Borovinšek Matej, Vesenjak Matej, Higa Yoshikazu, Shimojima Ken, Ren Zoran
Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia.
Department of Mechanical Systems Engineering, National Institute of Technology (KOSEN), Okinawa College, 905 Henoko, Nago, Okinawa 905-2192, Japan.
Materials (Basel). 2019 Apr 2;12(7):1088. doi: 10.3390/ma12071088.
The mechanical properties of Advanced Pore Morphology (APM) foam elements depend strongly upon their internal porous and external structural geometry. This paper reports on a detailed investigation of external (e.g. shape and size) and internal (e.g. distribution, size, number of pores) geometry and porosity changes of APM foam elements, during compressive loading by means of the ex-situ micro-Computed Tomography, and advanced digital image analysis and recognition. The results show that the porosity of APM foam elements decreases by only 25% at the engineering strain of 70% due to an increase of the number of pores at high stages of compressive deformation. The APM foam elements also exhibit a positive macroscopic Poisson's ratio of υ = 0.2, which is uncharacteristic for cellular structures.
先进孔隙形态（APM）泡沫元件的力学性能在很大程度上取决于其内部孔隙结构和外部结构几何形状。本文通过非原位微观计算机断层扫描、先进的数字图像分析与识别技术，详细研究了APM泡沫元件在压缩载荷作用下的外部（如形状和尺寸）和内部（如孔隙分布、尺寸、数量）几何形状以及孔隙率变化。结果表明，由于在高压缩变形阶段孔隙数量增加，APM泡沫元件在70%工程应变下孔隙率仅降低25%。APM泡沫元件还表现出正的宏观泊松比υ = 0.2，这对于多孔结构来说是不常见的。
