Mechanical Properties of MWCNT Modified Syntactic Foams with High Volume Fraction of Glass Microspheres

2014 ◽  
Vol 1000 ◽  
pp. 122-125 ◽  
Author(s):  
Martina Drdlová ◽  
Michal Frank ◽  
Jaroslav Buchar ◽  
Josef Krátký
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Volume Fraction ◽  
Syntactic Foam ◽  
High Volume ◽  
High Volume Fraction ◽  
Syntactic Foams ◽  
Glass Microspheres ◽  
Multi Wall Carbon Nanotubes

The effect of multi-wall carbon nanotubes content on physico-mechanical properties of glass microspheres-epoxy resin syntactic foam was evaluated experimentally. Syntactic foam with high volume fraction of microspheres (70 vol%) was prepared and modified by 1 to 5 vol% of multi-wall carbon nanotubes. The compressive, flexural and impact strength tests were conducted, the load-displacement curves were captured. The quality of dispersion of nanoparticles was evaluated in relation to the mixing procedure using scanning electron microscope observation.

Evaluation of Mechanical Properties of Glass/Epoxy Syntactic Foams Containing Carbon Nanotubes and Nanosilica

2015 ◽  
Vol 1124 ◽  
pp. 51-56 ◽  
Author(s):  
Martina Drdlová ◽  
Michal Frank ◽  
Jaroslav Buchar ◽  
Radek Řídký
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Volume Fraction ◽  
Resin Composite ◽  
High Volume ◽  
Significant Drop ◽  
Multi Wall Carbon Nanotubes ◽  
Blast Energy

The effect of multi-wall carbon nanotubes and nanoSiO2content on physico-mechanical properties of glass microspheres-epoxy resin composite, designed for blast energy absorbing applications, was evaluated experimentally. Specific porous lightweight foam with high volume fraction of microspheres (70 vol.%) was prepared and modified by 1 to 5 vol.% of multi-wall carbon nanotubes and nanosilica (nanoSiO2). Two types of microsperes with different wall thickness and strength were used. The quality of dispersion of nanoparticles was evaluated in relation to the mixing procedure using scanning electron microscope observation. The compressive and flexural strength tests were conducted at quasi-static load. The mixtures containing nanosilica exhibited an increasing trend in both flexural and compressive strength with increasing nanoparticle content up to 4 vol.%. The addition of carbon nanotubes also increased flexural strength (again up to 4 vol%, crossing this concentration, the significant drop was observed), whereas the compressive strength was affected at lower level. Nanoparticle modification is more effective in the foams with higher thickness and thus strength. The evaluation of test results showed that the properties of glass/epoxy foams can be tailored by adding nanoscale fillers.

scholarly journals Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Xu Zhao ◽  
Yadong Gong ◽  
Guiqiang Liang ◽  
Ming Cai ◽  
Bing Han
Keyword(s):  
Friction Coefficient ◽  
Surface Morphology ◽  
Surface Quality ◽  
Volume Fraction ◽  
High Volume ◽  
Spindle Speed ◽  
High Volume Fraction ◽  
Machining Parameters ◽  
Al Composite

AbstractThe existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study, 32 SiCp/Al specimens with a high volume fraction were prepared and their machining parameters measured. The surface quality of the specimens was then tested and the effect of the grinding parameters on the surface quality was analyzed. The grinding quality of the composite specimens was comprehensively analyzed taking the grinding force, friction coefficient, and roughness parameters as the evaluation standards. The best grinding parameters were obtained by analyzing the surface morphology. The results show that, a higher spindle speed should be chosen to obtain a better surface quality. The final surface quality is related to the friction coefficient, surface roughness, and fragmentation degree as well as the quantity and distribution of the defects. Lower feeding amount, lower grinding depth and appropriately higher spindle speed should be chosen to obtain better surface quality. Lower feeding amount, higher grinding depth and spindle speed should be chosen to balance grind efficiently and surface quality. This study proposes a systematic evaluation method, which can be used to guide the machining of SiCp/Al composites with a high volume fraction.

High volume fraction and uniform dispersion of carbon nanotubes in aluminium powders

2010 ◽  
Vol 5 (6) ◽  
pp. 379 ◽  
Author(s):  
Zhiqiang Li ◽  
Lin Jiang ◽  
Genlian Fan ◽  
Yong Xu ◽  
Di Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Uniform Dispersion

scholarly journals Study on Meso-scale Grinding Surface Roughness and Sub-surface Quality of High Volume Fraction SiCp/Al2024 composites

2021 ◽  
Author(s):  
Guangyan Guo ◽  
Qi Gao ◽  
Quanzhao Wang ◽  
Yuanhe Hu
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
High Volume ◽  
High Volume Fraction ◽  
Aluminum Matrix Composites ◽  
Sic Particles ◽  
Meso Scale

Abstract In order to improve the surface grinding quality of high volume fraction aluminum matrix composites, the cutting tool models with different rake angles are established, the grinding process is simulated, and the material removal mechanism and the broken state of SiC particles are obtained. Through single factor experiment, the 60% volume fraction SiCp/Al2024 composites are ground by diamond grinding rod with 3mm diameter, the surface roughness (Ra) is measured, and the surface and sub-surface quality of SiCp/Al2024 composites with meso-scale grinding is investigated. Meanwhile, the influence mechanism of grinding depth (ap) on surface quality is put forward, and the influence of different grinding depth on the fragmentation of SiC particles in sub-surface layer is discussed, which verifies the correctness of grinding simulation. The relevant research and theoretical model are of great significance to the study of grinding properties of composite materials.

Study on Removal Mechanism and Surface Quality of High Volume Fraction SiCp/Al Composites Based on Meso-scale

2021 ◽  
Author(s):  
Po Jin ◽  
Qi Gao ◽  
Quanzhao Wang ◽  
Wenbo Li
Keyword(s):  
Particle Size ◽  
Surface Quality ◽  
Feed Rate ◽  
Volume Fraction ◽  
High Volume ◽  
Milling Process ◽  
Subsurface Damage ◽  
High Volume Fraction ◽  
Removal Mechanism

Abstract The milling process of SiCp/Al composites with high volume fraction and large particle size has been studied in this paper. The stress and strain distribution of SiC reinforced particles and the removal mechanism of the material are analysed. The effects of milling depth and feed per tooth on surface quality were analysed. The effect of feed per tooth on the thickness of subsurface damage layer is revealed. The results show that in the end milling process of high volume fraction SiCp/Al composites, the blade diameter is larger relative to the particle size, which leads to the main removal forms of particle size: extrusion crushing and rolling crushing. The surface defects of the machined workpiece mainly include cavity, crack and delamination caused by extrusion of aluminum matrix. The surface quality of the machined workpiece can be improved by increasing the milling depth appropriately. The increase of the feed rate of each tooth will lead to the increase of the surface defect of the machined workpiece and the deterioration of the surface quality. When the feed rate per tooth increases from 4 to 8 μm, the thickness of subsurface damage increases from 47.7 to 60.5 μm. It is found that the ratio between the minimum cutting thickness of SiCp/Al composites and the radius of the cutting edge should be less than or equal to 4%.

Sign in / Sign up

Export Citation Format

Share Document