Papers by Keyword: Elasticity Modulus

Abstract: The article considers the effect of laser treatment of bearing steel on the change in the elasticity modulus and hardness of the steel SHH15SG. Multi-factor models were obtained that relate the output parameters to the power W of laser radiation, the longitudinal feed Spr of the laser beam and the distance L from the protective glass of the focusing head to the workpiece surface. According to the degree of reduction of the influence on the elastic modulus of steel SHH15SG subjected to laser treatment, these factors are arranged in a sequence: W, Spr, and L. With increasing W and L the modulus of elasticity and hardness of the treated surface layer increase. 3M-XYZ surface-graphs, 3M-XYZ contour-graphs of interactive influence of independent factors on the elastic modulus and hardness of the surface layer are constructed, which simplifies the procedure for assigning the processing mode. The research results are useful for manufacturing and design companies that implement laser technologies and create laser equipment.

Abstract: Composite material represents a complex multi-material structure consisting of coincidence array and reinforcing agent. Basalt continuous fibre and basalt composite material processing technique is one of the present day promising area. With all high characteristics of basalt fibre and basalt made products the ways of it refinement are nowhere near exhausted and one of that ways is nanomodification of the binding agents used in composite production. In this paper quoted the results of the silicate - type nanoparticle retooling influence on mechanical and physical properties of epoxianhydride binding for the purpose of lifting strength and viscoelastic properties of basalt fibre composite. It is found that the appliance of the silicate nanoparticles in epoxianhydride binding between 0.25 to 1 mass. % improve stress-related properties per 10-45%, micro plastics interlaminar shear strength increase by 25-28%, increase of dynamic modulus of elasticity - 30%, mechanical and physical properties of basalt fibre reinforced polymer based on nanomodified binder - 20%. Conducted research efforts show transmission of increased characteristics by nanomodification of epoxianhydride binding onto the characteristics of basalt fibre composite materials.

Abstract: Carbon nanotubes aggregation process in aggregates (bundles) has been studied. This process results in essential reduction of nanocomposites attainable elasticity modulus. The bundles packing density is defined by aggregation expectation time and corresponding carbon nanotube walk dimension up to sticking with a similar nanotube.

Abstract: The aim of this study was to determine the hardness and the elasticity modulus of the two composite resins base of BISGMA with different inorganic particles: a nanoparticulated with a ceramic withload, (Filtek Z350XT-3M) with and without thermal activation and a microhybrid with no ceramic load (Opallis-FGM). The samples were prepared and subjected to the tests of Vickers hardness (Shimadzu HMV) and acoustic excitation pulse (Sonelastic ®). The samples were divided into three groups: G1-Filtek Z350 XT; G2-Filtek Z350XT MO (subject to further polymerization microwave) and G3-Opallis. The results showed that the hardness of G2 was significantly higher than the groups G1 and G3. The elastic modulus was higher than the G2 to G1 and G3. One can conclude that the resins filled with inorganic ceramic filler showed higher hardness and elastic modulus. The thermal activation increased the hardness and the elasticity modulus of the resin with ceramic load.

Abstract: Waste glass is an industrial waste and household garbage, having a "flash color pollution" notoriety. Although some white glass can be processed into glass again, however, low utilization. But much of the waste glass still cannot be recycled. The key to improve the utilization of waste glass is how to effectively use colored and mixed waste glass. Waste glass aggregate concrete as a new material, the study of its basic performance is not mature. Taking into account the impact of different glass replacement rate on their basic mechanical properties, this paper tests carried out static compressive elasticity modulus test with glass concrete. Study the mechanical properties and deformation performance of glass concrete columns the basis of its basic mechanical properties, in order to obtain the glass concrete column of structure performance parameters.

Abstract: The modulus of elasticity is an important property for the behavior analysis of concrete structures. This research evaluated the strain difference between concrete specimens with and without the application of laminate carbon fiber composites as well as the variation time, in months, of the axial strength compression and modulus of elasticity. Through the experimental results, it is concluded that increases in compressive strength and modulus of elasticity are more significant in the specimens without reinforcement.

Abstract: To investigate the changes of corneal tissues morphological structure and biomechanical properties in different month age rabbits, the eyeballs of the 1 month, 2 month and 3 month-old-New Zealand white rabbits were obtained and getting the cornea tissues, and then measured the thickness of the cornea tissues. The first part of the corneal tissue was used to observe cornea structure with HE staining. The second part was used to observe collagen fibrils by electron microscope. The third part of the cornea tissues were cut into strips and used to test the elastic modulus of the cornea on Instron5544 tester. The thickness of the cornea was increased with month age. HE staining observation shows that the numbers of corneal fibroblasts were decreased and the fiber bundle increased with month age. Electron microscope observation shows that the diameters of collagen fibrils were increased at 2 and 3 month. Biomechanical experiment results reveal that cornea tissues elastic modulus was increased with month age. In the post-embryonic stages, the structure of cornea, the structure and number of collagen fiber, the number of corneal fibroblasts and the biomechanical properties of cornea were changed continually.

Abstract: Schizolobium amazonicum is being much used in Brazil for several purposes because, besides being a native Brazilian wood specie, has important features such as low density and small incidence of natural defects. At this point, researches with the purpose of obtaining further knowledge of their properties are being conducted to better targeting their use. The aim of this research is to evaluate the modulus of elasticity of structural size pieces of Schizolobium amazonicum wood using the technique of transverse vibration. Tests were carried out using 30 pieces (standard moisture content 12%) with sizes of 3 cm x 15 cm x 2.5 m. The average value of elastic modulus determined for lumber of Schizolobium amazonicum was interesting to its low specific gravity.

Abstract: Various bone cements with different compositions were prepared in several model configurations which differed in volume (i.e. setting temperature profile) and mode of mixing (manual and vacuum bowl). Local mechanical properties (nanohardness, elasticity modulus) of all experimental states were measured by nanoindentation technique and compared. Role of the preparation route as well as influence of composition, particularly of presence of antibiotics, on the measured properties was investigated.

Abstract: This paper deals with the investigation of the bending properties of rubber mortar with the inclusion of SBRL (butylbenzene latex) and PP (polypropylene) fiber. The results proved the elasticity modulus of modified mortar decreased, especially when modified materials groups were SBRL10 %+R30%+PP, the elasticity modulus of mortar was minimum and the flexibility was the best. The deflection increased with the inclusion of modified materials, especially when 30 vol.% of rubber was included in mortar. The specimens containing 20 vol.% of rubber exhibited post failure loads and the peak load of polypropylene fiber and SBR latex modified rubber mortar with 20 vol.% of rubber grew, whether specimens were included with polypropylene fiber or not.