scholarly journals Microstructural characterization of glass-epoxy composites subjected to tensile testing

2013 ◽  
pp. 151-162 ◽  
Author(s):  
Jelena Petrovic ◽  
Dragoljub Bekric ◽  
Ivica Vujicic ◽  
Ivana Dimic ◽  
Slavisa Putic
Keyword(s):  
Tensile Testing ◽  
Room Temperature ◽  
Epoxy Composite ◽  
Microstructural Characterization ◽  
Mechanical Analysis ◽  
Destruction Process ◽  
Tension Properties ◽  
Statistical Mechanical ◽  
Electronic Microscope

The main objective of the research presented in this paper was to carry out a statistical-mechanical analysis concerning the tensile test of glass-epoxy composite materials in order to calculate their relevant tension properties and micromechanical structure destruction process. The analysis was done at room temperature, and its results were derived based on the structure of the glass woven 280 g/m?, ?twill texture? with the width value of 100 cm, type - Interglass 92125, and epoxy resin type MGS L 135. Samples were shaped by hands with 35% of fabric volume part. The consumed portion of resin was 220 g/m?, the thickness of the laminate was 0.308 mm, and the mass of the laminate was 500 g/m2. There were a total of eight layers built in the panel. The micromechanical analysis was derived from the crack surfaces data collected on a scanning electronic microscope, and it showed the mechanisms of damage, and development of cracks until the occurrence of the final break under the tension load.

Synthesis and Characterization of Carbon Nitride Thin Film with Evidence of Nanodomes

2004 ◽  
Vol 843 ◽  
Author(s):  
S. Chowdhury ◽  
M. T. Laugier
Keyword(s):  
Thin Film ◽  
Deposition Temperature ◽  
Carbon Nitride ◽  
Room Temperature ◽  
Electrical Characterization ◽  
Microstructural Characterization ◽  
Rf Magnetron Sputtering ◽  
Synthesis And Characterization ◽  
Sputtering System

ABSTRACTWe have reported the synthesis of carbon nitride thin films with evidence of formation of carbon nanodomes over a range of substrate temperature from 50 °C to 550 °C. An RF magnetron sputtering system was used for depositing carbon nitride films. The size of the nanodomes can be controlled by deposition temperature and increases from 40–80 nm at room temperature to 200–400 nm at high temperature (550 °C). Microstructural characterization was performed by AFM. Electrical characterization shows that these films have conductive behaviour with a resistivity depending on the size of the nanodomes. Resistivity values of 20 mΩ-cm were found for nanodomes of size 40–80 nm falling to 6 m?-cm for nanodomes of size 200–400 nm. Nanoindentation results show that the hardness and Young's modulus of these films are in the range from 9–22 GPa and 100–168 GPa respectively and these values decrease as the size of the nanodomes increases. GXRD results confirm that a crystalline graphitic carbon nitride structure has formed.

Effect of Sintering Temperature in Physical-Mechanical Behaviour and in Titanium-Hydroxyapatite Composite Sinterability

2006 ◽  
Vol 530-531 ◽  
pp. 249-254 ◽  
Author(s):  
W.R. Weinand ◽  
F.F.R. Gonçalves ◽  
W.M. Lima
Keyword(s):  
Room Temperature ◽  
Milling Time ◽  
Sintering Temperature ◽  
Microstructural Characterization ◽  
Thermal Treatments ◽  
X Ray ◽  
Hydroxyapatite Composite ◽  
Atmosphere Control ◽  
Ti Powder ◽  
Electronic Microscope

Mechanical alloying (MA) has been successfully used to produce alloys and composites with a high homogeneity degree. In current research, titanium (Ti) powder was mixed with 40, 50% volume of hydroxyapatite (HAp). MA was performed without atmosphere control, at room temperature, for 4.5 hours of milling time, at rotation speed of 300 rpm. Samples of material were compacted in cylindrical form at 350 MPa and sintered in 2.0 flux air (l/min) at 1000, 1100 and 1200oC during 1 hr. The material’s morphological and microstructural characterization, in powder form and in sintered material, was performed by scanning electronic microscope and X-ray diffractometry. Thermal treatments revealed that sintering temperature affects the microstructure, microhardness and the composition of the composites evaluated by EDS.

