# Crashworthiness Analysis of Bio-Inspired Multi-Cell Concave Tubes

## TL;DR

This paper introduces a new bio-inspired structure that improves crashworthiness by mimicking horse tail grass, showing better energy absorption with minimal changes in force.

## Contribution

The novel bio-inspired multi-cell concave tube design significantly improves crush force efficiency compared to existing structures.

## Key findings

- BMCT increases crush force efficiency by 41.04% compared to hierarchical multi-cell tubes with the same number of cells.
- Variations in hierarchical levels improve crush force efficiency by 21.22% at the same mass.

## Abstract

This study presents a novel bio-inspired multi-cell concave tube (BMCT) inspired by the biomimicry of horse tail grass plants. Following the simulation validation, a comprehensive investigation into the crashworthiness of this structure under axial impact was conducted. Concurrently, both experimental and theoretical analyses were employed to substantiate the reliability of the simulation data. Comparative results concerning crashworthiness indicate that, relative to other structures, the BMCT maintains a relatively constant initial peak force while simultaneously enhancing energy absorption capacity at equivalent mass. Specifically, when compared to corresponding hierarchical multi-cell tubes with the same number of cells, the BMCT exhibits a 41.04% increase in crush force efficiency (CFE) while preserving a relatively unchanged initial peak crushing force (IPCF). Additionally, variations in hierarchical levels yield a 21.22% increase in CFE at the same mass.