scholarly journals Evaluation of Dispersion Methods and Mechanical Behaviour of Glass Fibre Composites with Embedded Self-Healing Systems

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1642
Author(s):  
Ionut Sebastian Vintila ◽  
Sorin Draghici ◽  
Horia Alexandru Petrescu ◽  
Alexandru Paraschiv ◽  
Mihaela Raluca Condruz ◽  
...  
Keyword(s):  
Impact Strength ◽  
Thermal Cycling ◽  
Glass Fibre ◽  
Mechanical Behaviour ◽  
Epoxy Matrix ◽  
Impact Testing ◽  
Self Healing ◽  
Dispersion Method ◽  
Fibre Composites ◽  
The Impact

The present paper is focused on evaluating the most suitable dispersion method in the epoxy matrix of two self-healing systems containing dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene (ENB) monomers encapsulated in a urea-formaldehyde (UF) shell, prior to integration, fabrication and impact testing of specimens. Both microstructural analysis and three-point bending tests were performed to evaluate and assess the optimum dispersion method. It was found that ultrasonication damages the microcapsules of both healing systems, thus magnetic stirring was used for the dispersion of both healing systems in the epoxy matrix. Using magnetic dispersion, 5%, 7%, 10%, 12% and 15% volumes of microcapsules were embedded in glass fibre composites. Some of the samples were subjected to thermal cycling between −20 °C and +100 °C for 8 h, to evaluate the behaviour of both healing systems after temperature variation. Impact test results showed that the mechanical behaviour decreases with increasing microcapsule volume, while for specimens subjected to thermal cycling, the impact strength increases with microcapsule volume up to 10%, after which a severe drop in impact strength follows. Retesting after 48 h shows a major drop in mechanical properties in specimens containing 15% MUF-ENB microcapsules, up to total penetration of the specimen.

Preparation and Performance of Self-Healing Epoxy Composites by Microcapsulated Approach

2014 ◽  
Vol 636 ◽  
pp. 73-77 ◽  
Author(s):  
Xin Hua Yuan ◽  
Qiu Su ◽  
Li Yin Han ◽  
Qian Zhang ◽  
Yan Qiu Chen ◽  
...  
Keyword(s):  
Impact Strength ◽  
Epoxy Matrix ◽  
The Self ◽  
Epoxy Composites ◽  
Fracture Plane ◽  
Crack Plane ◽  
Curing Agent ◽  
Self Healing ◽  
Healing Agent ◽  
The Impact

Microencapsulated E-51 epoxy resin healing agent and phthalic anhydride latent curing agent were incorporated into E-44 epoxy matrix to prepare self-healing epoxy composites. When cracks were initiated or propagated in the composites, the microcapsules would be damaged and the healing agent released. As a result, the crack plane was healed through curing reaction of the released epoxy latent curing agent. In the paper, PUF/E-51 microcapsules were prepared by in-situ polymerization. The mechanical properties of the epoxy composites filled with the self-healing system were evaluated. The impact strength and self-healing efficiency of the composites are measured using a Charpy Impact Tester. Both the virgin and healed impact strength depends strongly on the concentration of microcapsules added into the epoxy matrix. Fracture of the neat epoxy is brittle, exhibiting a mirror fracture surface. Addition of PUF/E-51 microcapsules decreases the impact strength and induces a change in the fracture plane morphology to hackle markings. In the case of 8.0 wt% microcapsules and 3.0 wt% latent hardener, the self-healing epoxy exhibited 81.5% recovery of its original fracture toughness.

