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5 results on '"Velocidad de deformación"'

1. Estudio de las propiedades a tensión de un material biocompuesto reforzado con haces de fibras cortas de bambú.

Author

Blanco, Eudi, Fajardo, Jorge, Carrasquero, Edwuin, Urbina, Caribay, and Balbino León, José

Abstract

In the present investigation, the tensile mechanical properties of the isotactic polypropylene (PP) biocomposite material reinforced with randomly oriented short bamboo fiber bundles were determined. Samples of the material with different reinforcement contents (20, 30 and 40%) were prepared, using polypropylene with grafts of maleic anhydride molecules (MAPP) as coupling agent. A group of these samples were subjected to an accelerated thermal aging treatment to evaluate the effect of said treatment on the tensile properties of the biocomposite. Tensile tests were carried out at different deformation rates (10 and 50 mm/min) and an increase in tensile strength (29 to 45 MPa) and elastic modulus (1 to 3 GPa) of the PP with the fiber content was obtained. For different stretching speeds, better resistance at high speeds was obtained. Thermal aging for 24 hours at 100 °C increased the resistance of pure PP. For the biocomposites, a low resistance was obtained in the samples aged in greater time (98 °C, 10 days). Through scanning electron microscopy, a microstructural characterization was carried out that allowed explaining the improvement of the resistance of the fiber reinforced PP, and in some cases, the loss of resistance due to heat treatment. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Ensayo dinámico de tracción para la determinación de la curva esfuerzo-deformación a distintas velocidades de deformación

Author

A. Mansilla, A. Regidor, D. García, and A. Negro

Subjects
ensayo de tracción, curva esfuerzo-deformación, velocidad de deformación, simulación por elementos finitos, metodología de ensayo, Mining engineering. Metallurgy, TN1-997
Abstract

Se presenta un estudio detallado del ensayo de tracción a alta velocidad de deformación. Se compararon dos formas diferentes de medir, tanto esfuerzo como deformación. Se interpretaron cuidadosamente las curvas esfuerzo-deformación para distinguir entre el comportamiento real del material y la influencia de la propia metodología de ensayo. Se diseñó una probeta plana especial de dos secciones mediante simulación por elementos finitos. Se obtuvieron, experimentalmente, las propiedades mecánicas como función de la velocidad de deformación y se evaluaron las limitaciones de los sistemas de medida. La ley del material, dependiente de la velocidad de deformación, se simuló, obteniéndose una buena correlación entre las curvas esfuerzo-deformación ingenieril experimental y simulada.

Published
2001
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3. Strain Rate Analysis on the Çankiri-Bingöl Segment of the North Anatolian Fault in Turkey.

Author

Yavasoglu, Hakan

Subjects
*STRAIN rate, *EARTHQUAKE magnitude, *DEFORMATIONS (Mechanics), *DISPERSION (Chemistry), NORTH Anatolian Fault Zone (Turkey)
Abstract

The North Anatolian Fault Zone (NAFZ) is one of the most important fault zones of Turkey and the world. It has produced several high magnitude earthquakes that have resulted in massive loss of lives and resources. National and international research on the North Anatolian Fault zone that Turkey resides on have been realized to better understand and predict the earthquakes produced by it. This study focuses on the Çankırı - Bingöl segment of the NAFZ. The aim of this study is to calculate the strain and latent earthquake potential of the studied area. For this purpose, geodetic data coming from several individual projects have been merged. Strain values have been calculated from the combined data and regions on the fault zone, and strain accumulations have been presented graphically. After calculation, Çankırı, Amasya and Kelkit regions were analyzed. The compressional and extensional deformation has been shown in north and south part of Çankırı basin, respectively. Eastern adjacent area of the Çankırı basin, Amasya region, has the primary branch of the NAF and its subbranches. In the Amasya region, the deformation is mostly on the main branch and the earthquake potential has risen to it. The Kelkit Valley has complex structures and inhomogeneous dispersion. Southeastern and Northwestern part of the Kelkit Valley has varied deformation in micro scale. Consequently, the study results indicate that strain accumulation is concentrated on areas such as the Çankırı basin, Amasya region, and various areas in the Kelkit Valley from west to east. [ABSTRACT FROM AUTHOR]

