scholarly journals Optimization of the Composite Repair Work using 5H Satin Dry Glass Fabric and Epoxy Resin LY5052/HY5052 Materials through the Vacuum Bagging Technique

2016 ◽  
Vol 739 ◽  
pp. 012052 ◽  
Author(s):  
Hartono ◽  
Mochammad Rifai ◽  
Handoko Subawi
Keyword(s):  
Epoxy Resin ◽  
Glass Fabric ◽  
Repair Work ◽  
Composite Repair

scholarly journals Influence of Polyurea Composite Coating on Selected Mechanical Properties of AISI 304 Steel

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3137 ◽  
Author(s):  
Monika Duda ◽  
Joanna Pach ◽  
Grzegorz Lesiuk
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Composite Coating ◽  
Composite Coatings ◽  
Glass Fabric ◽  
Coated Sample ◽  
Hemp Fiber ◽  
Aisi 304 ◽  
Aisi 304 Steel ◽  
The Impact

This paper contains experimental results of mechanical testing of the AISI 304 steel with composite coatings. The main goal was to investigate the impact of the applied polyurea composite coating on selected mechanical properties: Adhesion, impact resistance, static behavior, and, finally, fatigue lifetime of notched specimens. In the paper the following configurations of coatings were tested: EP (epoxy resin), EP_GF (epoxy resin + glass fabric), EP_GF_HF (epoxy resin + glass fabric hemp fiber), EP_PUA (epoxy resin + polyurea) resin, EP_GF_PUA (epoxy resin + glass fabric + polyurea) resin, and EP_GF_HF_PUA (epoxy resin + glass fabric + hemp fiber + polyurea) resin. The highest value of force required to break adhesive bonds was observed for the EP_PUA coating, the smallest for the single EP coating. A tendency of polyurea to increase the adhesion of the coating to the base was noticed. The largest area of delamination during the impact test was observed for the EP_GF_HF coating and the smallest for the EP-coated sample. In all tested samples, observed delamination damage during the pull-off test was located between the coating and the metallic base of the sample.

Damage Quantification and Location Detection in Carbon Nanotube Enhanced Composite Panels

2016 ◽  
Author(s):  
Mahmoud K. Ardebili ◽  
Kerim T. Ikikardaslar ◽  
Shivron Sugrim ◽  
Feridun Delale
Keyword(s):  
Finite Element ◽  
Carbon Nanotube ◽  
Epoxy Resin ◽  
Electrical Potential ◽  
Finite Element Method Simulation ◽  
Glass Fabric ◽  
Composite Panels ◽  
Damage Location ◽  
Damage Quantification ◽  
Location Detection

Epoxy resin based composite panels enhanced with carbon nanotube were subjected to damage while their electrical resistivity was monitored. The objective of the study was to utilize the composite piezoresistivity as means of damage quantification and location detection. Two different multi walled CNT-epoxy composites were manufactured for this study: one was CNT enhanced epoxy resin and the second was glass fabric reinforced CNT epoxy resin. Rectangular panels of various proportions were studied. Disks made out of copper foil were affixed to surfaces of CNT epoxy specimen, while in glass fabric CNT epoxy specimen the disks were embedded inside the samples. The disks acted as electrodes, enabling resistivity measurements using Kelvin in-line four-probe technique. The technique minimizes contact resistance between electrodes and the composite. Two different configurations of electrode network were employed to scan resistivity of entire samples. The networks included evenly spaced electrodes that spanned the entire surface of the panel, and one that covered the panel’s diagonals and its edges. To further investigate influence of electrodes distribution, finite element methods were employed to solve for the electrical potential distribution in the panel simulating various damage location and extent. Pre and post damage resistivity change was used as gauge in determining the damage location and its extent quantification. The finite element method simulation results matched experimental data closely allowing further studies with electrodes distribution, damage geometry and location. The results indicated that a relatively small spaced electrode network is capable of determining location and quantification of visible and hardly visible damages. As spacing between electrodes is increased they become less responsive to smaller damages.

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