scholarly journals Effect of Plasma Treatment on the Impact Behavior of Epoxy/Basalt Fiber-Reinforced Composites: A Preliminary Study

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1293
Author(s):  
Maria Rosaria Ricciardi ◽  
Ilaria Papa ◽  
Giuseppe Coppola ◽  
Valentina Lopresto ◽  
Lucia Sansone ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Treatment ◽  
Plasma Treatment ◽  
Treatment Time ◽  
Basalt Fiber ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Chamber Pressure ◽  
The Impact

Hydrophobic surfaces are highly desired for several applications due to their exceptional properties such as self-cleaning, anti-icing, anti-friction and others. Such surfaces can be prepared via numerous methods including plasma technology, a dry technique with low environmental impact. In this paper, the effect of a one-step sulfur hexafluoride (SF6) plasma treatment upon the low velocity impact behavior of basalt/epoxy composites has been investigated by using several characterization techniques. A capacitive coupled radiofrequency plasma system was used for the plasma surface treatment of basalt/epoxy composites, and suitable surface treatment conditions were experimentally investigated with respect to gas flow rate, chamber pressure, power intensity, and surface treatment time by measuring the water droplet contact angle of treated specimens. The contact angle measurements showed that treating with SF6 plasma would increase the hydrophobicity of basalt/epoxy composites; moreover, the impact results obtained on reinforced epoxy basalt fiber showed damage in a confined area and higher impact resistance for plasma-treated basalt systems.

Effect of Plasma Surface Treatment on the Impact Behavior of Basalt/Epoxy Composites

2019 ◽  
Vol 813 ◽  
pp. 441-446
Author(s):  
Maria Rosaria Ricciardi ◽  
Ilaria Papa ◽  
Giuseppe Coppola ◽  
Filomena Impero ◽  
Valentina Lopresto ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Plasma Treatment ◽  
Composite Laminates ◽  
Atmospheric Oxygen ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Composite Surface ◽  
The Impact

In this study, the effects of surface treatment of a low-temperature atmospheric oxygen plasma on basalt/epoxy composites were investigated to improve the hydrophobility of the composite surface. After the plasma treatment, the unmodified and surface treated composite laminates have been experimentally characterized by performing contact angle measurements, low-velocity impact tests and indentation depth on the impacted laminates. Results have showed a dependence of such composite properties on the plasma coating deposition and on the treatment parameters outlining the need to optimize both the plasma power and exposition time to plasma in order to assess the efficiency of the plasma treatment and establish the optimal processing conditions.

Use of plasma treated basalt fiber as a concrete additive

2020 ◽  
Vol 63 (7) ◽  
pp. 60-65
Author(s):  
Gulnara I. Amerkhanova ◽  
◽  
Alexey I. Khatsrinov ◽  
Lyubov A. Zenitova ◽  
◽  
...  
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Gas Flow ◽  
Treatment Time ◽  
Reference Sample ◽  
Basalt Fiber ◽  
Plasma Modification ◽  
Chamber Pressure ◽  
Mass Percent ◽  
Mode 2

The paper investigates the effect of plasma treatment of basalt fiber on its hydrophilic behavior, which was estimated by contact angle. The pre-chopped basalt fiber was put in a soft polyethylene container to prevent fiber particles from being carried away by a flow of plasma gas, and to protect outlet gas ducts against clogging. It was evaluated what effect the plasma modification had on the strength properties of BST V40 P2 concrete. As the treatment time increases the contact angle becomes higher until treatment time reaches 10 minutes. The contact angle-treatment power dependence passes through a maximum. The highest value has been observed at a treatment power of 0.6 kW both on the day of treatment and after a 5-day rest period. The wettability of basalt fiber after 5 days of exposure after the first wetting leads to lower results, but remains at a fairly high level. The retreatment after a 5-day curing period yields lower results, but the level remains sufficiently high. The highest contact angle has been observed at a treatment power of 0.6 kW, gas flow rate (G) of 0.04 g/s, chamber pressure (P) of 20 Pa, with air/argon mixture (1:1) as plasma gas. Were tested samples of concrete BST V 40 P 2 with the addition of plasma-treated basalt fiber in the amount of 0.5 and 3% of the mass. on the strength index under two modes of basalt fiber processing: in mode 1 the treatment time was 10 minutes, the treatment power was 1.5 kW; and in mode 2 the treatment time was 5 minutes, the treatment power was 0.6 kW, with the addition of plasma treated basalt fiber (0.5 and 3 mass percent). It was found that the plasma treatment of basalt fiber before chopping gave concrete a higher strength than plasma treatment followed by chopping. Concrete has the highest strength when basalt fiber (3 mass percent) is subjected to plasma treatment in mode 2. Furthermore, the strength increased by 23 mass percent in comparison with the reference sample.

Composite Materials Based on Plasma Treated Basalt Fibers for Heavy-Duty Concrete Products

2020 ◽  
Vol 299 ◽  
pp. 175-180
Author(s):  
Gulnara I. Amerkhanova ◽  
Aleksey I. Khatsrinov ◽  
Lyubov A. Zenitova
Keyword(s):  
Plasma Treatment ◽  
Gas Flow ◽  
Treatment Time ◽  
Basalt Fiber ◽  
Rest Period ◽  
Chamber Pressure ◽  
Mass Percent ◽  
Curing Period ◽  
Mode 2 ◽  
Argon Mixture

