Honeycomb Structures ◽  
Glass Fiber Reinforced ◽  
Fiber Fabrication ◽  
3D Printed ◽  
Bending Behavior

The main objective of this study was to investigate the mechanical behavior of 3D printed fiberglass-reinforced nylon honeycomb structures. A Continuous Fiber Fabrication (CFF) 3D printer was used since it makes it possible to lay continuous strands of fibers inside the 3D printed geometries at selected locations across the width in order to optimize the bending behavior. Nylon and nylon/fiberglass honeycomb structures were tested under a three-point bending regime. The microstructure of the filaments and the 3D printed fractured surfaces following bending tests were examined with Scanning Electron Microscopy (SEM). The modulus of the materials was also evaluated using the nanoindentation technique. The behavior of the 3D printed structures was simulated with a Finite Element Model (FEM). The experimental and simulation results demonstrated that 3D printed continuous fiberglass reinforcement is possible to selectively adjust the bending strength of the honeycombs. When glass fibers are located near the top and bottom faces of honeycombs, the bending strength is maximized.

An investigation on the effect of nanoparticle reinforcement and weld surface shape on bending behavior of rotary friction-welded high-density polyethylene

2021 ◽  
pp. 146442072110441
Author(s):  
Vahid Asghari ◽  
Abdolvahed Kami ◽  
Abbasali Bagheri
Keyword(s):  
High Density Polyethylene ◽  
Joint Strength ◽  
Bending Strength ◽  
Welded Joint ◽  
High Density ◽  
Surface Shape ◽  
Bending Tests ◽  
Three Point Bending ◽  
Rotary Friction Welding ◽  
Bending Behavior

In this research, high-density polyethylene rods were joined together using rotary friction-welding. The effects of nanoparticle reinforcement and weld surface shape on the welded joint strength were investigated. To this aim, high-density polyethylene rods with a length of 50 mm and a diameter of 22 mm were machined, and three weld surface shapes, that is, flat, step, and conic shapes (on male and female counterparts), were created. The high-density polyethylene rods were rotary friction-welded with the addition of ZnO and SiO2 nanoparticles. The bending strength of rotary friction-welded rods was assessed by conduction of three-point bending tests. The results showed that both the weld surface shape and nanoparticles influence the bending strength of the welded joints. It was found that the step sample welds have higher bending strength (average bending depth and force of 6.27 mm and 2027.8 N, respectively). Furthermore, except for the case of flat samples, the addition of the reinforcement nanoparticles resulted in the improvement of the bending strength of the rotary friction-welded rods.

scholarly journals Damping Augmentation of Nanocomposites Using Carbon Nanofiber Paper

2006 ◽  
Vol 2006 ◽  
pp. 1-7 ◽  
Author(s):  
Jihua Gou ◽  
Scott O'Braint ◽  
Haichang Gu ◽  
Gangbing Song
Keyword(s):  
Carbon Nanofibers ◽  
Composite Laminates ◽  
Carbon Nanofiber ◽  
Glass Fibers ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Glass Fiber Reinforced ◽  
Short Glass ◽  
Vartm Process

Vacuum-assisted resin transfer molding (VARTM) process was used to fabricate the nanocomposites through integrating carbon nanofiber paper into traditional glass fiber reinforced composites. The carbon nanofiber paper had a porous structure with highly entangled carbon nanofibers and short glass fibers. In this study, the carbon nanofiber paper was employed as an interlayer and surface layer of composite laminates to enhance the damping properties. Experiments conducted using the nanocomposite beam indicated up to 200–700% increase of the damping ratios at higher frequencies. The scanning electron microscopy (SEM) characterization of the carbon nanofiber paper and the nanocomposites was also conducted to investigate the impregnation of carbon nanofiber paper by the resin during the VARTM process and the mechanics of damping augmentation. The study showed a complete penetration of the resin through the carbon nanofiber paper. The connectivities between carbon nanofibers and short glass fibers within the carbon nanofiber paper were responsible for the significant energy dissipation in the nanocomposites during the damping tests.