MECHANICAL PROPERTIES AND SURFACE FREE ENERGY OF OIL PALM EMPTY FRUIT BUNCHES FIBRE REINFORCED BIOCOMPOSITES AS GLASS FIBRE SUBSTITUTION

2017 ◽  
Vol 79 (4) ◽  
Author(s):  
Gema Sukmawati Suryadi ◽  
Siti Nikmatin ◽  
Sudaryanto Sudaryanto ◽  
Irmansyah Irmansyah
Keyword(s):  
Mechanical Properties ◽  
Free Energy ◽  
Impact Strength ◽  
Surface Free Energy ◽  
Glass Fibre ◽  
Oil Palm ◽  
Short Fibre ◽  
Filler Materials ◽  
Empty Fruit Bunches ◽  
The Impact

Study of the size effect of natural fibre from oil palm empty fruit bunches (OPEFB) as filler, onto the mechanical and physical properties of fibre reinforced biocomposites based on recycled Acrylonitrile Butadiene Styrene (ABS) has been done. The OPEFB fibres were prepared by mechanical milling and sieving to obtain medium-fibre (20 mesh) and short-fibre (100 mesh). The biocomposites have been produced by extrusion using single-screw extruder method. Mechanical properties and S of biocomposites were evaluated and compared with glass fibre (GF) filled composite which is commonly used in plastics industrial applications. The result showed that the impact strength increased with the decreasing of OPEFB fibre size, while the Young’s modulus decreased. Other mechanical properties of biocomposites with short-fibre (RABS/SF) and medium-fibre (RABS/MF) filler were not significantly different at 95% confidence interval. Impact strength of short-fibre filled biocomposite was higher than glass fibre filled composites. The surface free energy of biocomposites lower than glass fibre filled composites, but its dispersive components are higher, indicating more hydrophobic feature of the surface. The fabricated micro-fibre of OPEFB can be used as viable alternative to substitute glass fibre as filler materials of composites.

scholarly journals Ultraviolet curing of Glass Fibre Reinforced Polyester Composites

2000 ◽  
Vol 9 (5) ◽  
pp. 096369350000900 ◽  
Author(s):  
Qiang Yuan ◽  
Ming-Bao Yang ◽  
Yiu-Wing Mai
Keyword(s):  
Glass Fibre ◽  
Impact Damage ◽  
Cost Effective ◽  
Ultraviolet Curing ◽  
Fibre Composites ◽  
Glass Fibre Reinforced ◽  
Light Curing ◽  
Polyester Composites ◽  
Laminate Thickness ◽  
The Impact

Light curing of fibre composites was studied to explore its usefulness as a cost-effective production technique without unacceptable sacrifices of mechanical properties. Knitted continuous glass fibre reinforced polyester composites were cured by ultraviolet light and vacuum bag resin infusion (VBRI). A maximum thickness of 13 mm could be achieved with this technique. The compressive strength was shown to be independent of laminate thickness; but both the flexural strength and modulus were reduced with increasing thickness of laminate. The impact damage was also studied using drop-weight impact tests. For the same impact energy imposed on the laminates, the delamination areas decreased with laminate thickness.

scholarly journals Impact Strength of Austenitic and Ferritic-Austenitic Cr-Ni Stainless Cast Steel in -40 and +20°C Temperature

2014 ◽  
Vol 59 (3) ◽  
pp. 1103-1106
Author(s):  
B. Kalandyk ◽  
R. Zapała ◽  
Ł. Boroń ◽  
M. Solecka
Keyword(s):  
Impact Strength ◽  
Volume Fraction ◽  
Cast Steel ◽  
Testing Machine ◽  
Charpy Impact ◽  
Impact Testing ◽  
Two Phase ◽  
Steel Grades ◽  
Charpy Impact Testing ◽  
The Impact

Abstract Studies described in this paper relate to common grades of cast corrosion resistant Cr-Ni steel with different matrix. The test materials were subjected to heat treatment, which consisted in the solution annealing at 1060°C followed by cooling in water. The conducted investigations, besides the microstructural characteristics of selected cast steel grades, included the evaluation of hardness, toughness (at a temperature of -40 and +20oC) and type of fracture obtained after breaking the specimens on a Charpy impact testing machine. Based on the results of the measured volume fraction of ferrite, it has been found that the content of this phase in cast austenitic steel is 1.9%, while in the two-phase ferritic-austenitic grades it ranges from 50 to 58%. It has been demonstrated that within the scope of conducted studies, the cast steel of an austenitic structure is characterised by higher impact strength than the two-phase ferritic-austenitic (F-A) grade. The changing appearance of the fractures of the specimens reflected the impact strength values obtained in the tested materials. Fractures of the cast austenitic Cr-Ni steel obtained in these studies were of a ductile character, while fractures of the cast ferritic-austenitic grade were mostly of a mixed character with the predominance of brittle phase and well visible cleavage planes.

