Browsing by Author "Martínez Calderón, Luis Antonio"

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    Análisis por el método de elementos finitos de los anclajes de cinturones de seguridad en asientos de autobús interprovincial para verificar su resistencia según la norma NTE INEN 2704 en la empresa Miviltech Soluciones Industriales S. A.
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2017) Martínez Calderón, Luis Antonio; Núñez Núñez, Diego Fernando
    This study aims to perform an explicit dynamics finite element analysis of seatbelt anchorages used in interprovincial bus seat structures manufactured by MIVILTECH Industrial Solutions according to evaluation parameters stablished in the Regulation No. 14 of the Economic Commission for Europe referenced in Ecuadorian Technical Standard INEN 2704. First, It was necessary to collect all the necessary information to develop the topic. The most important data is the evaluation, acceptance and rejection parameters, which depend on the type of vehicle where the seats are used. In this case the seats belong to a M3 category vehicle, in which seat belts whith two and three anchorage points are used. After an adequate measurement, a digital model of the whole seat structure was made, which was simplified and optimized to reduce the analysis computing time. The materials used to buil the structure were identified, these materials are ASTM A500 grade A and ASTM A36 structural steels. Their real properties were obtained from traction and flexion tests. With the real properties of the materials the tests were simulated to obtain a material model with a similar behavior to the real materials. The validity of the material models was evaluated through the comparison of the error percentages from the real and simulated tests. Finally, with all the necessary data, material properties and an adequte digital model, resistance analysis of seat belt anchorages for two and three point seat belts were performed. As a result the current structure manufactured by MIVILTECH Industrial Solutions is not able to resist the tests because the stress and strain levels are higher than the allowed by the materials. Consequently, the structure was modified to perform new analyses; the new structure was able to resist the tests satisfactorily.