scholarly journals Effect of Interfacial Structure on Mechanical Properties of Graphene Reinforced Al2O3–WC Matrix Ceramic Composite

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1374
Author(s):  
Xuchao Wang ◽  
Jun Zhao ◽  
Enzhao Cui ◽  
Xianhua Tian ◽  
Zhefei Sun
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Interfacial Adhesion ◽  
Ceramic Composite ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Adhesion Energy ◽  
Interfacial Structure ◽  
Interfacial Structures ◽  
Interfacial Adhesion Energy

The interfacial structures and interfacial bonding characteristics between graphene and matrix in graphene-reinforced Al2O3–WC matrix ceramic composite prepared by two-step hot pressing sintering were systematically investigated. Three interfacial structures including graphene–Al2O3, graphene–Al2OC and graphene-WC were determined in the Al2O3–WC–TiC–graphene composite by TEM. The interfacial adhesion energy and interfacial shear strength were calculated by first principles, and it has been found that the interfacial adhesion energy and interfacial shear strength of the graphene–Al2OC interface (0.287 eV/nm2, 59.32 MPa) were far lower than those of graphene–Al2O3 (0.967 eV/nm2, 395.77 MPa) and graphene–WC (0.781 eV/nm2, 229.84 MPa) interfaces. Thus, the composite with the strong and weak hybrid interfaces was successfully obtained, which was further confirmed by the microstructural analysis. This interfacial structure could induce strengthening mechanisms such as load transfer, grain refinement, etc., and toughening mechanisms such as crack bridging, graphene pull-out, etc., which effectively improved mechanical properties.

scholarly journals Study on the Static Performance of Prefabricated UHPC-Steel Epoxy Bonding Interface

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yang Zou ◽  
Jinlong Jiang ◽  
Zhixiang Zhou ◽  
Xifeng Wang ◽  
Jincen Guo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Strength ◽  
Shear Test ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Bonding Interface ◽  
Tensile Shear ◽  
Epoxy Bonding ◽  
Shear Coupling

Prefabricated UHPC-steel composite structure can make full use of the two materials’ mechanical and construction performance characteristics, with super mechanical properties and durability, which has been proved to be a very promising structure. However, using traditional mechanical connectors to connect prefabricated UHPC and steel not only is inconvenient for the prefabrication of UHPC components but also introduces heavy welding work, which is detrimental to the construction speed and antifatigue performance of the composite structure. Bonding UHPC-steel interface with epoxy adhesive is a potential alternative to avoid the above problem. In order to explore the mechanical properties of the prefabricated UHPC-steel epoxy bonding interface, this study carried out the direct shear test, tensile test, and tensile-shear test of the UHPC-steel epoxy-bonded interface (prefabricated UHPC-steel epoxy bonding interface). The results show that the interface failure is mainly manifested as the peeling of the epoxy-UHPC interface and the destruction of part of the UHPC matrix (the failure of the UHPC's surface). In pure shear and pure tension state, the interfacial shear strength is 5.14 MPa and the interfacial tensile strength is 1.18 MPa. In the tensile-shear state, the interfacial shear strength is 0.61 MPa and the interfacial tensile strength is 1.06 MPa. The stress-displacement curves of the interface normal and tangential direction are all in the shape of a two-fold line. The ultimate displacement was within 0.1 mm, showing the characteristics of brittle failure. Finally, a numerical model of the tensile specimen is established based on the cohesive interface element, and the interfacial tensile-shear coupling failure mechanism (tensile-shear coupling effect) is analyzed.

scholarly journals Analysis of the Interfacial Adhesion between a Stainless-Steel Fiber and an Epoxy Resin by the Single Fiber Microdroplet Test

Surfaces ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 594-604
Author(s):  
MiYeon Kwon ◽  
Seung Goo Lee
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Acid Treatment ◽  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Steel Fiber ◽  
Interfacial Shear ◽  
Steel Fibers ◽  
Stainless Steel Fiber

In this study, the surfaces of the stainless-steel fibers of the kind primarily utilized in fiber-reinforced composite materials were modified by an acid treatment to increase the interfacial adhesion between the fibers and epoxy resins in composite materials. The interfacial shear strength between the resins and acid-treated fibers was determined by a single fiber microdroplet test, where the resin droplet was located at the center of the fiber. The etching effect at the surface of the fibers increased with the increase in the acid-treatment time. The interfacial shear strength between the stainless-steel fiber and epoxy resin increased with the increase in the specific surface area of contact between the fiber and resin. Furthermore, there was no significant deterioration in the mechanical properties of the stainless-steel fibers with the increase in the surface etching effect. The modification of the surfaces of the stainless-steel fibers by the acid treatment resulted in an increase in the interfacial shear strength between the fibers and resins. Thus, this study demonstrated the possibility of widening the scope of the applications of stainless-steel fiber/epoxy resin composites.

Interfacial Shear Strength of Polylactic Acid-Kenaf Fibre Biocomposites

2011 ◽  
Vol 471-472 ◽  
pp. 781-785 ◽  
Author(s):  
Hazleen Anuar ◽  
Ahmad Zuraida ◽  
Bálint Morlin ◽  
József Gábor Kovács
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Polylactic Acid ◽  
Interfacial Shear Strength ◽  
Tensile Tests ◽  
Natural Fibre ◽  
Interfacial Shear ◽  
Fibre Properties ◽  
Kenaf Fibre

This paper reported the interfacial shear strength (IFSS) between kenaf fibre (KF) and polylactic acid (PLA) matrix which was measured using microbond tests device. The value of IFSS obtained in PLA-KF is comparable to other polymer with natural fibre reinforcements. The properties of single kenaf fibre was determined from tensile tests and also described in this paper. From single kenaf fibre properties, various mechanical properties can be estimated for various applications.

