The Mechanical Properties of Some Polymer Composites Based on Natural Rubber

2018 ◽  
Vol 55 (1) ◽  
pp. 115-120
Author(s):  
Maria Daniela Stelescu ◽  
Daniel Comeaga ◽  
Maria Sonmez ◽  
Dana Gurau
Keyword(s):  
Natural Rubber ◽  
Polymer Composites ◽  
Mechanical Characteristics ◽  
Filler Content ◽  
Classical Method ◽  
Mechanical Parameters ◽  
Vibration Frequencies ◽  
Internal Damping ◽  
Polyfunctional Monomer

This paper presents the development and characterization of polymer composites based on natural rubber, crosslinked using two types of vulcanization systems, as follows: the classical method using sulfur and curing accelerators and the method using peroxide in the presence of a polyfunctional monomer - trimethylolpropanetrimethacrylate. The composites were made with 0 parts to 100 parts rubber (phr) and 40 phr filler content. The physical-mechanical characteristics of resulting composites depend on the crosslinking method and on the composition. The mechanical parameters of materials were derived by processing the transmissibility curves, derived for samples with known dimensions and density. The main vibration frequencies and the quality factor, derived in the vicinity of resonances, allow to derive the elasticity and internal damping of materials.

Development of X-ray protective garments from rare earth-modified natural rubber composites

2016 ◽  
Vol 49 (6) ◽  
pp. 527-544 ◽  
Author(s):  
Sreedha Sambhudevan ◽  
Balakrishnan Shankar ◽  
A Saritha ◽  
Kuruvilla Joseph ◽  
John Philip ◽  
...  
Keyword(s):  
Rare Earth ◽  
Natural Rubber ◽  
Filler Content ◽  
Rubber Composites ◽  
Suitable Alternative ◽  
X Ray ◽  
Toxic Material ◽  
X Ray Imaging ◽  
Natural Rubber Composites

Commonly used shielding materials while X-ray imaging by clinical persons is based on lead but incessant contact with this toxic material can pave way to severe health problems. Polymer composites, embedded with lead-free additives, especially based on natural rubber can be chosen as a suitable alternative candidate due to its lightweight, cost-effectiveness and capability to absorb regular energy region of X-ray used in medical imaging. Rubber composites were prepared with modified rare earth oxides at different filler loadings. The characterization of the filler reveals that their size falls in the nanoregime, which, in turn, supplemented to the superior properties of the composites. Mechanical properties were found to increase with filler content. X-ray shielding studies were done at different tube voltages and thicknesses and the results prove the efficacy of materials to be considered as a promising shielding resource.

scholarly journals NANOMECHANICAL CHARACTERIZATION OF INDIUM PHOSPHIDE EPILAYER USING NANOINDENTATION TECHNIQUE

2014 ◽  
pp. 44-48
Author(s):  
DIPIKA ROBIDAS ◽  
ARUNSESHAN C ◽  
DEEPTHI K. R ◽  
ARIVUOLI D
Keyword(s):  
Indium Phosphide ◽  
Modulus Of Elasticity ◽  
Significant Variation ◽  
Applied Load ◽  
Mechanical Characteristics ◽  
Mechanical Parameters ◽  
Nanoindentation Technique ◽  
Hardness Values ◽  
Measured Hardness

The Nanomechanical characteristics of InP epilayer grown on GaAs (100) substrate is studied. The mechanical characteristics of the material such as hardness, modulus of elasticity, stiffness, contact depth etc. were studied by Nanoindentation technique with different probe geometries like Berkovich and Vickers. The results show significant variation in the mechanical parameters with respect to the tip geometry and the measured hardness values were observed to increase with the applied load.

scholarly journals Development and Characterization of Microwave Absorber Composite Material

2018 ◽  
Vol 7 (3.32) ◽  
pp. 54 ◽  
Author(s):  
Hashem Al-Mattarneh
Keyword(s):  
Composite Material ◽  
Natural Rubber ◽  
Barium Ferrite ◽  
Filler Content ◽  
Microwave Absorber ◽  
Microwave Properties ◽  
Electromagnetic Properties ◽  
Blending Method ◽  
Thermoplastic Natural Rubber

