Design and validation of a new fixture for the shear testing of cellular solids

Diel, Sergej; Huber, Otto; Steinmann, Paul; Winter, Werner

doi:10.1007/s00419-013-0801-2

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…Classical shear test methods such as torsion of thin‐walled tubes (see Figure G) or simple shear tests according to ASTM C‐273 (see Figure C) were performed, but especially the tests on thin‐walled tubes are limited by the pore size to wall thickness‐ratio. A pure and uniform shear stress state along the perimeter of the foam tube with a neglect of the stress gradient is only a valid assumption if the tube's wall thickness is small enough compared to the radius of the tube . A foam tube should provide at least 6 pores over the tube thickness to neglect size effects, but this can no longer be considered as thin for common pore sizes, so that the shear stress is not constant over the thickness …”

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

“…Pure shear tests on aluminum foams or PVC foams were conducted using a modified picture‐frame shear fixture (see Figure I), which can be used in conjunction with a universal testing machine. Similar adaptations to universal testing machines are described by the Iopescu shear test fixture and the Arcan shear test fixture (see Figure H), which were both very popular for the characterization of fiber‐composite materials.…”

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

“…A pure and uniform shear stress state along the perimeter of the foam tube with a neglect of the stress gradient is only a valid assumption if the tube's wall thickness is small enough compared to the radius of the tube. [95] A foam tube should provide at least 6 pores over the tube thickness to neglect size effects, but this can no longer be considered as thin for common pore sizes, so that the shear stress is not constant over the thickness. [92] Pure shear tests on aluminum foams [96] or PVC foams [95] were conducted using a modified picture-frame shear fixture (see Figure 3I), which can be used in conjunction with a universal testing machine.…”

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

“…[95] A foam tube should provide at least 6 pores over the tube thickness to neglect size effects, but this can no longer be considered as thin for common pore sizes, so that the shear stress is not constant over the thickness. [92] Pure shear tests on aluminum foams [96] or PVC foams [95] were conducted using a modified picture-frame shear fixture (see Figure 3I), which can be used in conjunction with a universal testing machine. Similar adaptations to universal testing machines are described by the Iopescu shear test fixture [97] and the Arcan shear test fixture (see Figure 3H), [98] which were both very popular for the characterization of fiber-composite materials.…”

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

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Yield surfaces for solid foams: A review on experimental characterization and modeling

Jung

Diebels

2018

GAMM-Mitteilungen

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Solid foams are a very important class of lightweight materials with energy absorption properties for application in automotive and aerospace industry. In such applications, foams are subjected not only to uniaxial but in most cases to very complex multiaxial stress states. Hence, yield surfaces are needed for the reliable prediction of the failure behavior by simulations under multiaxial loading. As multiaxial loading of cellular solids is a very challenging task, in literature, yield surfaces are usually based mainly on simulation results not validated by real experimental data sets. The present contribution starts with a review of the theory of yield surfaces and numerical models. It gives a deep insight into the state of the art on the experimental assessment of yield surfaces for solid foams. Finally, a yield surface and its post‐yield surfaces are determined exemplarily for open‐cell aluminum foams by using a multitude of experimental methods.

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Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

Section: Experimental Determination Of Yield Surfaces For Solid Foamsmentioning

confidence: 99%

See 2 more Smart Citations

Yield surfaces for solid foams: A review on experimental characterization and modeling

Jung

Diebels

2018

GAMM-Mitteilungen

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“…Epoxy resin enables a good connection with glass granules without specific coatings. The quasi-static shear properties of this cellular composite are investigated in [ 11 ] using a new shear test fixture, which is particularly suitable for the testing of cellular solids [ 12 ]. This shear test fixture is an extended version of a picture-frame shear fixture, and allows for comparatively thick rectangular block specimens.…”

Section: Introductionmentioning

confidence: 99%

A Continuum Damage Mechanics Model for the Static and Cyclic Fatigue of Cellular Composites

Diel

Huber

2017

Materials

Self Cite

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The fatigue behavior of a cellular composite with an epoxy matrix and glass foam granules is analyzed and modeled by means of continuum damage mechanics. The investigated cellular composite is a particular type of composite foam, and is very similar to syntactic foams. In contrast to conventional syntactic foams constituted by hollow spherical particles (balloons), cellular glass, mineral, or metal place holders are combined with the matrix material (metal or polymer) in the case of cellular composites. A microstructural investigation of the damage behavior is performed using scanning electron microscopy. For the modeling of the fatigue behavior, the damage is separated into pure static and pure cyclic damage and described in terms of the stiffness loss of the material using damage models for cyclic and creep damage. Both models incorporate nonlinear accumulation and interaction of damage. A cycle jumping procedure is developed, which allows for a fast and accurate calculation of the damage evolution for constant load frequencies. The damage model is applied to examine the mean stress effect for cyclic fatigue and to investigate the frequency effect and the influence of the signal form in the case of static and cyclic damage interaction. The calculated lifetimes are in very good agreement with experimental results.

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Shear properties of composite cross-laminated bamboo panels

Xia

Shi

et al. 2022

Eur. J. Wood Prod.

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Design and validation of a new fixture for the shear testing of cellular solids

Cited by 7 publications

References 25 publications

Yield surfaces for solid foams: A review on experimental characterization and modeling

Yield surfaces for solid foams: A review on experimental characterization and modeling

A Continuum Damage Mechanics Model for the Static and Cyclic Fatigue of Cellular Composites

Shear properties of composite cross-laminated bamboo panels

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