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The effect of mechanical alloying on Al2O3 distribution and properties of Al2O3 particle reinforced Al-MMCs
The properties of particle-reinforced aluminum composites depend on the microstructure and evolved uniformity distribution of particles in the matrix. The distribution of Al2O3 particles in the matrix and microstructure properties of varying volume fraction of particles up to 15% Al2O3 particle-reinforced Al metal mat…
Effect of warm compaction and microwave sintering on the densification, tribological and electrochemical properties of TiC/316L composites
In this study, TiC/316L stainless steel composites were fabricated by combining warm compaction and microwave sintering (WMS). X-ray diffraction analysis was used to identify the phases in the material. Microstructure characteristics of composites were performed by means of scanning electron microscopy (SEM). Density,…
The new european standard on common cements specifications EN 197-1:2011
In this paper, the novelties of European standard EN 197-1:2011 which has been aprobed on 6th August, 2011 are presented. The european standard EN 197-1:2011 has been published in the Official Journal of the European Union on 19th June, 2012 (C 176/1). The UNEEN 197-1:2011 will be published in Spain in the Official Jo…
Behavior of steel fiber high strength concrete under impact of projectiles
This paper presents the results of the investigation carried out by the authors about the behavior of 80 MPa characteristic compression strength concrete reinforced with different amount of high carbon content steel fiber, submit to impact of different caliber projectiles, determining the thickness of this type of con…
Interaction between cements with different composition and superplasticizers
The slump behavior of ordinary Portland-, pozzolanic (red brick powder)-, sulfate resistant-, and limestone cement pastes caused by ≤ 1% additions of polycondensates and polycarboxylates superplasticizers are monitored for up to 90 minutes. With the plolycondensates, Portland- and pozzolanic cements gain fluidity at h…
Lorentz Center Workshop: Dynamics of Complex Fluid-Fluid Interfaces
Experimental study of the impact behavior of laminated composites stricken by sharp impactors
In this study, the influence of the impactor shape on the dynamic response of E-glass/epoxy laminates was investigated. Composite samples were impacted using steel 90° and 120° conical, 24 mm and 12 mm in diameter hemispherical, pyramidal impactors via a specially developed drop weight test machine. The impact tests w…
Markov chain modeling of evolution of strains in reinforced concrete flexural beams
From the analysis of experimentally observed variations in surface strains with loading in reinforced concrete beams, it is noted that there is a need to consider the evolution of strains (with loading) as a stochastic process. Use of Markov Chains for modeling stochastic evolution of strains with loading in reinforce…
Comparative Study on Acoustic Behavior Between Light Multi-layered and Traditional Façades
Light multi-layered facade systems in general have been acoustically little studied. The data available suggests they do not usually fulfil the sound insulation values required in the Technical Building Code (CTE) in particularly in noisy environments. Therefore the main objectives of this study, is to obtain light mu…
Society's Site Sep 2012 - Feb 2013
DEVELOPMENT AND APPLICATION OF COMPUTACIONAL SIMULATION OF PLATE ROLLING AT USIMINAS
This work shows the development of a tool for computer simulation of steel plate rolling, which allows the calculation of the thermal evolution of the slab, some process parameters such as force, plate thickness, electrical current and torque in the motors. Mathematical models have been implemented and structured in a…
USE OF NANOTECHNOLOGY PRE-TREATMENT IN AUTOMOTIVE PAINTING LINE
The current safety requirements, environmental impacts and performance have been ledding the automotive industry to search for new alternatives, not just for new car bodies materials, also for new sheet surface treatments as well, used in the painting process in order to fit simultaneous, environmental requirements an…
COMPARISON BETWEEN MODELS FOR CALCULATION OF INDUSTRIAL HOT ROLLING LOADS
An evaluation is made about the precision of hot strip rolling mill loads at the F1 stand calculated according to the theoretical models of Orowan, Sims, Alexander-Ford, Orowan-Pascoe, Ekelund and Tselikov in comparison to real values got for carbon-manganese steels. In the deterministic approach, without any fit of t…
NUMERICAL AND EXPERIMENTAL ANALYSIS OF RESIDUAL STRESSES GENERATED DURING HARDENING OFAISI 4140 BAR
The aim of this work is to analyze the distribution of residual stresses resulting from the combination of volumetric changes due to heat gradients and phase changes occurring during the quenching process of an AISI/SAE 4140 steel cylinder. The mathematical model used for this objective is the AC3 modeling software of…
TANDEM COLD MILL PROCESS STABILITY IMPROVEMENT WITH CHROME PLATED WORK ROLLS APPLICATION
The stability of a tandem cold mill is essential to assure the thickness control, the main attribute of cold rolled steel sheets. This stability can be defined as the capability to control the process variables that act direct at the thickness. Among the most important variables are the first stand (mill) linear speed…
THERMODYNAMIC AND KINETIC PARAMETERS OF MIXTURES DESULFURIZING THE MADE WITH CaO, MgO, SiO2 AND CaF2
This paper presents an analysis of the kinetics and thermodynamics of marble residue mixtures utilisation on desulfurization of pig iron. The desulfurization was carried out using lime, marble residue, fluorite and pig iron. Different mixtures of these materials were added into a bath of pig iron at 1,450°C. Metal sam…
Study on in situ Al-Si functionally graded materials produced by traveling magnetic field
The aim of this contribution was to investigate the microstructure of in situ Al-Si functionally graded materials produced by traveling magnetic field. The research shows that the composition and associated microstructural feature of Al-Si alloys processed by this method changes from the outer of samples to the inner,…
A study on some properties of thin biocomposites made from unbeaten wood and non-wood pulps
A number of thin biomaterials were prepared via a wet formation method from seven different unbeaten plant fibers without using any chemical additives. It is noted that sheets made with short fibers (Flax-B: 0.32 mm and Straw-UB: 0.36 mm) and high fine content (Flax-B: 9.77% and Straw-UB: 10.64%) showed higher tensile…
Thermal buckling load optimization of laminated folded composite plates
In this study, thermal buckling load optimization of symmetrically laminated composite folded plates subjected to uniformly distributed temperature load is investigated. The objective function is to maximize the critical temperature capacity of laminates and the fiber orientation is considered as a design variable. Th…