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以Boltzmann原理为理论依据,对典型生物质进行冷压试验,结合成型过程各阶段的不同特征提出非线性黏弹塑性力学模型及本构模型并加以验证,结果证明该模型科学合理并具有一定通用性。分析本构模型黏弹塑性相关参数与生物质主成分(木质纤维素)各组分含量之间的关系表明,线性黏弹性当量黏度η_2和黏塑性表现黏度η_3随纤维素含量的增大而减弱,随半纤维素和木质素含量的增大而增强,且与半纤维素和木质素的交互作用成正相关关系。分析本构模型可知:冷压生物质的压缩量与压缩力、受压截面积、物料充型长度和加载速度相关,其中压缩力和物料充型长度与压缩量呈正相关,受压截面积和加载速度与压缩量呈负相关。
Boltzmann principle is taken as a theoretical basis to carry out cold compression test on typical biomass. Based on the different characteristics of each stage of the molding process, a nonlinear viscoelastic-plastic mechanical model and a constitutive model are proposed and verified. The results show that the model is scientific and reasonable Sex. Analysis of the relationship between viscoelasticity and constitutive model parameters and the contents of the main components of biomass (lignocellulose) showed that linear viscoelastic equivalent viscosity η_2 and viscoplasticity viscosity η_3 were weakened with the increase of cellulose content , Increased with the increase of hemicellulose and lignin, and had a positive correlation with the interaction of hemicellulose and lignin. Analysis of the constitutive model shows that the amount of compression of cold-pressed biomass is related to the compressive force, compression cross-sectional area, material filling length and loading speed. Compressive force and material filling length are positively correlated with compression amount. Compressive cross-sectional area and Loading speed and compression is negatively correlated.