The rapid development of electronic systems and telecommunications has resulted in a growing and intense interest in microwave electromagnetic absorber technology and microwave absorbing composite material. This research was conducted to develop microwave absorber composites called thermoplastic natural rubber barium ferrite (TPNR-BF). The composite was characterized by determination of its physical, mechanical, magnetic and microwave properties. TPNR-BF with the fine particles barium ferrite filler content of 0-20% by weight were prepared using melt blending method. The microwave electromagnetic properties were measured using free-space microwave non-destructive testing system (MNDTS) in the frequency range of 7-13 GHz. The mechanical and Magnetic properties of the thermoplastic natural rubber-barium ferrite were also measured using Magnetometer. The effects of the different percentage of filler content on the mechanical and microwave properties of the composites have been evaluated. Both microwave dielectric constant and the reflection coefficient of TPNR-BF increase with increasing frequency and filler content while transmission coefficient decreases with increasing filler content which indicates that the composite absorbs more microwave energy by the filler. Barium ferrite contents show an inverse relation with the mechanical properties such as tensile strength and stiffness. MNDTS shows excellent capability for advanced characterization of a microwave composite material.  

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

Infrared Spectroscopy Characterization of Marine Shells

2001 ◽  
Vol 711 ◽  
Author(s):  
Octavio Gomez-Martinez ◽  
Daniel H. Aguilar ◽  
Patricia Quintana ◽  
Juan J. Alvarado-Gil ◽  
Dalila Aldana ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Crassostrea Virginica ◽  
Thermal Treatments ◽  
Vibration Modes ◽  
Lattice Vibrations ◽  
Vibration Frequencies ◽  
Mussel Shells ◽  
Carbonate Lattice

ABSTRACTFourier Transform infrared spectroscopy has been employed to study the shells of two kind of mollusks, American oysters (Crassostrea virginica) and mussels (Ischadium recurvum). It is shown that it is possible to distinguish the different calcium carbonate lattice vibrations in each case, mussel shells present aragonite vibration frequencies, and the oyster shells present those corresponding to calcite. The superposition, shift and broadening of the infrared bands are discussed. Changes in the vibration modes due to successive thermal treatments are also reported.

Thermo-mechanical characterization of nonwoven fabric reinforced polymer composites

2020 ◽  
Author(s):  
Sachin Tejyan ◽  
Divyesh Sharma ◽  
Brijesh Gangil ◽  
Amar Patnaik ◽  
Tej Singh
Keyword(s):  
Polymer Composites ◽  
Mechanical Characterization ◽  
Nonwoven Fabric ◽  
Reinforced Polymer

scholarly journals Experimental Evaluation of Shear Behavior of Stone Masonry Wall

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2313
Author(s):  
Maria Luisa Beconcini ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
Benedetta Puccini
Keyword(s):  
Shear Behavior ◽  
Stone Masonry ◽  
Masonry Walls ◽  
Mechanical Parameters ◽  
In Situ Tests ◽  
Capacity Curves ◽  
Historical Structures ◽  
Definition Of

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

scholarly journals Material parametrization of natural rubber based compound and characterization of crack propagation under consideration of dissipative effects

2021 ◽  
Author(s):  
Dan Pornhagen ◽  
Konrad Schneider ◽  
Markus Stommel
Keyword(s):  
Energy Dissipation ◽  
Crack Propagation ◽  
Natural Rubber ◽  
Experimental Tests ◽  
Material Behavior ◽  
Prony Series ◽  
Material Forces ◽  
Cracking Behavior ◽  
Dissipative Effects

AbstractMost concepts to characterize crack propagation were developed for elastic materials. When applying these methods to elastomers, the question is how the inherent energy dissipation of the material affects the cracking behavior. This contribution presents a numerical analysis of crack growth in natural rubber taking energy dissipation due to the visco-elastic material behavior into account. For this purpose, experimental tests were first carried out under different load conditions to parameterize a Prony series as well as a Bergström–Boyce model with the results. The parameterized Prony series was then used to perform numerical investigations with respect to the cracking behavior. Using the FE-software system ANSYS and the concept of material forces, the influence and proportion of the dissipative components were discussed.

Sign in / Sign up

Export Citation Format

Share Document