College of Engineering, China Agricultural University (East Campus), PB 191, 17 Qing-Hua-Dong-Lu, Hai-Dian District, Beijing 100083, PR China.
Carbohydr Polym. 2015 Nov 20;133:135-43. doi: 10.1016/j.carbpol.2015.07.002. Epub 2015 Jul 13.
Biomechanical behavior is a fundamental property for the efficient utilization of wheat straw in such applications as fuel and renewable materials. Tensile experiments and lignocellulose analyses were performed on three types of wheat straw. A multi-scale finite element model composed of the microscopic model of the microfibril equivalent volume element and the macroscopic model of straw tissue was proposed based on the physiological structure and lignocellulose components of wheat straw. The tensile properties of wheat straw were simulated by ANSYS software. The predicted stress-strain data were compared with the observed data, and good correspondence was achieved for all three types of wheat straw. The validated multi-scale finite-element (FE) model was then used to investigate the effect of the lignocellulose components on the biomechanical properties of wheat straw. More than 80% of stress is carried by the cellulose fiber, whereas the strain is mainly carried by the amorphous cellulose.
生物力学行为是有效利用小麦秸秆作为燃料和可再生材料的基础特性。对三种类型的小麦秸秆进行了拉伸实验和木质纤维素分析。基于小麦秸秆的生理结构和木质纤维素成分，提出了一种由微纤维等效体积元的微观模型和秸秆组织的宏观模型组成的多尺度有限元模型。使用 ANSYS 软件模拟了小麦秸秆的拉伸性能。将预测的应力-应变数据与观察数据进行了比较，对于所有三种类型的小麦秸秆都取得了很好的一致性。然后，使用经过验证的多尺度有限元（FE）模型研究了木质纤维素成分对小麦秸秆生物力学性能的影响。超过 80%的应力由纤维素纤维承担，而应变主要由无定形纤维素承担。