Effects of Electric Fields on the Bending Behavior of Piezoelectric Composite Laminates

1999 ◽  
Vol 604 ◽  
Author(s):  
J.Q Cheng ◽  
T.Y. Zhang ◽  
M.H. Zhao ◽  
C.F. Qian ◽  
S. W. R. Lee ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Composite Laminates ◽  
Bending Strength ◽  
Piezoelectric Composite ◽  
Element Analysis ◽  
Three Point Bending ◽  
Electrical Loading ◽  
Bending Behavior

AbstractThis Paper investigates the bending behavior of piezoelectric laminates under combined mechanical and electrical loading. The laminate has a PZT - 5H ceramic core sandwiched by graphite/epoxy plates. Three-point bending tests and in-situ acoustic emission measurements were conducted on the PZT-5H laminates preloaded by an applied electric field. The results show that the PZT-5H core fractures first and then delaminaton occurs along the tensile stressed interface between the PZT ceremic and the graphite/epoxy layer. Finite element analysis was performed to analyze stresses in the sandwich structure under combined mechanical and electrical loading. Consequently, the bending strength of the PZT core was evaluated from the experiment data. The electric field, either positive or negative, reduces the fracture strength of the pzt core.

Bending Behavior of Glass Fiber Grid Reinforced Gussasphalt

2015 ◽  
Vol 744-746 ◽  
pp. 754-757
Author(s):  
Bo Gao ◽  
Min Wang ◽  
Zeng Heng Hao
Keyword(s):  
Composite Material ◽  
High Temperature ◽  
Glass Fiber ◽  
Bending Strength ◽  
Bending Test ◽  
Material Technology ◽  
Bending Performance ◽  
Three Point Bending ◽  
Bending Strain ◽  
Bending Behavior

In combination with the composite material technology, add the glass fiber grid into gussasphalt deck pavement system to form glass fiber grid reinforced gussasphalt. Analysis shows that adding the grid can increase the bending performance. Three point bending test was did to do verification and results were indicate that glass fiber grid can improve the anti-bending strength and anti-bending strain in high temperature.

Investigation of selected parameters effect on 3D printed sand mold properties through Taguchi method

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guili Gao ◽  
Weikun Zhang ◽  
Zhimin Du ◽  
Qingyi Liu ◽  
Yanqing Su ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Process Parameters ◽  
Bending Strength ◽  
Three Dimensional ◽  
Sand Mold ◽  
Optimal Process ◽  
Content Type ◽  
Three Point Bending ◽  
Boundary Properties ◽  
3D Printed

Purpose The major concern technologies during the processing through three-dimensional printing (3DP) are the mechanical and boundary properties of sand models. The parameters such as activator content, resolution X, layer thickness and re-coater speed play a vital role in 3DP sand components. The purpose of this paper is to recommend the optimal process parameters for the best sand mold properties. Design/methodology/approach In this paper, taking the parameters of the activator content, resolution X, layer thickness and re-coater speed as the influence factors, an orthogonal test of L16(44) was designed to discuss the influences of those parameters on the mechanical and boundary properties. Three-point bending (3PB) test was used to characterize the actual bending strength, and the boundary accuracy was assessed by the deviation of the three-point bending samples compared with its design scale. Findings The experimental results showed that the resolution X and layer thickness are the main parameters affecting sand mold properties. The strength will attain its maximum when the resolution X and layer thickness are the minimum. The optimal parameters were screened and verified by the confirmation test. The optimal process parameters for best strength and less gas evolution are the activator of 0.19%, resolution X of 0.1 mm, layer thickness of 0.28 mm and re-coater speed of 210 mm/s. Originality/value The novelty of this paper is the select of significant parameters on 3D-printed sand model properties. A mathematical model was built to analyze the effect of these parameters. The optimal process parameters for the best properties were got.

Characterization of Epoxy Composites with TiO2 Additives and E-Glass Fibers as Reinforcement Agent

2016 ◽  
Vol 40 ◽  
pp. 99-104 ◽  
Author(s):  
S. Nallusamy
Keyword(s):  
Glass Fibers ◽  
Research Work ◽  
Flexural Properties ◽  
X Ray Diffraction ◽  
Reinforced Plastics ◽  
Matrix Cracks ◽  
Glass Fiber Reinforced ◽  
Reinforced Fiber ◽  
Fiber Reinforced Plastics

Nanotechnology has become one of the best ever growing technology in scientific and engineering disciplines. Various investigations on nanoparticles have been carried out by many research scholars in the earlier decades. This research work investigates the effect of hybrid e-glass reinforced fiber with epoxy nanocomposite. The nanocomposite laminates were prepared by hand layup technique by varying percentages of Titanium Dioxide (TiO2) nanoparticles of 0, 1, 2 and 3% respectively. The nano additives are added to improve the strength, from wear out resistance and hardness of the polymer composite. The nanocomposite laminates thus prepared are characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) tests. The XRD test revealed that the nanoparticles are well typified and a fully intercalated structure was obtained. By using SEM the fracture failures and matrix cracks on the surfaces of the laminates were investigated. The flexural properties of the glass fiber reinforced plastics improved with the addition of nano TiO2 filler particles. At 3 wt % of TiO2 the flexural strength of 203.36 Mpa was attained. Good interfacial bonding between the fiber and epoxy was the main reason for achieving better flexural properties.

