The tensile ductility of cellular Solids: The role of imperfections

详细信息    查看全文

• 作者：William Ronan¹ ; Vikram S. Deshpande ; Norman A. Fleck ; ^{naf1@eng.cam.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Cellular foams ; Elastic plastic solids ; Finite element ; Foam structures ; Micro-mechanics ; Stress strain ; Tension
• 刊名：International Journal of Solids and Structures
• 出版年：2016
• 出版时间：15 December 2016
• 年：2016
• 卷：102-103
• 期：Complete
• 页码：200-213
• 全文大小：5275 K

文摘

Metallic and polymeric foams typically possess a low tensile failure strain of a few percent despite the fact that the parent solid can have high ductility (10% or more). This is remarkable as foams are bending-dominated in their structural response, and it is widely accepted that beams have a high ductility in bending compared to a bar in uniaxial tension. Possible reasons for this paradox are explored for a 2D hexagonal honeycomb, and for a so-called ‘lotus cellular material’, made from an elastic-plastic parent solid. Finite element simulations reveal that there is only a small drop in tensile ductility due to the presence of Plateau borders or due to the random misalignment of nodes; a much greater drop in ductility results from missing cell walls (equivalent to misshapen cells) or to the presence of stiff inclusions. The drop in ductility due to inclusions is associated with the multi-axial stress state that exists in their vicinity. This study emphasises the need for a uniform microstructure in order for foams to possess a high macroscopic ductility.