Mechanical behaviors of inclined cell honeycomb structure subjected to compression

Nowadays, there has been an increasing interest in the study of cellular structures under non-ideal loading situation. In this study, comprehensive investigations of honeycomb structure embedded with the inclined cells were carried out to understand the mechanical behavior subjected to compression. Factorial analyses in several of inclined angles ranging from 0 to 90° were conducted both experimentally and numerically, from which excellent correlation has been observed. Three patterns of deformation modes of various inclined cell honeycomb structures with different tilt angle were categorized, some key spinodals of off-axis angle have been determined. In addition, theoretical relationship between inclined angle and strength of honeycomb has been successfully constructed, and validated with experiments as well as numerical simulation. Excellent agreement has been observed between them. According to this study, the mean plateau stress is not only related with the out-of-plane crush strength, but also related to in-plane crush strength. In general, it shows a cosine-like function with the tilt angle before 45°. These provide significant guidelines to characterize the mechanical properties of the honeycomb under non-ideal loading situation, so as to combine them in kinds of equivalent constitutive model in finite element simulation.