Abstract
The orthotropic crush model has commonly been used to describe the stress-strain behavior of honeycomb. Important model parameters include crush strength and crush efficiency of each principal direction. Experiments were conducted to obtain these model parameters of high-density honeycombs. Various deformation modes were observed during “bare” compression tests. The normal crush mode of honeycomb is progressive plastic buckling. Low energy absorption (or abnormal) modes include transverse splitting and global buckling. To obtain a consistent normal mode of deformation under wide testing conditions, a confined compression test was developed. A series of confined compressions on T-, L-, and W-directions were performed to get crush parameters for the orthotropic crush model. The temperature dependence and loading rate effects on crush parameters were also obtained.
