Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA.
Ecovative Design LLC, Green Island, NY, 12183, USA.
Sci Rep. 2017 Oct 12;7(1):13070. doi: 10.1038/s41598-017-13295-2.
We study a unique biomaterial developed from fungal mycelium, the vegetative part and the root structure of fungi. Mycelium has a filamentous network structure with mechanics largely controlled by filament elasticity and branching, and network density. We report the morphological and mechanical characterization of mycelium through an integrated experimental and computational approach. The monotonic mechanical behavior of the mycelium is non-linear both in tension and compression. The material exhibits considerable strain hardening before rupture under tension, it mimics the open cell foam behavior under compression and exhibits hysteresis and the Mullins effect when subjected to cyclic loading. Based on our morphological characterization and experimental observations, we develop and validate a multiscale fiber network-based model for the mycelium which reproduces the tensile and compressive behavior of the material.
我们研究了一种独特的生物材料，它是由真菌的菌丝体——真菌的营养部分和根结构发展而来的。菌丝体具有丝状的网络结构，其力学性能主要由丝弹性和分支、网络密度控制。我们通过综合的实验和计算方法来报告菌丝体的形态和力学特性。菌丝体的单调机械行为在拉伸和压缩时都是非线性的。该材料在拉伸时破裂前表现出相当大的应变硬化，在压缩时模仿开孔泡沫的行为，并在循环加载时表现出滞后和 Mullins 效应。基于我们的形态学特征和实验观察，我们开发并验证了一个基于多尺度纤维网络的菌丝体模型，该模型再现了材料的拉伸和压缩行为。