The paper investigates the effect of plasma treatment of basalt fiber on its wettability, which is determined by the ability to absorb water. As the treatment time increases the wettability becomes higher, up to 10 minutes. The wettability-treatment power dependence passes through a maximum. The highest value is observed at a treatment power of 0.6 kW both on the day of treatment and after a 5-day rest period. A further growth in power not only does not increase this value, but in fact decreases it. The retreatment after a 5-day curing period yields lower results, but remains sufficiently high. The highest wettability is observed at a treatment power of 0.6 kW, gas flow rate of 0.04 g/s, chamber pressure of 20 Pa, air/argon mixture (1:1) as plasma support gas. The strength of concrete specimens BST V40 P2 was tested with two treatment modes: in mode 1 the treatment time was 10 minutes, the treatment power was 1.5 kW; and in mode 2 the treatment time was 5 minutes, the treatment power was 0.6 kW, with the addition of plasma treated basalt fiber (0.5 and 3 mass percent). Concrete has the highest strength when basalt fiber (3 mass percent) is subjected to plasma treatment in mode 2. In addition, the strength increases by 18 mass percent in comparison with the reference.

scholarly journals Surface Activation of Poly(Methyl Methacrylate) with Atmospheric Pressure Ar + H2O Plasma

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 228 ◽  
Author(s):  
Essam Abdel–Fattah
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Methyl Methacrylate ◽  
Surface Treatment ◽  
Plasma Treatment ◽  
Surface Free Energy ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Plasma Treatment Time ◽  
Pmma Surface

The atmospheric pressure of Ar + H 2 O plasma jet has been analyzed and its effects on the poly(methyl methacrylate) (PMMA) surface has been investigated. The PMMA surface treatment was performed at a fixed gas flow-rate discharge voltage, while varying the plasma treatment time. The Ar + H 2 O plasma was studied with optical emission spectroscopy (OES). Optimum plasma conditions for PMMA surface treatment were determined from relative intensities of Argon, hydroxyl radical (OH), oxygen (O) I emission spectra. The rotational temperature T rot of Ar + H 2 O plasma was determined from OH emission band. The PMMA surfaces before and after plasma treatment were characterized by contact angle and surface free energy measurements, X-ray photoelectrons spectroscopy (XPS), atomic force microscope (AFM) and UV-spectroscopy. The contact angle decreased and surface free energy increased with plasma treatment time. XPS results revealed the oxygen to carbon ratio (O/C) on plasma-treated PMMA surfaces remarkably increased for short treatment time ≤60 s, beyond which it has weakly dependent on treatment time. The carbon C1s peak deconvoluted into four components: C–C, C–C=O, C–O–C and O–C=O bonds and their percentage ratio vary in accordance with plasma treatment time. AFM showed the PMMA surface roughness increases with plasma treatment time. UV-visible measurements revealed that plasma treatment has no considerable effect on the transparency of PMMA samples.

Fatigue Behavior of Impacted Plain-Weave Glass/Epoxy Composites under Tensile Fatigue Loading

2005 ◽  
Vol 297-300 ◽  
pp. 1291-1296 ◽  
Author(s):  
Ki Weon Kang ◽  
Jung Kyu Kim ◽  
Heung Seob Kim
Keyword(s):  
Fatigue Life ◽  
Impact Damage ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Behavior ◽  
Plain Weave ◽  
The Impact

The goals of this paper are to identify the impact damage behavior of plain-weave E-glass/epoxy composites and predict the fatigue life of the composites with impact-induced damage under constant amplitude loading. To identify these behaviors, the low velocity impact and fatigue after impact tests are performed for glass/epoxy composites having two types of fiber orientations. The impact damage behavior is dependent on the fiber orientation of the composites. The fatigue life of the impacted composites can be identified through the prediction model, which was proposed on the carbon/epoxy laminates by authors regardless of fiber orientations.

Experimental and Numerical Study of Basalt FRP Strip Strengthened RC Slabs under Impact Loads

2020 ◽  
Vol 20 (06) ◽  
pp. 2040001 ◽  
Author(s):  
Wensu Chen ◽  
Thong M. Pham ◽  
Mohamed Elchalakani ◽  
Huawei Li ◽  
Hong Hao ◽  
...  
Keyword(s):  
Failure Modes ◽  
Shear Failure ◽  
Numerical Study ◽  
Impact Resistance ◽  
Basalt Fiber ◽  
Impact Behavior ◽  
Impact Loads ◽  
Quantitative Measurements ◽  
Rc Slabs ◽  
The Impact

Basalt fiber-reinforced polymer (BFRP) has been applied for strengthening concrete structures. However, studies on reinforced concrete (RC) slabs strengthened by BFRP strips under impact loads are limited in open literature. This study investigates the efficiency of using BFRP strips with various strengthening layouts and anchoring schemes on the impact resistance of RC slabs. A total of 11 two-way square slabs were prepared and tested, including one reference specimen without strengthening and ten slabs strengthened with BFRP strips and/or anchors. The RC slabs were impacted by a drop weight with increasing height until slab failure. The observed failure modes include punching shear failure, BFRP sheet debonding and reinforcement fracture. The failure modes and the effects of using various strengthening schemes on the impact resistant capacity of RC slabs were examined. The quantitative measurements, such as impact velocity, indentation depth and diameter, were compared and discussed. In addition, numerical studies were carried out by using LS-DYNA to simulate the impact tests of RC slabs with and without BFRP strengthening. With the calibrated numerical model, the impact behavior of slabs with various dimensions and strengthening layouts under different impact intensities can be predicted with good accuracy.

Effect of Temperature and Moisture on the Impact Behavior of Graphite/Epoxy Composites: Part II—Impact Damage

1995 ◽  
Vol 17 (1) ◽  
pp. 11 ◽  
Author(s):  
WS Johnson ◽  
JE Masters ◽  
ML Karasek ◽  
LH Strait ◽  
MF Amateau ◽  
...  
Keyword(s):  
Impact Damage ◽  
Epoxy Composites ◽  
Impact Behavior ◽  
Effect Of Temperature ◽  
The Impact
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