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Behavior of oil-based modeling clay at medium strain rates

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Hernandez, Camilo
Buchely, Mario
Maranon, Alejandro
Casas-Rodriguez, Juan P.
Abstract (Spanish)
La arcilla de modelar es un material blando, fluido y maleable a base de aceite elaborado a partir de ceras y aceites. Además de su uso principal para hacer esculturas, la arcilla de modelar se utiliza comúnmente para evaluar chalecos antibalas y simular procesos de fabricación de metales por conformación. En pruebas balísticas, la arcilla se utiliza para retener la deformación de la cara posterior de los chalecos antibalas; y en el estudio de los procesos de conformado de metales, se utiliza como modelo físico para proporcionar información sobre el flujo plástico. Sin embargo, su comportamiento dinámico mecánico no se entiende por completo. En este estudio, la arcilla de modelar Plastilina Roma No. 1 se caracterizó mecánicamente utilizando el modelo constitutivo de ley de potencia a velocidades de deformación medias ( 102 s-1). Los parámetros del material se determinaron utilizando un modelo de penetración basado en la teoría de expansión de cavidades y una técnica inversa que implica la comparación del modelo con la experimentación. El conjunto óptimo de parámetros constitutivos se encontró reduciendo la diferencia del perfil de penetración calculado y las mediciones de una prueba de caída. Este proceso de optimización se programó en el entorno MATLAB-Simulink. Los parámetros del material determinados se validaron comparando los resultados de un modelo computacional con tres configuraciones de prueba. Los resultados del modelo de elementos finitos muestran una buena concordancia con las mediciones experimentales.
Abstract (English)
The modeling clay is an oil-based soft, flowable, and pliable material made from waxes and oils. Besides its primary use for making sculptures, the modeling clay is commonly used to evaluate bulletproof vests and simulate metal manufacturing processes by conformation. In ballistic tests, the clay is used to retain the deformation of the rear face of body armors; and in the study of metal forming processes, it is used as a physical model to provide information on the plastic flow. However, its mechanical dynamic behavior is not entirely understood. In this study, Plastilina Roma No. 1 modeling clay was mechanically characterized using the power-law constitutive model at medium strain rates . The material parameters were determined using a penetration model based on the Cavity Expansion Theory and an inverse technique involving the comparison of the model with experimentation. The optimum set of constitutive parameters was found by reducing the difference of the calculated penetration profile and the measurements from a drop test. This optimization process was programmed on the MATLAB–Simulink environment. The determined material parameters were validated by comparing the results from a computational model with three test set-ups. Finite element model results show good concordance with experimental measurements.
Extent
11 páginas
URI: https://repositorio.escuelaing.edu.co/handle/001/3152
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AK - Diseño Sostenible en Ingeniería Mecánica – DSIM
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