Investigation of the fatigue behavior of open cell foams by a micromechanical 3-D model

被引:12
作者
Demiray, Serkan [1 ]
Becker, Wilfried [1 ]
Hohe, Joerg [2 ]
机构
[1] Tech Univ Darmstadt, Fachgebiet Strukrumechan, D-64289 Darmstadt, Germany
[2] Fraunhofer Inst Werkstoffmech, D-79108 Freiburg, Germany
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 504卷 / 1-2期
关键词
Fatigue; Metal foam; Homogenization; Modelling; DAMAGE ACCUMULATION; TRABECULAR BONE; ALUMINUM FOAMS; HONEYCOMBS; ALLOY;
D O I
10.1016/j.msea.2008.10.036
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This work is concerned with an analysis of fatigue damage accumulation and failure of open cell metal foams. For an efficient numerical analysis, a failure event based simulation procedure is proposed, which considers the failure of individual struts as particular discrete failure events governing the degradation of the foam microstructure during cyclic loading. In a simplifying approach the cyclic stress-strain-response between the discrete failure events is assumed to be independent of time. In conjunction with Miner's rule for the description of the fatigue damage accumulation within the individual struts a numerically efficient computational scheme is obtained, requiring the simulation of only a limited number of cycles. The microscopic results are transferred to the macroscopic level by means of a strain energy based homogenization procedure. In a number of parametric studies on the fatigue behavior of Kelvin foams and a comparison with experimental data, the proposed computational scheme proves to be both accurate and numerically efficient. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:141 / 149
页数:9
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