Internal friction in metallic foams and some related cellular structures

Golovin, I.S.; Sinning, H.‐R.

doi:10.1016/j.msea.2003.08.083

Cited by 50 publications

(48 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It has been argued that the excellent damping properties of metal foams are related to their anelastic nature. [18][19][20] This property is also expected to affect deformation under cyclic loading. As shown in Figure 9, metal foams display time-dependent plastic backflow, and this will play an important role in determining the fatigue properties.…”

Section: Discussionmentioning

confidence: 99%

Effect of Lateral Constraint on the Mechanical Properties of a Closed-Cell Al Foam: Part II. Strain-Hardening Models

Karthikeyan

Kolluri

Ramamurty

2007

Metall Mater Trans A

View full text Add to dashboard Cite

Experimental results, presented in the companion article, show that the compressive deformation of a closed-cell Al foam under lateral constraint is characterized by significant strain hardening. This enhanced hardening is due to the change in stress state from uniaxial to triaxial, which additionally contributes to friction between the deforming foam and the walls of the constraining sleeve. Detailed analysis, employing two different types of deformation models, is presented in this article in order to rationalize the experimental observations. In the heterogeneous model, it is assumed that plastic deformation is similar with and without constraint and that it occurs via collective plastic collapse of cells. The bands, thus formed, elastically bear the lateral stresses and give rise to friction. In the homogeneous deformation model, it is assumed that the deformation mode is different under constraint and involves uniform densification, which leads to inherent hardening as well as additional friction. By comparing the model predictions with experimental observations, it is suggested that the plastic strain hardening of the metallic foam under constraint is due, in equal measure, to the triaxial state of stress and friction. Mechanistically, the material deforms principally by collective cell collapse, though there is some evidence of concurrent homogeneous deformation.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of Lateral Constraint on the Mechanical Properties of a Closed-Cell Al Foam: Part II. Strain-Hardening Models

Karthikeyan

Kolluri

Ramamurty

2007

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…Open porosity foams are multifunctional materials due to their unique properties combining high specific strength and stiffness [1,2] with light weight and excellent energy absorption [3,4]. Structural parameters of commercially available foams such as porosity, specific surface, mean strut diameter and mean pore diameter are commonly studied with use of μCT [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Design of Mechanical Properties of Open-Cell Porous Materials Based on μCT Study of Commercial Foams

Skibiński

Ćwieka

Wejrzanowski

et al. 2015

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. In the present paper numerical design of mechanical properties of open-cell porous materials is addressed. A detailed knowledge of mechanisms and parameters determining mechanical properties (i.e. Young's Modulus, Poisson's Ratio) of foams is essential for applications such as energy absorbers or lightweight construction materials. The foam structures were designed using procedure based on Laguerre-Voronoi tessellations (LVT) with microcomputed tomography of commercial foams used as reference. Foam morphology was studied on post-processed computed tomography images and the parameters of LVT structures were compared with commercial materials. Subsequently finite element method (FEM) calculations were performed on both types of structures to validate the LVT design algorithm. The results show that the described design procedure can be successfully used for modeling mechanical properties of open-cell foam structures.

show abstract

“…1) Recently, it has been reported that the damping capacities of porous metals are enhanced, compared with those of dense materials. [2][3][4][5][6][7][8][9][10] Although pure Al or Al alloy is essentially a low damping material, [11][12][13] porous Al is of considerable practical interest as a damping material in severe conditions because of its lightweight and good corrosion resistance as well as its excellent damping capacity. In general, pore characteristics, such as porosity, pore size and pore shape, of the porous structure influence the damping capacity of cellular metallic materials.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are some discrepancies in the dependence of the damping capacity on the pore characteristics. [3][4][5][6][7][8][9] Past relevant studies have mostly focused on the mechanical damping of foamed Al. [3][4][5]7) Foamed Al often suffers from heterogeneous pore characteristics because control of bubble expansion in liquid or semisolid metal is difficult.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the porous Al in the previous studies often had pores as large as millimeters. [3][4][5][6][7][8] The spacer method (or replication method), which has been employed since the 1960s, is one of the methods for fabricating porous Al. [14][15][16][17][18][19] Features of the spacer method are: (1) strict control of the porosity and pore size, and (2) distribution of homogeneous pores and small pores.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

et al. 2009

View full text Add to dashboard Cite

The room-temperature damping properties of porous aluminum fabricated by the spacer method were investigated using the method of lateral resonant vibration in cantilever holding. In particular, the effects of the porosity and pore size, which are the representative parameters of porous metals and can be controlled well by spacer method, on the damping properties were focused on. The damping capacity increased with increasing porosity and pore size. Local stress concentration arising from the heterogeneity of porous structures seems responsible for the enhanced damping capacity under the condition in which the main damping mechanism is amplitude-dependent dislocation damping. The present results point out the importance of the porous structure control in damping properties.

show abstract

Internal friction in metallic foams and some related cellular structures

Cited by 50 publications

References 18 publications

Effect of Lateral Constraint on the Mechanical Properties of a Closed-Cell Al Foam: Part II. Strain-Hardening Models

Effect of Lateral Constraint on the Mechanical Properties of a Closed-Cell Al Foam: Part II. Strain-Hardening Models

Design of Mechanical Properties of Open-Cell Porous Materials Based on μCT Study of Commercial Foams

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

Contact Info

Product

Resources

About