Architecture Inspiration from the Microstructure and Bending Behavior of Nacre of Molluscan Shell

2011 ◽  
Vol 243-249 ◽  
pp. 6494-6498
Author(s):  
Yuan Lin An ◽  
Zhi Ming Liu ◽  
Gan Wang ◽  
Wen Jian Wu
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Bending Strength ◽  
Toughening Mechanism ◽  
Three Point Bending ◽  
Fracture Surfaces ◽  
Molluscan Shell ◽  
Brick And Mortar ◽  
Bending Behavior

Nacre of molluscan shells is famous for its “brick and mortar” microstructure and possesses excellent mechanical properties. Three-point bending strengths of nacre parallel and vertical to the surfaces of platelets are tested and the different fracture surfaces were characterized. The result shows that the values of three-point bending strength in the two directions are approximately the same. Base on the microstructure of and toughening mechanism of nacre, the inspiration for architecture was put forward as follows: to redesign the building materials, toughen the architecture in several ways, and enhance the properties of architecture in all directions. The aim of the paper is to call out learning from nacre to create novel architecture and building materials.

scholarly journals Pengaruh Temperatur Rendah pada Sifat Bending dari Pipa Komposit Epoxy dengan Penguatan Serat Jute

2021 ◽  
Vol 11 (2) ◽  
pp. 200
Author(s):  
I.A.N Pramadyanti ◽  
I.K Adi Atmika ◽  
I.D.G Ary Subagia
Keyword(s):  
Low Temperature ◽  
Bending Strength ◽  
Temperature Treatment ◽  
Bending Test ◽  
Injection Molding Process ◽  
Molding Process ◽  
Three Point Bending ◽  
Low Temperature Treatment ◽  
Composite Pipe ◽  
Bending Behavior

<p class="AbstractText">The experiment about the bending behavior of pipe composite based under the low-temperature treatment was carried out. As for the background of this research is that composite material become a suitable design with user need and it has behavior to substitute metal in engineering products. The research aims to investigate the effect of low temperature against to bending strength behavior of pipe from composite epoxy with jute fiber reinforcement. The low-temperature treatment was applied through an immersion process in dry ice as long as 60 minutes to produces a temperature of -33oC. The pipe composite was manufactured in lamination three layers of jute fabric using the vacuum injection molding process (VRTM). Then, the strength of the composite pipe was tested on the three-point bending method according to the ASTM D 790 standard. The testing results show that composite pipe with low-temperature treatment has a flexural strength average of about 76.559 MPa. Meanwhile, the compo-site pipe without treatment shows the strength of flexural average of about 52.435 MPa. They have the strength of flexural inclination is an average of 68%. In addition, the failures of composite in three-point bending test shows a shrank mode on the compression side and flat tearing at tension side due to the material becomes brittle. The conclusion that low-temperature treatment has an effective influence on the pipe composite mechanical properties.</p>

Testing and Characterization of Simply Supported Pultruded FRP Angle Beams Using Bending Tests

2018 ◽  
Vol 777 ◽  
pp. 548-553 ◽  
Author(s):  
Jaksada Thumrongvut
Keyword(s):  
Failure Modes ◽  
Glass Fibers ◽  
Width Ratio ◽  
Buckling Loads ◽  
Bending Tests ◽  
Three Point Bending ◽  
Reinforced Polymer ◽  
Materials Used ◽  
Flexural Torsional Buckling

Structural performance and buckling behaviors of pultruded fiber-reinforced polymer (PFRP) angle profile beams under three-point bending tests are presented in this paper. The angle specimens were evaluated to investigate the effect of unbraced length of the beams on the buckling responses and critical buckling loads. In total, sixteen specimens, including eight span-to-width ratios (L/b) were tested. The dimension of the angle profile was commercially available 76x6.4 mm. The span-to-width ratios of the specimens were in the range of approximately 13 to 59. The constituent materials used for the angle profiles consist of unidirectional E-glass fibers and polyester resin. From the bending tests, the load-deformation relationships and failure modes of angle beams were reported. The experimental results indicated that the critical buckling load decreases as the span-to-width ratio increases. The degree of flexural-torsional buckling is directly related to span-to-width ratio. Furthermore, the comparison between the critical buckling loads obtained from experimental study and prediction using methods provided in AISC-LRFD design equation for PFRP angle profile beams showed an unsatisfactory correlation of the critical buckling loads.

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