The energy-absorbing characteristics of tubular sandwich structures

Abstract

The energy-absorbing response of sandwich structures with exceptionally high levels of energy absorption is investigated. The sandwich panels are produced by fixing small composite tubes onto metal facings with surface features that reflect the internal geometry of the tubing. Small diameter tubes are employed to manufacture the cores, since it is well established that the specific energy absorption (SEA) characteristics of a composite tube increase as the inner dimension (diameter or wall-to-wall) to thickness ratio decreases. Tests have been undertaken on tubular arrays based on both circular and square composite tubes. The effect of varying the areal density of the tubular array within the core was investigated by systematically increasing the number of tubes from one to nine. An examination of the composites during the crushing process indicated that all of the tubes failed in a splaying process, involving significant fracturing of fibers and longitudinal splitting. The measured values of SEA remained relatively constant in most cases as the areal density of the tubular arrangement was increased, suggesting that cores could readily be designed to absorb known levels of applied external energy. Arrays based on circular tubes offered higher energy-absorbing characteristics than their square counterparts, with values in excess of 100 kJ/kg being recorded in some cases. It is believed that these tubular sandwich structures offer potential for use in components that are subjected to extreme dynamic loading, such as those associated with impact and blast.

Revisión comparativa de la capacidad de absorción de energía mecánica de estructuras tubulares compuestas

“…Los trabajos publicados en la literatura seleccionados para este estudio fueron aquellos que reportaron resultados experimentales sobre la capacidad de absorción de energía de estructuras tubulares cilíndricas de materiales compuestos. Esta selección se fundamentó en la documentación existente que sostiene que la geometría cilíndrica es reconocida por su mayor capacidad de absorción de energía en comparación con otras formas [9,33,36,[42][43][44]. La evaluación de los datos se realizó mediante un proceso sistemático, cuya representación gráfica se presenta en la Figura 1: Figura 1.…”

“…En esta investigación, la absorción de energía (EA, absorción total de energía) se calcula a través de la medición del área bajo la curva experimental carga-desplazamiento típica [16,23,24,36,[43][44][45][46][47][48], obtenida de un ensayo de compresión sobre un espécimen de tubo compuesto. Matemáticamente, la EA se puede calcular usando la ecuación 1:…”

“…Tabla 3 se resumen los datos seleccionados de tres estudios experimentales reportados por Jishi et al [43], Mahdi et al [46] y Cui et al [47] quienes se enfocaron en la evaluación del efecto de las configuraciones y orientaciones de fibra sobre la absorción de energía específica en estructuras tubulares de materiales compuestos. También se presenta un concentrado de las dimensiones de las muestras seleccionadas para el estudio y se etiquetan de acuerdo a la .…”

Study on Impact Mechanical Properties of Reentrant Bionic Automotive Energy Absorbing Box

“…To accurately measure protective performance of bioinspired structures, EA and specific energy absorption (SEA) are used in this paper [ 25 – 27 ].…”

“…Performance Indicators. To accurately measure protective performance of bioinspired structures, EA and specific energy absorption (SEA) are used in this paper [25][26][27]. EA is the total energy absorbed during compression, as shown in Equation (1)…”