scholarly journals Effect of nanoclay (Kaolinite) on mechanical properties of epoxy-fiber composite

2020 ◽  
Vol 12 (01) ◽  
pp. 38-43
Author(s):  
Hisham M Hasan ◽  
◽  
Ahmed R Majeed ◽  
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Shear Strength ◽  
Tensile Test ◽  
Carbon Fibers ◽  
Epoxy Matrix ◽  
Interfacial Shear Strength ◽  
Fiber Composite ◽  
Weight Fraction ◽  
Interfacial Shear

An experimental investigation using drag-out tensile test to calculate the interfacial shear strength for different embedded lengths of Kevlar and carbon fibers reinforced epoxy matrix with nanoclay (kaolinite) for different ratio weight, the interfacial shear strength increased by with increasing of embedded length and ratio weight fraction of nanoclay that adding to epoxy matrix.

Effects of Temperature on the Fibre Matrix Interfacial Shear Strength of Carbon Nanotube Grafted Carbon Fibre Reinforced Heat Resistant Resin

2019 ◽  
Vol 827 ◽  
pp. 488-492
Author(s):  
Kazuto Tanaka ◽  
Daiki Kugimoto ◽  
Tsutao Katayama
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Pull Out ◽  
Significant Difference ◽  
Effects Of Temperature ◽  
Structural Parts ◽  
Fibre Matrix

Transportation sector is required to reduce CO2 emissions as environmental problems are becoming more serious. Carbon fibre reinforced thermoplastic (CFRTP) are expected to be applied to the structural parts of automobiles and aircrafts because of their superior mechanical properties such as high specific strength, high specific stiffness and high recyclability. One of the problems in using CFRTP for the structural parts is heat resistance, and it is necessary to clarify the mechanical properties under their service environmental temperature. The tensile strength of CFRTP at high temperatures decreases with temperature rise. The fibre matrix interfacial shear strength is reported to be improved by grafting of carbon nanotubes (CNTs) on the surface of carbon fibre. In this study, in order to clarify the effects of temperature on the fibre matrix interfacial shear strength of CNTs grafted carbon fibre reinforced PPS resin, single fibre pull-out test was conducted. While the interfacial shear strength of CNT grafted-CF/PPS is higher than that of As-received-CF/PPS at 25 °C, no significant difference was found in the interfacial shear strength of As-received-CF/PPS and CNT grafted-CF/PPS at 80 °C.

Microdebond test development and interfacial shear strength evaluation of basalt and glass fibre reinforced polypropylene composites

2017 ◽  
Vol 51 (29) ◽  
pp. 4091-4099 ◽  
Author(s):  
R Zykaite ◽  
B Purgleitner ◽  
W Stadlbauer ◽  
C Burgstaller
Keyword(s):  
Shear Strength ◽  
Glass Fibre ◽  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Fibre Surface ◽  
Interfacial Shear ◽  
Basalt Fibre ◽  
Polypropylene Composites ◽  
Loading Rates ◽  
Glass Fibre Reinforced

Interfacial adhesion of basalt and glass fibre reinforced polypropylene composites was studied using microdebond testing technique. A focus was put on a simple approach of applying extruded thermoplastic films as a matrix material for microdroplet formation. The ability of different viscosity and thickness polypropylene films to form symmetrical droplets under a temperature range of 200–240℃ was evaluated. Emphasis was put on polypropylene matrix chemistry, silane fibre surface treatment and testing loading rate impact on interfacial performance change in polypropylene-basalt fibre and polypropylene-glass fibre microcomposites. It was found that it was possible to obtain high symmetrical droplet yield out of polypropylene films of melt flow rate 50 and 125 g/10 min and 55–85 µm thickness at 240℃. The presence of maleic anhydride grafted polypropylene coupling agent increased the interfacial shear strength significantly. Microcomposites with glass fibre had higher interfacial shear strength in comparison with the used basalt fibre, mainly due to the difference in their sizing. Various silane-based fibre surface coatings did not result in significant interfacial adhesion changes. Polypropylene-glass fibre microcomposite interfacial shear strength at 0.5, 3.0 and 10.0 mm min–1 loading rates had similar values with high maximum pull-out force scatter at 0.5 and 3.0 mm min–1 loading rates and low scatter at 10.0 mm min–1.

scholarly journals Micro- and Macromechanical Properties of a Composite with a Ternary PLA–PCL–TPS Matrix Reinforced with Short Fique Fibers

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 58 ◽  
Author(s):  
José H. Mina ◽  
Alex Valadez González ◽  
Mario F. Muñoz-Vélez
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Thermoplastic Starch ◽  
Interfacial Shear ◽  
Weak Interface ◽  
Composite Matrix ◽  
Pull Out ◽  
Matrix Yielding ◽  
Fique Fibers

Biocomposites were prepared from a ternary matrix of polylactic acid (PLA), polycaprolactone (PCL), and thermoplastic starch (TPS) and reinforced with native fique fibers from southwestern Colombia. The influence of surface modification by alkalization of fique fibers on the interfacial properties of the biocomposite was studied using pull-out tests. Additionally, the effect of short fique fibers in three proportions (10%, 20%, and 30% (w/w)) on the tensile mechanical properties of the composite was evaluated. The experimental results indicated that the interfacial shear strength (IFSS) of the ternary matrix was predominantly influenced by PCL and characterized by the development of a weak interface that failed due to matrix yielding. Furthermore, the incorporation of short fique fibers increased the elastic modulus of the composite to values similar to those estimated with the Tsai–Pagano model. The alkalization treatment of the fique fibers improved the interface with the composite matrix, and this phenomenon was evidenced by the results of the micromechanical and tensile characterizations of the composite.

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