Defect and its Influence on Mechanical Property of Titanium Diboride-Copper Matrix Composite

2007 ◽  
Vol 336-338 ◽  
pp. 1414-1416 ◽  
Author(s):  
Li Xu ◽  
Jie Cai Han ◽  
Xing Hong Zhang
Keyword(s):  
Mechanical Properties ◽  
Test Sample ◽  
Copper Matrix ◽  
Bending Test ◽  
Ceramic Phase ◽  
Copper Matrix Composite ◽  
Main Defect ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

The TiB2-40Cu-8Ni composite prepared by combustion synthesis is investigated. Both 2D digital radiography (DR) and 3D computed tomography (CT) are used to test the specimens nondestructively. The result shows that ceramic phase aggregation is the main defect. Then the mechanical properties of samples are assessed by means of three-point-bend test. It appears that mechanical properties are related with the distribution of TiB2 phase and Cu phase. The scanning electron microscope (SEM) is also used to observe the crack growth of the bending test sample.

FEM Modelling Techniques for Three Point Bend Test of Rubber Composites

2018 ◽  
Vol 919 ◽  
pp. 257-265 ◽  
Author(s):  
Jan Kledrowetz ◽  
Jakub Javořík ◽  
Rohitha Keerthiwansa ◽  
Pavel Nekoksa
Keyword(s):  
Test Sample ◽  
Bend Test ◽  
Rubber Matrix ◽  
Vertical Force ◽  
The Matrix ◽  
Composite Models ◽  
Modelling Techniques ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

This paper studies different modelling methodologies for a calculation of the three point bend test. Test samples are composed of a rubber matrix and either steel or textile cords reinforcement. Prior to the bending tests, all of the used materials including the matrix and the reinforcement were measured to find out their mechanical properties. Rubber materials were described using hyperelastic models. FEM software MSC Marc/Mentat is employed as a calculation tool and its various functionalities are utilized for a description of the test composite models. The main observed outcome is a dependence of the vertical force causing the test sample deformation on the amount of the deformation. Calculated results are compared to each other and to measurements. Then, all the modelling techniques are evaluated.

Annealing effects on the elastic modulus of tungsten oxide nanowires

2008 ◽  
Vol 23 (8) ◽  
pp. 2149-2156 ◽  
Author(s):  
Yanwu Zhu ◽  
Yousheng Zhang ◽  
Fook-Chiong Cheong ◽  
Chorng-Haur Sow ◽  
Chwee-Teck Lim
Keyword(s):  
Mechanical Properties ◽  
Tungsten Oxide ◽  
Bend Test ◽  
Tem Analysis ◽  
Oxide Nanowires ◽  
Young’S Moduli ◽  
Annealing Effects ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

Three-point bend test coupled with transmission electron microscopy (TEM) analysis was carried out on individual tungsten oxide nanowires (NWs) before and after annealing. Three-point bend test monitors the change in the Young’s modulus of the NW after annealing, while TEM provides nanostructural detail changes on the same NW. In this way, insight into the correlation between the mechanical properties of a NW and its nanostructure details can be obtained. Annealing increased the diameter of the NWs by forming a uniform amorphous/polycrystalline outer coating. The coating results in a decrease in Young’s moduli for thicker NWs. On the other hand, annealing led to increased Young’s moduli of thinner NWs, which is attributed to the improved crystallinity in these NWs after annealing. This study points to a more refined strategy for more in-depth understanding of the relationship between the nanostructures and elastic mechanical properties of NWs.

scholarly journals Synergistic strengthening mechanism of copper matrix composite reinforced with nano-Al2O3 particles and micro-SiC whiskers

2021 ◽  
Vol 10 (1) ◽  
pp. 62-72
Author(s):  
Huanran Lin ◽  
Xiuhua Guo ◽  
Kexing Song ◽  
Jiang Feng ◽  
Shaolin Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Erosion Resistance ◽  
Strengthening Mechanism ◽  
Copper Matrix ◽  
Heavy Duty ◽  
Arc Erosion ◽  
Comprehensive Performance ◽  
Sic Whiskers ◽  
Copper Matrix Composite ◽  
Time And Energy

Abstract Although Cu–Al2O3 composites have good comprehensive performance, higher mechanical properties and arc erosion resistance are still required to meet heavy-duty applications such as electromagnetic railguns. In this work, a novel hybrid SiCw/Cu–Al2O3 composite was successfully prepared by combining powder metallurgy and internal oxidation. The microstructure and mechanical behavior of the SiCw/Cu–Al2O3 composite were studied. The results show that nano-Al2O3 particles and micro-SiCw are introduced into the copper matrix simultaneously. Well-bonded interfaces between copper matrix and Al2O3 particles or SiCw are obtained with improved mechanical and arc erosion resistance of SiCw/Cu–Al2O3 composite. The ultimate tensile strength of the SiCw/Cu–Al2O3 composite is 508.9 MPa, which is 7.9 and 56.1% higher than that of the Cu–Al2O3 composite and SiCw/Cu composite, respectively. The strengthening mechanism calculation shows that Orowan strengthening is the main strengthening mechanism of the SiCw/Cu–Al2O3 composite. Compared with Cu–Al2O3 composite, the hybrid SiCw/Cu–Al2O3 composite has lower arc time and energy and better arc stability.

scholarly journals Mechanical Performance of Honeycomb Sandwich Structures Using Three-Point Bend Test

2019 ◽  
Vol 9 (2) ◽  
pp. 3955-3958
Author(s):  
T. Subhani
Keyword(s):  
Mechanical Performance ◽  
Sandwich Structures ◽  
Bend Test ◽  
Core Material ◽  
Honeycomb Core ◽  
Adhesive Film ◽  
Honeycomb Sandwich ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

In this study, honeycomb sandwich structures were prepared and tested. Facesheets of sandwich structures were manufactured by carbon fiber epoxy matrix composites while Nomex® honeycomb was used as core material. An epoxy-based adhesive film was used to bond the composite facesheets with honeycomb core. Four different curing temperatures ranging from 100oC to 130oC were applied with curing times of 2h and 3h. Three-point bend test was performed to investigate the mechanical performance of honeycomb sandwich structures and thus optimize the curing parameters. It was revealed that the combination of a temperature of 110oC along with a curing time of 2h offered the optimum mechanical performance together with low damage in honeycomb core and facesheets.

scholarly journals Influence of Phase Composition on Sintered Microstructure of Combustion Synthesized Oxides

2007 ◽  
Vol 2007 ◽  
pp. 1-5
Author(s):  
Ibram Ganesh ◽  
J. M. F. Ferreira
Keyword(s):  
Composite Powder ◽  
Single Phase ◽  
Absorption Capacity ◽  
Synthesis Methods ◽  
Water Absorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

The effects of powders synthesis methods (urea-combustion synthesis (CS) and conventional solid-state (SS) reaction) on the sintering ability, microstructural features, and mechanical properties ofAl2O3,MgAl2O4spinel, and 20 wt.% ZrO2–MgAl2O4upon sintering at 1625C∘were investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), relative density (RD), apparent porosity and water absorption capacity, hardness, fracture toughness, and three-point bend test studies revealed the superior sintering ability of CS ZrO2-MgAl2O4composite powder as compared with one prepared by SS reaction. In contrast, single-phase powders obtained by SS reaction exhibit superior sintering ability over CS synthesized ones. The reasons for differences observed are discussed along this paper.

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