Published
2015
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4. Estudio del comportamiento termoelastoplástico del PMMA mediante el método de los elementos finitos

Author

Rubio Llorente, Andrés, González López, Sergio, and Universidad Carlos III de Madrid. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras

Subjects
Polímeros, Polimetilmetacrilato, termoelastoplasticidad, Velocidad de deformación, PMMA, Ingeniería Industrial
Abstract

El presente proyecto “Estudio del comportamiento termoelastoplástico del PMMA mediante el método de los elementos finitos” se centra como su propio nombre indica en el estudio del comportamiento termoelastoplástico de polímeros, en especial en el PMMA o polimetilmetacrilato, utilizando para el estudio el método de los elementos finitos mediante un software comercial denominado Abaqus. En el proyecto se presenta una introducción a los materiales poliméricos, así como una descripción más profunda del material a emplear, el PMMA. También se introduce de forma breve el software empleado para la realización de los estudios, así como de la herramienta o subrutina empleada dentro del software para el perfeccionamiento y desarrollo del modelo. Como objetivo adicional a este proyecto, se establece un modelo de plasticidad válido para el PMMA, puesto que los modelos básicos conocidos de plasticidad aplicados a metales no son del todo adecuados. Una vez estudiados varios modelos de la bibliografía, se realiza una serie de simulaciones en la herramienta Abaqus a fin de estudiar su aplicabilidad y la influencia que inciden los distintos parámetros de cada modelo sobre el comportamiento elastoplástico o termoelastoplástico por incidencia de la temperatura del material. ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- This project “Study of thermoelastoplasticity behaviour of PMMA by finite element method” focuses as its name implies in studying the thermoelastoplasticity behavior of polymers, especially in the PMMA or polymethylmethacrylate, using a software tool for the study, based on finite element method named Abaqus. The project presents an introduction to polymer materials and a deeper description of the material that is used, the PMMA. It also briefly introduces the software used to carry out the studies and the tool or software subroutine used within the model to improve it or develop it. An additional objective of this project is to establish a valid model for PMMA plasticity, since known basic models of plasticity applied to metals are not entirely adequate. Once has been studied various models from the literature, it will conduct a series of simulations in our tool to explore their validity and the influence that different parameters regarding each model affects the elastoplasticity behaviour or thermoelastoplasticity behaviour by temperature influence on the PMMA. Ingeniería Técnica en Mecánica

Published
2012

5. Influencia de la granulometría en la resistencia al ahuellamiento de mezclas asfálticas

Author

Reyes-Ortiz, Oscar J and Camacho-Tauta, Javier

Subjects
Deformación plástica, mezcla asfáltica, asphalt mixture, rut speed, granulometría, velocidad de deformación, gradations, rutting
Abstract

El grupo de investigación de Geotecnia de la Universidad Militar Nueva Granada adelantó una investigación para determinar la incidencia en el ahuellamiento de mezclas asfálticas del Instituto Nacional de Vías (INVIAS) y el Instituto Distrital Urbano (IDU), al variar su granulometría en la franja superior, inferior y media. El estudio inició con la caracterización de los materiales (asfalto y granular), seguido de la determinación del porcentaje óptimo de asfalto por el Ensayo Marshall. Por último, se construyeron muestras con las diferentes franjas granulométricas para evaluar la resistencia al ahuellamiento con los contenidos de asfaltos óptimos. Entre los resultados encontrados se determinó que la deformación permanente está directamente relacionada con las franjas granulométricas y la energía de compactación y que, según la normativa, la velocidad de deformación solo la cumple la granulometría MD10. The geotechnic engineering research group of the Universidad M. Nueva Granada, carried out a research about the performance of different bituminous mixes under the wheel tracking test when their gradations changes in the upper, middle and lower layer. Two sets of mixes were studied belonging to the Instituto Nacional de Vias (INVIAS) and the Instituto Distral Urbano (IDU). Previous testing, the granular material and the bitumen were studied in order to determine their properties, and the optimum rate of binder was determined using the Marshall test. Finally, specimens were made following the specifications found in the characterization tests and the wheel tracking test was applied. As a result, the only gradation that satisfies the specifications regarding the deformation velocity is the MD10. Furthermore, it has been found that the rutting is strongly related with the gradations and the compaction energy.

Published
2008

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