The Mechanical Response of a Structural Epoxy Adhesive Reinforced with Carbon Black Nanoparticles

2018 ◽  
Vol 25 (1) ◽  
pp. 187-191 ◽  
Author(s):  
Ricardo J. C. Carbas ◽  
Lucas F. M. da Silva ◽  
Luís F. S. Andrés
Keyword(s):  
Carbon Black ◽  
Mechanical Behavior ◽  
Mechanical Response ◽  
Tensile Tests ◽  
Epoxy Adhesive ◽  
Carbon Black Nanoparticles ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Strength And Deformation ◽  
Structural Adhesive

AbstractThe influence of the concentration of carbon black nanoparticles on the mechanical behavior of a structural adhesive was studied to evaluate and understand the stiffness, strength, and deformation behavior of a reinforced epoxy adhesive. Two carbon black nanoparticles with different dielectric properties and sizes (Monarch® 120 and Vulcan® XC72R) were studied. A bi-component structural epoxy adhesive was selected. Specimens with different concentrations of carbon black were manufactured (0, 5, 10, and 20% on volume of resin) for each type of nanoparticle. The specimens were cured in a hydraulic hot-plates press machine. The mechanical behavior of the adhesives was found not to vary significantly as a function of carbon black nanoparticles amount. A scanning electron microscopy analysis was performed to evaluate the fracture surface. The fracture surfaces of specimens were correlated with the mechanical response obtained through tensile tests.

Effect of carbon black nanoparticles concentration on the mechanical properties of a structural epoxy adhesive

2016 ◽  
Vol 232 (5) ◽  
pp. 403-415 ◽  
Author(s):  
RJC Carbas ◽  
LFM da Silva ◽  
LFS Andrés
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Epoxy Adhesive ◽  
Thermal Heating ◽  
Fracture Surfaces ◽  
Spherical Carbon ◽  
Carbon Black Nanoparticles ◽  
Electron Microscopy Analysis ◽  
Nanoparticles Concentration ◽  
Strength And Stiffness

The present work describes the influence of different carbon black nanoparticles with different concentrations on the mechanical properties of a structural epoxy adhesive cured by dielectric and thermal heating. This work was undertaken to improve the understanding of the effect of carbon black nanoparticles concentration on the stiffness (Young’s modulus), strength (yield strength) and deformation of the adhesive. Two kinds of spherical carbon black nanoparticles with different dielectric properties and sizes were used. Specimens with different amounts of carbon black were manufactured for each nanoparticle. The mechanical properties of the adhesive were measured in bulk specimens. The mechanical properties were found to vary as a function of the carbon black amount. For the dielectric cure, the strength and stiffness of the adhesive decrease as the amount of carbon black nanoparticles increases. On the other hand, the adhesive showed an increase of the deformation with an increase of the carbon black concentration. The thermal cure showed a mechanical behaviour similar as the dielectric cure, but the curing time increases substantially. A scanning electron microscopy analysis was performed to analyse the surface fracture of the adhesive. The fracture surfaces of specimens cured by dielectric and thermal heating and without nanoparticles are similar, typical of brittle adhesive. For high carbon black amount, the fracture surfaces are typical of ductile adhesive.

Experimental Investigation on the Mechanical Behavior of Polyurethane PICCs after Long-Term Conservation in in Vivo-Like Conditions

2017 ◽  
Vol 18 (6) ◽  
pp. 522-529 ◽  
Author(s):  
Francesca Di Puccio ◽  
Giuseppe Gallone ◽  
Andrea Baù ◽  
Emanuele M. Calabrò ◽  
Simona Mainardi ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Mechanical Response ◽  
Tensile Tests ◽  
Ethanol Solution ◽  
Uniaxial Tensile ◽  
Research Activity ◽  
Two Fluids ◽  
Weight Variation

Introduction In a previous paper, the authors investigated the mechanical behavior of several commercial polyurethane peripherally inserted central venous catheters (PICCs) in their ‘brand new’ condition. The present study represents a second step of the research activity and aims to investigate possible modifications of the PICC mechanical response, induced by long-term conservation in in vivo-like conditions, particularly when used to introduce oncologic drugs. Methods Eight 5 Fr single-lumen catheters from as many different vendors, were examined. Several specimens were cut from each of them and kept in a bath at 37°C for 1, 2, 3 and 6 months. Two fluids were used to simulate in vivo-like conditions, i.e. ethanol and Ringer-lactate solutions, the first being chosen in order to reproduce a typical chemical environment of oncologic drugs. The test plan included swelling analyses, uniaxial tensile tests and dynamic mechanical thermal analysis (DMTA). Results and conclusions All tested samples were chemically and mechanically stable in the studied conditions, as no significant weight variation was observed even after six months of immersion in ethanol solution. Uniaxial tensile tests confirmed such a response. For each PICC, very similar curves were obtained from samples tested after different immersion durations in the two fluid solutions, particularly for strains lower than 10%.

