On the Mechanical Behaviour of Biomimetic Cornstalk-Inspired Lightweight Structures

Area of Science:

• Materials Science
• Biomimetics
• Mechanical Engineering

Background:

• Understanding the mechanical properties of natural structures like cornstalks is crucial for developing advanced materials.
• Biomimetic designs offer potential for creating lightweight yet robust structures with enhanced energy absorption.

Purpose of the Study:

• To investigate the stiffness and energy absorption of three biomimetic structures based on cornstalk internal architecture.
• To compare the performance of these biomimetic structures with existing designs.

Main Methods:

• Manufacturing of specimens using 3D printing with acrylonitrile butadiene styrene (ABS).
• Compression testing at a strain rate of 10⁻³ s⁻¹ to determine structural stiffness, maximum stress, densification strain, and energy absorption.
• Development of a numerical model for analyzing structural behavior under compression.
• Damage assessment using optical microscopy and profilometry.

Main Results:

• The cornstalk-inspired biomimetic structure exhibited superior specific energy absorption (SEA).
• The optimized structure achieved an SEA three times higher than other designs.
• Compression tests provided detailed mechanical performance data.

Conclusions:

• Biomimetic design based on cornstalk internal architecture is highly effective for enhancing energy absorption.
• 3D printing with ABS is a viable method for producing these complex structures.
• The developed biomimetic structures show promise for applications requiring high energy absorption capabilities.