A Focus on Dynamic Modulus: Effects of External and Internal Morphological Features
A Focus on Dynamic Modulus: Effects of External and Internal Morphological Features
复制标题
DOI：
10.3390/met11010040
复制
发表时间：
2021-01-01
期刊：
影响因子：
2.9
通讯作者：
Varone, Alessandra
中科院分区：
文献类型：
--
作者：
Richetta, Maria;Varone, Alessandra
目前的工作研究了外部和内部形态特征对动态弹性模量及其测量的影响。它由两部分组成。第一部分考虑了探针几何特征的影响，并展示了粗糙度作为导致杨氏模量低估的系统误差来源的关键作用。第二个重点是孔隙率的影响。我们对几种将孔隙率视为理想规则微观结构的模型以及描述杨氏模量与孔隙率的相对方程进行了回顾和批判性讨论。对于低孔隙率 (p < 0.2) 和孤立孔隙的材料，不同模型预测的相对模量 E-r 值相似，而如果 p > 0.2 且存在互连孔隙，则它们的差异很大。此外，此类模型也无法正确描述具有低孔隙率（p 接近 0.1）的材料的弹性行为，例如在孔隙具有择优取向和不规则形状的情况下的烧结钢。
The present work examines the effects of external and internal morphological features on the dynamic elastic modulus and its measure. It consists of two parts. The first part considers the effect of geometrical features of probes and shows the key role of roughness as source of a systematic error leading to the underestimation of the Young's modulus. The second one is focused on the effect of porosity. Several models which consider the porosity as an ideal regular microstructure and the relative equations describing the Young's modulus vs. porosity have been reviewed and critically discussed. The values of the relative modulus E-r predicted by different models are similar for materials with low porosity (p < 0.2) and isolated pores whereas they strongly diverge if p > 0.2 and interconnected pores are present. Moreover, such models fail to describe the elastic behavior of materials correctly also with low porosity (p approximate to 0.1) such as sintered steels in the case of pores with a preferred orientation and an irregular shape.