Manufacturing a carbon/epoxy NACA 23018 airfoil skin using a circular braiding machine: experimental and numerical study

2021 ◽  
pp. 152808372199377
Author(s):  
Jalil Hajrasouliha ◽  
Mohammad Sheikhzadeh
Keyword(s):  
Numerical Study ◽  
Filament Winding ◽  
Bending Test ◽  
Elastic Response ◽  
Manufacturing Processes ◽  
Fiber Reinforced Composite ◽  
Four Point Bending ◽  
Reinforced Composite ◽  
Four Point Bending Test ◽  
Meso Scale

In the interest of reducing the weight and also cost of blade skins, various automatic preform manufacturing processes were developed including tape laying, filament winding and braiding. Among them, the circular braiding process was found to be an efficient method in producing seamless preforms on mandrels with various geometries. In this regard, an attempt was made to produce a carbon fiber reinforced composite with the shape of NACA 23018 airfoil using a circular braiding machine. Thus, suitable wooden mandrels were manufactured using NACA 23018 airfoil coordinates, which were obtained by assuming the perimeter of 20 cm. Furthermore, both biaxially and triaxially braided preforms were produced and subsequently impregnated with epoxy resin through an appropriate fabrication method. To assess their performance, four-point bending test was carried out on samples. Ultimately, the elastic response of braided composite airfoils was predicted using a meso-scale finite element modeling and was validated with experimental results.

Creep of GLT Beams during Four-Point Bending Test

2016 ◽  
Vol 827 ◽  
pp. 243-246
Author(s):  
Lenka Melzerová ◽  
Michal Šejnoha ◽  
Pavel Klapálek
Keyword(s):  
Computational Model ◽  
Numerical Simulations ◽  
Creep Deformation ◽  
Time Variation ◽  
Bending Test ◽  
Elastic Response ◽  
Hold Period ◽  
Four Point Bending ◽  
Glued Laminated Timber ◽  
Four Point Bending Test

The present work is concerned with the evaluation of creep deformation developed during the four-point bending test of glued laminated timber beams. In particular, three deflections (at the mid-span of the beam, and below the points of load application) were recorded for each tested beam. The time variation of deflections at 110 loading levels was examined in details for the set of five beams. It can be seen that the effect of creep covers about 10 – 20% of the overall strain. To proceed with numerical simulations requires, however, building first a reliable computational model that agrees well with purely elastic response of the beam. Thus additional measurements were carried out assuming a rather short hold period to eliminate the creep effects. The results were then compared with numerical simulations promoting the computational model to be used in more advanced simulations incorporating a suitable rheological model.

Study on Ultimate State of Filament Winding FRP Pipes Under Bending Force

2018 ◽  
Author(s):  
Yuzo Shiogama ◽  
Nobuaki Kumagai ◽  
Yutaka Ando ◽  
Toshiyuki Kuribayashi
Keyword(s):  
Water Pressure ◽  
Filament Winding ◽  
Bending Test ◽  
Test Results ◽  
Ultimate State ◽  
Bending Force ◽  
Four Point Bending ◽  
Four Point Bending Test

To investigate of ultimate state of filament winding FRP pipe against bending force caused by earthquake, we perform four-point bending test of the FRP pipes with 1.4MPa inner water pressure. Twelve pipes with four different proportions are applied to the test. The test results show that the damaged form and strength depends on the proportion of the pipe. It is considered reasonable to set the allowable bending capacities according to size of the pipes.

scholarly journals Structural behaviour of PSCC slab panel under four-point bending test

2021 ◽  
Vol 1144 (1) ◽  
pp. 012039
Author(s):  
M A Iman ◽  
N Mohamad ◽  
A A A Samad ◽  
Steafenie George ◽  
M A Tambichik ◽  
...  
Keyword(s):  
Bending Test ◽  
Structural Behaviour ◽  
Four Point Bending ◽  
Four Point Bending Test

Research on Damage and Bending Properties of AZ31 Magnesium Alloy

2012 ◽  
Vol 184-185 ◽  
pp. 1163-1166
Author(s):  
Xi An Xie ◽  
Gao Feng Quan
Keyword(s):  
Magnesium Alloy ◽  
Applied Load ◽  
Bending Strength ◽  
Az31 Magnesium Alloy ◽  
Bending Test ◽  
Bending Properties ◽  
Four Point Bending ◽  
Heat Treated ◽  
Four Point Bending Test ◽  
Initial Cracks

Through the four-point bending test of lath-shaped heat treated AZ31 magnesium alloy, the bending properties and damage characteristics were explored. The results show that the optimal bending strength of the magnesium alloy were 355.1MPa and 259.2MPa for extruded and cast samples, respectively, after corresponding heat treatment with 350°C, 90min and 400°C, 30min. The initial cracks both occurred at the loading point after applied load exceeded the yield limit of AZ31 magnesium alloy. Surface bump, cracks and other damage morphology accompanied by a large number of twinning organizations were found on the surface of the samples.

scholarly journals Geometry Effects in Four-Point Bending Test for Thin Sheet Studied by Finite Element Simulation

2016 ◽  
Vol 57 (3) ◽  
pp. 335-343 ◽  
Author(s):  
Xiaolong Dong ◽  
Hongwei Zhao ◽  
Lin Zhang ◽  
Hongbing Cheng ◽  
Jing Gao
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Thin Sheet ◽  
Bending Test ◽  
Four Point Bending ◽  
Element Simulation ◽  
Four Point Bending Test ◽  
Geometry Effects

scholarly journals Fatigue Crack Extension in Four-point Bending Test for Steels Imitated Heat Affected Zone

2015 ◽  
Vol 64 (4) ◽  
pp. 323-329 ◽  
Author(s):  
Hidetoshi KOBAYASHI ◽  
Noboru KONDA ◽  
Joy-A-Ka SUTEP ◽  
Ketaro HORIKAWA ◽  
Takeshi YAMAUCHI
Keyword(s):  
Fatigue Crack ◽  
Heat Affected Zone ◽  
Crack Extension ◽  
Bending Test ◽  
Four Point Bending ◽  
Four Point Bending Test
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