Investigation of the Mechanical Behavior of Open-Cell Ni Foams by Experimental and FEM Procedures†

摘要: Cellular materials such as wood, bone and other living tissues are frequently encountered in nature. Metal foams a relatively new class of recyclable various methods manufacturing technologies developed recently for their production. increasingly used many engineering applications due to low weight combination with increased heat transfer potential mechanical strength. The behavior cellular structures is governed by internal architecture. Given the wide range applications, automotive, building industries, study mechanicalbehavior metal considered imperative. Several analytical numerical approaches can be found literature. Analytical models based on beam theory have been derived Gibson Ashby giving effective properties functions structure’s relative density. Finite Element simulations elements analyzing stiffness open cell metallic tetrakaidecahedral unit cells. In Gong Kyriakides, et al., linear nonlinear compressive response polyester urethane modeled using idealized periodic consisting analyses stress–strain two-dimensional foam model elastic regime presented Hohe Becker. Various three-dimensional studied Luxner [13] microfield approach. X-ray tomography has proved very powerful tool allowing characterization microstructure or architecture materials. allows large deformations solids imaged non destructive way: thus important buckling, bending fracture events appearing during deformation visualized. majority theoretical which relate structure refer models, while most random There cases where results good agreement real However, not periodic, there need develop taking into consideration this aspect. paper, elastoplastic Nickel opencell investigated under tension loads. A scanning electron microscope equipped an apparatus microtension was used. Ex-situ in-situ micro-tension tests were conducted. latter determination through real-time observations local struts, correlating them imposed. High resolution tomographies, carried out capture exact 3D geometry turn simulate aid computational procedure Modeling (FEM). porous causes microscopic stress localization loading, reduces overall strength therefore limits application present also allow visualization stresses foam.