Printing Inks of The Annals of the Joseon Dynasty

2018 ◽  
Vol 39 (1) ◽  
pp. 19-32
Author(s):  
Kang-Jae Kim ◽  
Tae-Jin Eom
Keyword(s):  
Carbon Black ◽  
Principal Component ◽  
Binding Medium ◽  
The World ◽  
Printing Inks ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Joseon Dynasty ◽  
The Republic ◽  
Scanning Electron

AbstractA field emission scanning electron microscopy analysis was carried out to determine the origin of the oriental printing inks used inThe Annals of the Joseon Dynasty, which are a national treasure of the Republic of Korea and listed in UNESCO’s Memory of the World Register. The average diameters of the carbon black found in the printing inks of all the samples were in the range of 30–500 nm. The carbon black diameters of the printing inks in J-Se 68, J-Se 124, and T-Gwang 37 were 80–130 nm, whereas those of the printing inks in J-Seong 1, T-In 46, and T-Heon 4 were larger than 150 nm. It could be concluded that the printing inks in J-Se 68, J-Se 124, and T-Gwang 37 are lampblack ink, and those in J-Seong 1, T-In 46, and T-Heon 4 are charcoal ink. Furthermore, the results of infrared (IR) and principal component analysis (PCA) of printing inks suggest that there was no difference in the binding medium used in the manufacturing process of the charcoal ink stick and the lampblack ink stick.

Dynamic Tensile Tests of Auto-Body Steel Sheets with the Variation of Temperature

2006 ◽  
Vol 116-117 ◽  
pp. 259-262 ◽  
Author(s):  
Hee Jong Lee ◽  
Jung Han Song ◽  
Hoon Huh
Keyword(s):  
Flow Stress ◽  
Tensile Test ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
High Speed ◽  
Mechanical Response ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Static State ◽  
Steel Sheets

This paper is concerned with the thermo-mechanical behavior of steel sheet for an autobody including the temperature dependent strain-rate sensitivity. Tensile tests have been carried out with the high strength steel sheets such as SPRC35R, SPRC45E and TRIP60. The tensile tests were performed with the variation of the strain-rates from 0.001/s to 200/s and with the variation of environmental temperatures from -40 to 200. The thermo-mechanical response at the quasi-static state is obtained with the static tensile test and the one at the intermediate strain-rate is obtained with the high speed tensile test. Both the strain-rate and the temperature sensitivity of the flow stress are calculated for the quantitative evaluation of thermo-mechanical behavior of steel sheets. The results demonstrate that as the strain-rate increases, the variation of the flow stress becomes more dependent on the temperature. The results also indicate that the material properties of SPRC35R are more sensitive to the strain-rate and the temperature than those of SPRC45E and TRIP60.

A Visco-Hyperelastic Constitutive Model for Multilayer Polymer Membranes and its Application in Packaging Air Cushion

2016 ◽  
Vol 08 (05) ◽  
pp. 1650062
Author(s):  
Yingfeng Liu ◽  
Qiong Rao ◽  
Ming Chen ◽  
Xiongqi Peng ◽  
Shaoqing Shi
Keyword(s):  
Experimental Data ◽  
Constitutive Model ◽  
Mechanical Behavior ◽  
Mechanical Response ◽  
Tensile Tests ◽  
Packaging Material ◽  
Polymer Membrane ◽  
Rate Dependent ◽  
Highly Nonlinear ◽  
Air Cushion

Air cushion is an important packaging material with admirable cushion property in protecting articles from damage. Polymer membrane in air cushion renders a highly nonlinear elastic and rate dependent mechanical behavior in experimental tensile test. A visco-hyperelastic constitutive model for a polymer membrane of an air cushion is developed by additively decomposing its mechanical response into a hyperelastic portion and a viscoelastic portion. Material parameters are consecutively obtained by matching experimental data of static and dynamic uni-axial tensile tests of the membrane, respectively. Compression test of a single air column of the air cushion is conducted as a means of validation on the proposed constitutive model. By comparing simulation results with experimental data, it is shown that the proposed visco-hyperelastic model can properly characterize the mechanical behavior of the air cushion packaging material. The model can be applied to evaluate cushion performance of air cushions and their optimum design.

Material analysis techniques using the ion mill

1996 ◽  
Vol 54 ◽  
pp. 1034-1035
Author(s):  
J. P. Benedict ◽  
R. M. Anderson ◽  
S. J. Klepeis
Keyword(s):  
Polished Surface ◽  
Surface Material ◽  
Analysis Techniques ◽  
Material Analysis ◽  
Optical Inspection ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Argon Ions ◽  
The Impact ◽  
Scanning Electron

Ion mills equipped with flood guns can perform two important functions in material analysis; they can either remove material or deposit material. The ion mill holder shown in Fig. 1 is used to remove material from the polished surface of a sample for further optical inspection or SEM ( Scanning Electron Microscopy ) analysis. The sample is attached to a pohshing stud type SEM mount and placed in the ion mill holder with the polished surface of the sample pointing straight up, as shown in Fig 2. As the holder is rotating in the ion mill, Argon ions from the flood gun are directed down at the top of the sample. The impact of Argon ions against the surface of the sample causes some of the surface material to leave the sample at a material dependent, nonuniform rate. As a result, the polished surface will begin to develop topography during milling as fast sputtering materials leave behind depressions in the polished surface.

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