Characterization of edge effects in cellular materials

Brezny, Rasto; Green, D. J.

doi:10.1007/bf01129908

Cited by 71 publications

(45 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We note that the normalized strength decreases more rapidly with decreasing¸/d for the open-cell than the closed-cell foam, again, due to the e!ect of the cell faces. Both our data and models suggest that the bulk values of both Young's modulus and strength are reached at values of¸/d of about 5}8, lower than the value of 15 suggested by Brezny and Green [12]. The discrepancy may be due to a di!erence in test methods.…”

Section: Uniaxial Compressionmentioning

confidence: 40%

See 1 more Smart Citation

Size effects in ductile cellular solids. Part II: experimental results

Andrews

Gioux

Onck

et al. 2001

International Journal of Mechanical Sciences

510

234

View full text Add to dashboard Cite

There is increasing interest in the use of metallic foams in a variety of applications, including lightweight structural sandwich panels and energy absorption devices. In such applications, the mechanical response of the foams is of critical importance. In this study, we have investigated the e!ect of specimen size (relative to the cell size) on selected mechanical properties of aluminum foams. Models, described in the companion paper, provide a physical basis for understanding size e!ects in metallic foams. The models give a good description of size e!ects in metallic foams.

show abstract

Section: Uniaxial Compressionmentioning

confidence: 40%

“…Five di!erent thicknesses of specimen were tested (6,12,18,24, and 30 mm); the ratio of length to thickness was constant at l/t"12. All of the specimens were of constant width of 50 mm.…”

Section: Shear Testsmentioning

confidence: 99%

Size effects in ductile cellular solids. Part II: experimental results

Andrews

Gioux

Onck

et al. 2001

International Journal of Mechanical Sciences

510

234

View full text Add to dashboard Cite

show abstract

“…We also expect that in an open-cell foam, as in the honeycomb, there are stress-free cut edges at the surface layer. We model both e!ects by considering a square prismatic specimen of foam of width L and cell size dH (¸" dH), following the method of Brezny and Green [6]. Well away from the outer surface, in the core of the material, the material has a Young's modulus E @SJI .…”

Section: Discussionmentioning

confidence: 99%

“…Both e!ects lead to decreasing moduli as specimen size relative to the cell size decrease. The e!ect of a change in constraint at the boundaries has been modelled for #exural specimens by assuming that the inner region of the specimen has the modulus of the bulk material while the outer region has a reduced modulus, re#ecting the reduced constraint [6]. The model gives a good description of the e!ect of the ratio of cell size to specimen size on the measured Young's modulus of reticulated vitreous carbon foams.…”

Section: Introductionmentioning

confidence: 99%

Size effects in ductile cellular solids. Part I: modeling

Onck

Andrews

Gibson

2001

International Journal of Mechanical Sciences

358

185

View full text Add to dashboard Cite

In the mechanical testing of metallic foams, an important issue is the e!ect of the specimen size, relative to the cell size, on the measured properties. Here we analyze size e!ects for the modulus and strength of regular, hexagonal honeycombs under uniaxial and shear loadings. Size e!ects for indentation of a honeycomb are evaluated using "nite element analysis. Finally, the results for honeycombs are extrapolated to foams. The results are compared with data for metallic foams in the following, companion paper.

show abstract

“…6) Brezny and Green 7) investigated edge effects in a reticulated vitreous carbon and they showed that there is a critical specimen to cell size ratio for accurate evaluation of mechanical properties of a cellular material. Onck et al 8) analyzed the effects of specimen size relative to cell size in ductile cellular materials using the finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Effects of Specimen Size Parameters on Compressive and Tensile Properties in a Closed Cell Al Foam

et al. 2003

View full text Add to dashboard Cite

Effects of specimen size parameters, i.e. the specimen volume and the ratio of cross sectional dimension to cell size, on compressive and tensile properties were investigated in a closed cell Al foam. For compressive tests, the stress in a plateau region decreased with decreasing specimen volume. This is likely because constraint of cell walls at the free surface is reduced with decreasing specimen volume. The scatter of the stress was large for the small volume specimens. The critical ratio of cross sectional dimension to cell size was 4 for negligible scatter of the stress. For tensile tests, the ultimate tensile strength decreased, the elongation to failure increased and the work hardening coefficient decreased with decreasing specimen volume. It is suggested that the reduced constraint of cell walls at the free surface by decreasing specimen volume affects the tensile strength as well as the compressive strength.

show abstract

Characterization of edge effects in cellular materials

Cited by 71 publications

References 2 publications

Size effects in ductile cellular solids. Part II: experimental results

Size effects in ductile cellular solids. Part II: experimental results

Size effects in ductile cellular solids. Part I: modeling

An Experimental Investigation of Effects of Specimen Size Parameters on Compressive and Tensile Properties in a Closed Cell Al Foam

Contact Info

Product

Resources

About