Material and mechanical behavior of bracket fungi context as a mechanically versatile structural layer

Area of Science:

• Mycology
• Materials Science
• Biomaterials Engineering

Background:

• Fungal sporocarps, or bracket fungi, possess a high strength-to-weight ratio, suggesting potential as sustainable structural materials.
• The vast majority of fungal species remain undescribed, and their mechanical properties are largely uncharacterized.
• Current structural applications often involve environmentally harmful and wasteful practices.

Purpose of the Study:

• To characterize the material behavior and mechanical properties of bracket fungi.
• To investigate the anisotropic nature of their mechanical response.
• To explore their potential as eco-friendly alternatives in structural applications.

Main Methods:

• Micro-mechanical tensile testing was performed on fresh bracket sporocarp samples.
• Microstructural imaging and analysis were used to examine the hyphal network.
• Mechanical properties were assessed in both radial and transverse directions.

Main Results:

• Bracket fungi exhibit anisotropic mechanical behavior, with higher ultimate tensile strength and elastic modulus in the radial direction.
• Strain to failure was found to be greater in the transverse direction.
• Energy absorption (toughness) was isotropic, showing no significant directional difference.

Conclusions:

• The characterized anisotropic mechanical properties and isotropic toughness of bracket fungi support their viability as sustainable materials.
• Findings inspire further research into utilizing bracket fungi in industries like aerospace and agriculture.
• This research highlights the under-explored potential of fungal materials for structural applications.