The effect of a negative Poisson's ratio on thermal stresses in cellular metallic structures

被引：20

作者：

Adler, L. ^{[1
,2
]}

Warmuth, F. ^{[3
]}

Lodes, M. A. ^{[3
]}

Osmanlic, F. ^{[1
,3
]}

Koerner, C. ^{[1
,2
,3
]}

机构：

[1] Friedrich Alexander Univ, Chair Met Sci & Technol WTM, Martensstr 5, D-91058 Erlangen, Germany

[2] Energie Campus Nurnberg,Further Str 250, D-90429 Nurnberg, Germany

[3] Joint Inst Adv Mat & Proc ZMP, Dr Mack Str 81,Technikum 1,Level 3, D-90762 Furth, Germany

来源：

SMART MATERIALS AND STRUCTURES | 2016年 / 25卷 / 11期

关键词：

auxetic effect; negative Poisson's ratio; inhomogeneous heating; cellular structures; FEA simulation; selective electron beam melting (SEBM); additive manufacturing; AUXETIC BEHAVIOR;

D O I：

10.1088/0964-1726/25/11/115038

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

To investigate the influence of auxetic behavior on thermally induced stresses, finite element analysis. simulations of the displacement and stress fields in locally heated three dimensional auxetic and cubic structures are compared. The simulations were carried out in Comsol for a cubic as well as a chiral array of 30 mm length in each spatial dimension (3 x 3 x 3 unit cells). The center cells of these arrays were heated for 20 s. For two boundary conditions (free and clamped), deformation mechanisms are analyzed. It is found, that the auxetic behavior can effectively reduce thermal stresses by internal node rotation and strut bending, especially for constrained (clamped) boundary conditions. A stress reduction of a factor of 3.3 in comparisons to a simple cubic cell array could be evaluated.

引用

页数：9

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