Microstructure and microtexture of a Nb-16%Si (DS) Alloy

1995 ◽  
Vol 53 ◽  
pp. 122-123
Author(s):  
J. A. Sutliff ◽  
B. P. Bewlay
Keyword(s):  
High Temperature ◽  
Directional Solidification ◽  
Room Temperature ◽  
Microstructural Characterization ◽  
Crystallographic Analysis ◽  
Directionally Solidified ◽  
Heat Treated ◽  
Other Orientation

In-situ composite Nb-Si alloys have been studied by several investigators as potential high temperature structural materials. The two major processing routes used to fabricate these composites are directional solidification and extrusion of arc-cast solidified ingots. In both cases a stable microstructure of primary Nb dendrites in a eutectoid of Nb and Nb5Si3 phases is developed after heat treatment. The Nb5Si3 phase is stable at room temperature and forms as a decomposition product of the high temperature Nb3Si phase. The anisotropic microstructures developed by both directional solidification and extrusion require evaluation of the texture to fully interpret the fracture and other orientation dependent mechanical behavior of these composites.In this paper we report on the microstructural characterization of a directionally solidified (DS) and heat treated Nb-16 at.%Si alloy. The microtexture of each of the phases (Nb, Nb5Si3) was determined using the Electron BackScattering Pattern (EBSP) technique for electron diffraction in the scanning electron microscope. A system employing automatic diffraction pattern recognition, crystallographic analysis, and sample or beam scanning was used to acquire the microtexture data.

Microstructural Characterization of Al2O3 Following Simultaneous Triple Ion Bombardment

1988 ◽  
Vol 128 ◽  
Author(s):  
S. J. Zinkle
Keyword(s):  
Cross Section ◽  
Room Temperature ◽  
Microstructural Characterization ◽  
Ion Bombardment ◽  
Dislocation Loops ◽  
Polycrystalline Alumina ◽  
Radiation Induced ◽  
Triple Ion

ABSTRACTThe through-range microstructure of polycrystalline alumina has been examined by cross-section TEM following simultaneous implantation of 2.0 MeV Al+, 1.44 MeV O+, and 0.2 to 0.4 MeV He+ ions at room temperature to a dose of 3.1 keV/atom. The specimen remained crystalline following the irradiation, and four distinct radiation-induced defect features were observed: Network dislocations, dislocation loops, small cavities, and oblong clusters that may be aluminum colloids. The microstructure near the implanted ion region was qualitatively similar to that observed in irradiated regions far from the implanted zone.

Testing and Characterization of Vulcanized Nitrile Swelling Elastomers

2013 ◽  
Author(s):  
Bojan Moslavac ◽  
Davorin Matanovic ◽  
Zlata Hrnjak-Murgic
Keyword(s):  
Mechanical Testing ◽  
Tensile Testing ◽  
Room Temperature ◽  
Nitrile Rubber ◽  
Oil Fields ◽  
Butadiene Rubber ◽  
Testing Sequence ◽  
Link Density ◽  
Cross Link Density

This paper describes preliminary methodology and characterization of the vulcanized nitrile butadiene rubber (NBR) samples submitted to swelling and mechanical testing. Nitrile rubber was used to study swelling processes of swelling packer sealing element. Five different compositions for a rubber vulcanization were used trying to build the best possible combination of components applying different concentrations of each component. Both swelling and mechanical testing were done at the room temperature. Rubber samples swelling was performed in oil acquired from one of Croatian oil fields. The other part of the testing sequence refers to tensile stress-strain tests to the point of break performed on dumbbell samples. Tensile testing was rendered on non-swollen rubber samples using a tensile testing apparatus. From the obtained results it can be seen that swelling process of the nitrile rubber strongly depends on cross-link density.

scholarly journals Low-temperature tension properties of glass-epoxy composite materials

