Borovinsek Matej, Koudelka Petr, Sleichrt Jan, Vopalensky Michal, Kumpova Ivana, Vesenjak Matej, Kytyr Daniel
Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia.
Institute of Theoretical and Applied Mechanics, Czech Academy of Sciences, Prosecka 809/76, 190 00 Prague, Czech Republic.
Materials (Basel). 2021 Oct 8;14(19):5897. doi: 10.3390/ma14195897.
Advanced pore morphology (APM) foam elements are almost spherical foam elements with a solid outer shell and a porous internal structure mainly used in applications with compressive loading. To determine how the deformation of the internal structure and its changes during compression are related to its mechanical response, in-situ time-resolved X-ray computed microtomography experiments were performed, where the APM foam elements were 3D scanned during a loading procedure. Simultaneously applying mechanical loading and radiographical imaging enabled new insights into the deformation behaviour of the APM foam samples when the mechanical response was correlated with the internal deformation of the samples. It was found that the highest stiffness of the APM elements is reached before the appearance of the first shear band. After this point, the stiffness of the APM element reduces up to the point of the first self-contact between the internal pore walls, increasing the sample stiffness towards the densification region.
高级孔隙形态（APM）泡沫元件几乎是球形的泡沫元件，具有坚固的外壳和多孔内部结构，主要用于承受压缩载荷的应用中。为了确定内部结构的变形及其在压缩过程中的变化如何与其力学响应相关，进行了原位时间分辨X射线计算机显微断层扫描实验，在加载过程中对APM泡沫元件进行三维扫描。同时施加机械载荷和射线成像，当力学响应与样品的内部变形相关联时，能够对APM泡沫样品的变形行为有新的认识。研究发现，在第一个剪切带出现之前，APM元件达到最高刚度。在此之后，APM元件的刚度降低，直至内部孔壁首次自接触点，朝着致密化区域增加样品刚度。
