New empirical relationship is proposed to calculate instantaneous maximum diameters on the sample during compression test. The proposal a between diameter, friction coefficient, initial dimensions of and displacement Seventeen tests were carried out copper cylindrical samples without lubrication at room temperature obtain this new relationship. Numerical simulations taking into count for numerical validation. calculated with are same experimental measurements. mechanical behavior corrections...

The Norton-Bailey equation was used to simulate by finite elements the hardening and dynamic recovery of copper during hot compression tests. constants were determined from Voce-Kocks model. simulation assumes a Mortar Contact with Coulomb friction axial symmetry. Numerical results compared experiments. Six tests carried out at 804 K, three strain rate 0.1 s-1 1 s-1. show: differences between experiments simulations are less than 7.69% for rates s-1, 0.67% This shows that is possible...

En el presente trabajo se estudia efecto de la velocidad deformación en recristalización dinámica un cobre electrolítico puro durante su caliente con temperatura descendente. Para ello, realizaron ensayos compresión hasta deformaciones verdaderas cercanas a uno, cuatro velocidades deformación, mientras descendía temperatura. Los realizados las dos más bajas mostraron picos múltiples ascenso tensión lugar del estado saturación, debido probablemente al continuo descenso Con aumento velocidad,...

La simulación del ensayo de compresión cobre se realizó con el método contacto mortero y asume: simetría axial, restricción puntos múltiples tipo plano, carga concentrada fricción coulombiana. El simula como material isotrópico, elástico hasta fluencia, luego un endurecible plasticidad incremental. comportamiento calculó a partir experimentos. Se realizaron diecisiete ensayos sin lubricación muestras cilíndricas temperatura ambiente. relación Esfuerzo vs. Deformación usando dos correcciones...

It is possible that the magnetic field affect growth morphology of materials at nanometric scale while there are synthesized. In this work developed a thermal plasma reactor in fluidized bed assisted by mirror for material synthesis using liquid spray. An aluminum solution carrier with without external applied. We found from characterization synthesized that: Aluminum nanowire and alumina nanofiber generated when applied to reactor.

Hot compression tests are performed when jaws, each one with a jacketed section to cool part of its length, move through tube furnace at elevated temperatures compress metal sample between them, changing the boundary conditions and temperature distribution inside during test. This paper presents preliminary study about variation for hot tests, jaws positioned it. It also proposes theoretical simulation determine profile in furnace, which is compared experimental measurements. Both...

A new biocomposite material based on polylactic acid (PLA) with meshes of Yanchama fibers is introduced. This bio-based composite was fabricated by compression molding and film-staking process. tested tensile tests in different directions numerically simulated. The simulated as an elastic orthotropic material. nine constants behavior are calculated from modules Young measured experimentally. experiment results simulations the same. show that mechanical PLA-Yanchama under load solicitudes can...

The purpose of this work is to describe by means numerical simulation the behavior thermal plasma flow in a new design reactor assisted magnetic field fluidized bed for new-materials synthesis. based on energy transfer between electrons' and plasma's gas. This model took into account ionization changes, net production rate electrons, Lorentz force, drag gravity force collision frequency. has been solved magnetohydrodynamics (MHD) equations, infinitesimal volume control supposed axial...

Effect of magnetic fields on growth morphology aluminum crystals was studied in a fluidized bed thermal plasma reactor assisted by mirrors. Aluminum were precipitated the using powder or aluminum-graphite mixture as precursors. The absent field also for comparison. Products characterized scanning electron microscopy (SEM) and X-ray Diffraction (XRD). Results indicated that, regardless precursor used, it observed presence nanowires when external mirror applied, suggesting that are able to...

Fiber-reinforced concrete has been used for over a century to improve the mechanical properties of building concrete. The Flexural Test is one most common tests measure This work an experimental and numerical study where different depths metal chips (1.0; 1.5; 2.0 2.5 mm) are as fiber-reinforced chip replaces sand in percentages (0%, 15%, 25% 50%). weight measures showed that modulus rupture density increase with size its percentage from 2.20 2.55 g/cm3 4.6 8.6 MPa, respectively. Numerical...