TESTING METHOD FOR MEASURING IMPACT STRENGTH OF BGA SOLDER JOINTS ON ELECTRONIC PACKAGE

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1050-1055
Author(s):  
TADAHARU ADACHI ◽  
HIROTAKA GOTO ◽  
WAKAKO ARAKI ◽  
TAKAHIRO OMORI ◽  
NORIYASU KAWAMURA ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Impact Strength ◽  
Solder Joints ◽  
Testing Machine ◽  
Load Cell ◽  
Impact Testing ◽  
Circuit Board ◽  
Rear Side ◽  
Electronic Package ◽  
The Impact

A pendulum-impact testing machine was developed to measure the impact strength of ball-grid-array (BGA) solder joints between an electronic package and a circuit board. Ball solders were connected to daisy-chain between a dummy electronic package and a circuit board. The upper side of the package was directly bonded to a load cell. The rear side of the circuit board was also bonded to an aluminum alloy block fixed on a base. A pendulum made of aluminum alloy was collided into the load cell to apply tensile impact to the solder joints through the load cell. The history of the impact load could be controlled by raising the angle of the pendulum. The fracture of a BGA solder joint was detected by measuring the resistance of the daisy-chain circuit on the board. Therefore, the impact strengths of the solder joints at electrical disconnection and mechanical breaking of all joints could be determined. The experimental results showed that this method is useful for measuring the impact strength of BGA solder joints.

Assessment of the mechanical behaviour of glass fibre composites with a tough polydicyclopentadiene (PDCPD) matrix

2015 ◽  
Vol 78 ◽  
pp. 191-200 ◽  
Author(s):  
Katleen A.M. Vallons ◽  
Renata Drozdzak ◽  
Mathieu Charret ◽  
Stepan V. Lomov ◽  
Ignaas Verpoest
Keyword(s):  
Glass Fibre ◽  
Mechanical Behaviour ◽  
Fibre Composites

scholarly journals Impact Strength of Hybrid Epoxy–Basalt Composites Modified with Mineral and Natural Fillers

2021 ◽  
Vol 5 (3) ◽  
pp. 56
Author(s):  
Danuta Matykiewicz ◽  
Mateusz Barczewski ◽  
Marwan Suleiman Mousa ◽  
Mavinkere Rangappa Sanjay ◽  
Suchart Siengchin
Keyword(s):  
Impact Strength ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Basalt Fiber ◽  
Fiber Reinforced Composites ◽  
Maximum Force ◽  
Reinforced Composites ◽  
The Impact ◽  
Natural Fillers ◽  
Natural Additives

The aim of this study was to evaluate the influence of mineral and natural additives (2.5; 5; 10 wt.%) on the impact strength of epoxy–basalt composites. Three types of filler were used to modify the epoxy matrix: basalt powder (BP), basalt microfiber (BF) and sunflower husk ash (SA). The impact strength and the maximum force were determined for the materials. The results of the conducted research confirm that the addition of a powder fillers to the epoxy matrix of basalt fiber reinforced composites is an effective method of improving their impact characteristic. The introduction of fillers to epoxy resin allowed to improve the impact properties of all tested groups of laminates. Moreover, in all cases, the introduction of the filler increased the maximum force needed to damage the composite sample and their hardness. For the modified materials, an increase in impact strength was recorded, respectively: by 44% for composites with BP, by 7.5% for composites with BF and by 2.5% for composites with SA.

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