2005 ◽  
pp. 123-134
Author(s):  
Slavisa Putic ◽  
Marina Stamenovic ◽  
Branislav Bajceta ◽  
Predrag Stajcic ◽  
Srdjan Bosnjak
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
Composite Materials ◽  
Room Temperature ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Tension Properties ◽  
Different Temperatures ◽  
Stereo Microscope

The aim of this paper was to present the determination of tensile strength Rm and modulus of elasticity Et of glass-epoxy composites at two different temperatures (at room temperature t=20?C, and at t =?50?C). Standard mechanical testing was carried out on glass woven-epoxy composite material with different structures (two specific weights of reinforcement, 210 g/m2 and 550 g/m2) and orientations (0?/90? and ?45?). Micromechanical analysis of failure was performed on a stereo microscope and SEM in order to determine real models and mechanisms of crack.

Synthesis and Characterization of Hybrid Aluminum Composites Reinforced with Ni Particulates and Interconnected Fe Mesh

2006 ◽  
Vol 111 ◽  
pp. 39-42 ◽  
Author(s):  
W.L.Eugene Wong ◽  
Manoj Gupta ◽  
C.Y.H. Lim
Keyword(s):  
Coefficient Of Thermal Expansion ◽  
Pure Aluminum ◽  
Matrix Material ◽  
Aluminum Matrix ◽  
Hot Extrusion ◽  
Microstructural Characterization ◽  
Mechanical Analysis ◽  
The Matrix ◽  
Melt Deposition

In this study, pure aluminum reinforced with interconnected galvanized iron mesh and Ni particulates was synthesized using an innovative disintegrated melt deposition technique followed by hot extrusion. Microstructural characterization of composite samples showed uniform distribution of Ni and Al-Ni based intermetallic particulates in the matrix material, good interfacial integrity of aluminum matrix with iron mesh and Ni particulates and the presence of minimal porosity. Results of thermal mechanical analysis indicate a decrease in the average coefficient of thermal expansion of the aluminum matrix with the use of hybrid reinforcements. Mechanical characterization also revealed that the coupled use of galvanized iron mesh and Ni particulates lead to an improvement in the hardness, dynamic modulus, 0.2% yield strength and UTS but ductility was adversely affected. An attempt is made to correlate the use of hybrid reinforcements with the improved properties exhibited by the synthesized composites.

Microstructural Characterization of Equiatomic NiTi Alloy Prepared by High Energy Milling

2006 ◽  
Vol 530-531 ◽  
pp. 53-58 ◽  
Author(s):  
Maria do Carmo Silva ◽  
Ana Cris R. Veloso ◽  
Rodinei Medeiros Gomes ◽  
Severino Jackson Guedes de Lima ◽  
Tadeu Antonio de Azevedo Melo ◽  
...  
Keyword(s):  
Room Temperature ◽  
Milling Time ◽  
Niti Alloy ◽  
Microstructural Characterization ◽  
High Energy ◽  
Argon Atmosphere ◽  
Powder Morphology ◽  
X Ray ◽  
Heat Treated

NiTi alloys with equiatomic composition of NiTi have the highest technological interest for its potencial application in differents areas such as biomedical, naval, aerospace, nuclear, automobilist , robotic,etc. In this work , it was used a 50Ni50Ti at % powder mixture, comercially pure, prepared by mechanical alloying in a Attritor with the following conditions: the milling speed and the ball charge were 1500 rpm and 10:1 respectively. The milling time was 2,4,8 and 16h, under an argon atmosphere at room temperature. After milling it was determined the particle size distribution, the phases by X-ray diffractions (XRD) and the powder morphology by scanning electron microscopy (SEM). The milling promotes dissolution of Titanium in Nickel and continuous amorphization by increasing the milling time. After 16h milling the alloy was almost amorphous. The powders after milling were compacted and heat treated at high temperature and microstructural evolution was characterized. In the heat treated samples were detected different phases showing heterogeneity in the alloy. The detected phases were Ni3Ti, NiTi, Ni2Ti and Ni2Ti4O. Contamination by milling was detected in the powder after milling and in the heat treated samples.

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