论文标题
通过AFM实验估算自由干燥纸中木浆纤维的原位弹性常数
Estimation of the in-situ elastic constants of wood pulp fibers in freely dried paper via AFM experiments
论文作者
论文摘要
基于原子力显微镜基于原子力显微镜（AFM-NI），可以表征木浆纤维在代表纸张纸内状态的条件下的基本机械性能。在不同载荷下的机械性能确定对于越来越高级的计算模型的成功至关重要，以理解，预测和改善纸张和纸板的行为。在这里，AFM-NI用于将纤维横向沿纤维的纵向轴横切。相对湿度从25％至75％获得了压痕模量和硬度。在测试范围内，硬度和压痕模量表现出水分依赖性，分别降低了75％和50％。确定的压痕模量与先前的工作相结合，以估计纤维壁的纵向和横向弹性模量。由于压痕模量相对较低，与通过单光纤测试获得的值相比，弹性常数也很低。
Atomic force microscopy-based nanoindentation (AFM-NI) enables characterization of the basic mechanical properties of wood pulp fibers in conditions representative of the state inside a paper sheet. Determination of the mechanical properties under different loads is critical for the success of increasingly advanced computational models to understand, predict and improve the behavior of paper and paperboard. Here, AFM-NI was used to indent fibers transverse to and along the longitudinal axis of the fiber. Indentation moduli and hardness were obtained for relative humidity from 25 % to 75 %. The hardness and the indentation modulus exhibit moisture dependency, decreasing by 75 % and 50 %, respectively, over the range tested. The determined indentation moduli were combined with previous work to estimate the longitudinal and transverse elastic modulus of the fiber wall. Due to the relatively low indentation moduli, the elastic constants are also low compared to values obtained via single fiber testing.
