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Advances in novel metamaterials

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报告题目:Advances in novel metamaterials

报告人: Prof. Zoran Ren, Prof. Matej Vesenjak and Mr. Nejc Novak

     University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia

时间:2018年6月14日下午14:00

地点:北京理工大学3号教学楼146会议室

报告摘要:

The presentation will give a short overview of cellular materials in general. Their properties, fabrication procedures and application possibilities will be briefly discussed. Then their geometrical characterization, experimental testing and computational modelling within the finite element method of various cellular metal types will be described. The geometrical characterisation is based on the analysis of micro computed tomography scans and proper recognition of their internal cellular structure, taking into account the statistical distribution of morphological and topological properties. The results of conducted geometrical analysis provided means to develop methodology for proper 2D and 3D  geometrical modelling of irregular cellular materials and consequent formation of computational models. The numerical models of quasi-static, dynamic and cyclic loading conditions were validated by mechanical experimental tests supported by infrared thermography.

The advances in auxetic cellular structures will be discussed in the next part of presentation. Negative Poisson’s ratio is a consequence of internal structure deformation. This effect is useful for many different applications to enhance properties in density, stiffness, fracture toughness, energy absorption and damping. Several 2D and 3D auxetic structures will be introduced. Experimental results of some selected auxetic structures, tested under quasi-static and dynamic loading conditions, will be presented. Furthermore, representative discrete computational models built with the beam finite elements and homogenised computational models that were validated by experimental data will be shown as well. They were developed to explore the auxetic response at different loading conditions and material distribution (including porosity variation). The models were validated with experimental tests.