Low Velocity Impact Characterization of Nanoclay and MWCNTs Binary Nanoparticles Modified Carbon/Epoxy Composites Subjected to Marine Environmental Conditioning

2014 ◽  
Author(s):  
Md. Ekramul Islam ◽  
Tanjheel H. Mahdi ◽  
Mahesh V. Hosur ◽  
Alfred Tcherbi-Narteh ◽  
Shaik Jeelani
Keyword(s):  
Carbon Fiber ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Velocity Impact ◽  
Environmental Conditioning ◽  
Carbon Fiber Reinforced ◽  
Marine Environmental ◽  
Montmorillonite Nanoclay

The use of carbon fiber reinforced polymeric composites (FRPC) for naval vessels has been increasingly recently, where high impact resistance is a major concern. Recent advancement in the use of nanoparticles has enabled the design of lighter, stronger and more durable FRPC structures compared to the traditional FRPC. In this study, carbon fiber reinforced epoxy composites were modified with binary (2 wt.% montmorillonite nanoclay and 0.1 wt. % MWCNT together) nanoparticles and subjected to marine environmental conditioning. Low velocity impact response of the modified samples were tested after 6 months of conditioning and compared with control carbon/epoxy composites. The composite laminates were subjected to impact loading at 30J and 40J energy levels. Load vs displacement characteristics were obtained and analyzed. The damage area for all control and modified samples were observed using thermography imaging technique and quantified. From experimental results, it was evident that durability of carbon fiber reinforced epoxy composites was significantly improved by modification with montmorillonite nanoclay along with slight amount of MWCNTs.

scholarly journals The Effect of Low Velocity Impact Loading on Self-Compacting Concrete Reinforced with Carbon Fiber Reinforced Polymers

2021 ◽  
Vol 11 (5) ◽  
pp. 7689-7694
Author(s):  
J. Abd ◽  
I. K. Ahmed
Keyword(s):  
Carbon Fiber ◽  
Impact Loading ◽  
Impact Resistance ◽  
Low Velocity Impact ◽  
Concrete Slabs ◽  
Fiber Reinforced ◽  
Self Compacting Concrete ◽  
Low Velocity ◽  
Velocity Impact ◽  
Carbon Fiber Reinforced

Self-Compacting Concrete (SCC) reduces environmental noise and has more workability. This research presents an investigation of the behavior of SCC under mechanical loading (impact loading). Two types of cement have been used to produce SCC mixtures, Ordinary Portland Cement (OPC) and Portland Limestone Cement (PLC), which reduces the emission of carbon dioxide during the manufacturing process. The mixes were reinforced with Carbon Fiber Reinforced Polymer (CFRP) which is usually used to improve the seismic performance of masonry walls, to replace lost steel reinforcements, or to increase column strength and ductility. Workability tests were carried out for fresh SCC. Prepared concrete slabs of 500×500×50mm were tested for low-velocity impact loading at ages of 28, 56, and 90 days after water curing. The results were compared with the ones of non-reinforced SCC mixes and show a significant effect on the impact resistance after the SCC was reinforced with CFRP. The strongest impact resistance was recorded for reinforcing slabs made from OPC SCC, while for the reinforced concrete slabs produced from PLC the results were less, but at a close rate.

Influence of low-velocity impact-induced delamination on electrical resistance in carbon fiber-reinforced composite laminates

2018 ◽  
Vol 52 (25) ◽  
pp. 3461-3470 ◽  
Author(s):  
Robert J Hart ◽  
OI Zhupanska
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Electrical Resistance ◽  
Low Velocity Impact ◽  
Finite Element Models ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Velocity Impact ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

In this paper, experiments have been performed and finite element models have been developed for studying the influence of low-velocity impact damage on the four-probe electrical resistance of carbon fiber-reinforced polymer matrix laminates. Sixteen-ply and 32-ply AS4/3501-6 laminates with quasi-isotropic layup were analyzed. Electrical resistance was evaluated using a four-step procedure. First, finite element models were created in Abaqus Finite Element Analysis (FEA) for simulating low-velocity impact using a quasi-static loading approach. Second, matrix rupture in the inside plies was evaluated, and delamination analysis was performed at the corresponding interfaces to determine delamination patterns. Third, four-probe electrical finite element models were developed in Abaqus FEA for specimens before and after impact using the concept of effective conducting thickness and the delamination patterns obtained from the delamination analysis. Effects of the low-velocity impact delamination on four-probe top and oblique electrical resistance were studied. Electrical resistance predictions were compared to the experimental data. Both top and oblique resistance planes were sensitive to presence of delamination with the oblique resistance measurement being more sensitive as compared to the top resistance measurement. In addition, the resistance of the 16-ply specimens was more greatly affected by the delamination compared to the 32-ply specimens. The proposed analysis can be utilized for design of carbon fiber-reinforced polymer matrix composites with optimized damage sensing capabilities.

Damage Assessment of Composite Structures Subjected to Low Velocity Impact

2004 ◽  
Vol 261-263 ◽  
pp. 289-294
Author(s):  
Ouk Sub Lee ◽  
M.S. Han ◽  
J.H. Baek ◽  
G.S. Lee
Keyword(s):  
Carbon Fiber ◽  
Composite Structures ◽  
Matrix Cracking ◽  
Low Velocity Impact ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Fiber Reinforced Composite ◽  
Velocity Impact ◽  
Reinforced Composite ◽  
Carbon Fiber Reinforced

To evaluate the damage of composite laminate structures which are consist of maraging steel, rubber and carbon fiber reinforced composite subjected to low velocity impact, the drop weight was used to impact the specimens and nondestructive evaluation using the C-scan was performed. After experiments, impact damages were compared with respect to various temperatures and impact energies. In case of circular plate, the damage characteristics such as delamination, matrix cracking, and fiber breakage were observed at the interface of rubber and carbon fiber reinforced composite. These results were found to be correlated with the deflection of specimen.

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