Mechanical and structural optimisation of transverse and radial load bearing characteristics of reed straw based on finite elements

Abstract

This study investigates the mechanical properties of reed straw under axial and radial compression using Micro-CT scanning, Mimics inverse reconstruction, and finite element analysis. Key findings reveal that nodal features play a crucial role in maintaining structural stability by providing radial constraints on the straw's outer bark and pith core. The internal vascular bundles, distributed unevenly with varying sizes, significantly influence the straw's mechanical performance. Under axial compression, the maximum stress recorded was 64.59 MPa, while radial compression yielded a maximum stress of 1.17 MPa. Stress concentrations typically occurred at the nodes, which are identified as the most vulnerable points prone to failure. These insights into the mechanical response of reed straw under compression provide valuable references for biomimetic design and applications in bio-materials.