HIGH DAMPING VALUES OF SANDWICH STRUCTURES WITH POLYMER COMPOSITE FACE SHEETS AND FOAM CORES

2021 ◽  
Author(s):  
TUNCAY AYDOGAN ◽  
FERHAT KADIOGLU ◽  
MEHMET EMIN DALFESOGLU
Keyword(s):  
Carbon Fiber ◽  
Flexural Modulus ◽  
Test Procedure ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Sandwich Beams ◽  
Land Vehicles ◽  
Reinforced Polymer ◽  
Constituent Material ◽  
Composite Face

Structures with high damping and reasonable stiffness values are demanded by designers of aerospace and automotive sectors as these features of the structures are remedies to the vibratory conditions that lead to malfunction of many electronics and mechanical components of aerial and land vehicles. In this study, sandwich structure beams with face sheets of woven carbon fiber-reinforced polymer plies and a foam core have been manufactured to provide high damping performance. For this purpose, first, the beams from the carbon fiber plies with different fiber orientations were subjected to the vibrating beam test with free-free boundary conditions, and their damping and flexural modulus values were obtained. It was found that the plies with 450 angle gave the highest damping value with a reasonable modulus. The same test procedure was also applied to the bare foam beams to obtain their dynamic values. Eventually, the plies with the 450 angle were selected as face sheets for the sandwich beams that yielded reasonably high damping and equivalent flexural modulus values. The data obtained from each constituent material, the laminate face sheets and the core, were used as input data for modal simulations of the sandwich beams using a Finite Element Method.

scholarly journals Development of Aluminum Honeycomb Cored Carbon Fiber Reinforced Polymer Composite Based Sandwich Structure

2018 ◽  
Author(s):  
Mehmet Ziya Okur ◽  
Serkan Kangal ◽  
Metin Tanoğlu
Keyword(s):  
Carbon Fiber ◽  
Polymer Composite ◽  
Sandwich Structures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Composite Sandwich ◽  
Composite Sandwich Structures ◽  
Reinforced Polymer ◽  
Aluminum Honeycomb ◽  
Composite Face

Lightweight composite sandwich structures are laminated composite structures that are composed of thin stiff face sheets bonded to a thicker lightweight core in between. These structures have high potential to be used in marine, aerospace, defense and civil engineering applications due to their high strength to weight ratios and energy absorption capacity.In this study, composite sandwich structures were developed with carbon fiber reinforced polymer composite face sheets and aluminum honeycomb core materials with various thicknesses. Carbon fiber/epoxy composite face sheets were fabricated with lamination of [0/90]s carbon fabrics by vacuum infusion technique. Al honeycomb layers were sandwiched together with the face sheets using a thermosetting adhesive. Mechanical tests were carried out to determine the mechanical behavior of face sheets, Al cores and the composite structure. Effect of core thickness on the mechanical properties of the sandwich was investigated.

Restoring Initially Cracked Reinforced Concrete Beams utilizing Carbon Fiber Reinforced Polymer Strips

2019 ◽  
Vol 7 (1) ◽  
pp. 30-34
Author(s):  
A. Ajwad ◽  
U. Ilyas ◽  
N. Khadim ◽  
Abdullah ◽  
M.U. Rashid ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Loading Test ◽  
Control Beam ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced polymer (CFRP) strips are widely used all over the globe as a repair and strengthening material for concrete elements. This paper looks at comparison of numerous methods to rehabilitate concrete beams with the use of CFRP sheet strips. This research work consists of 4 under-reinforced, properly cured RCC beams under two point loading test. One beam was loaded till failure, which was considered the control beam for comparison. Other 3 beams were load till the appearance of initial crack, which normally occurred at third-quarters of failure load and then repaired with different ratios and design of CFRP sheet strips. Afterwards, the repaired beams were loaded again till failure and the results were compared with control beam. Deflections and ultimate load were noted for all concrete beams. It was found out the use of CFRP sheet strips did increase the maximum load bearing capacity of cracked beams, although their behavior was more brittle as compared with control beam.

High thermal conductivity carbon fiber reinforced polymer based on a carbon fiber from pitch and dispersed-filled ENPB matrix

2018 ◽  
pp. 130-137
Author(s):  
E. A. Nikolaeva ◽  
A. N. Timofeev ◽  
K. V. Mikhaylovskiy
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
High Thermal Conductivity ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Carbon Powder ◽  
Fiber Reinforced ◽  
Thermophysical Characteristics ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

This article describes the results of the development of a high thermal conductivity carbon fiber reinforced polymer based on carbon fiber from pitch and an ENPB matrix modified with a carbon powder of high thermal conductivity. Data of the technological scheme of production and the results of determining the physicomechanical and thermophysical characteristics of carbon fiber reinforced polymer are presented. 

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