Experimental investigation of energy absorption characteristics of a novel modular structure
摘要
Modularization in structural members, especially in energy absorption applications, provides tailorable mechanical properties through design variables and different modularization configurations. Moreover, when modular structures are deformed or when loading conditions change, they reduce waste material usage by only replacing damaged modules and providing a continuously modifiable framework via adding and removing modules. The present study aims to develop a modular structure inspired by traditional re-entrant auxetic pattern. The modular structure contains reentrant auxetic cell in the center, surrounding oblique non-contacting plates to enhance energy absorption characteristics and locking mechanism at the end for modularization. First, Taguchi orthogonal array was applied for the design of experiments and samples were manufactured and tested. It was found that design-7 (HLH) has 97% larger specific energy absorption than average of all specimens and design-9 (HHM) has 80% higher crushing forces than average. Specimens determined based on Taguchi array have a crushing force efficiency within the interval of 0.7 and 0.82. Then, level averages of mechanical properties for each design variable were obtained. It was found that increasing the thickness of the central oblique plate and inclination angle increases specific energy absorption. Later, multimodule configuration was also tested under the same conditions and it was revealed that a strong correlation exists between single and multimodule configurations in terms of crushing forces and overall force-displacement trend.