Tomography and Simulation of Microstructure Evolution of a Closed-Cell Polymer Foam in Compression

Daphalapurkar, Nitin; Hanan, Jay C.; Phelps, Nicholas B.; Bale, Harold D.; Lu, Hongbing

doi:10.1080/15376490802470523

Cited by 59 publications

(50 citation statements)

References 23 publications

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“…The mechanical properties of this material have been studied quite extensively, but mainly focused on mechanical failure [28][29][30][31]. There are, however, older elastic property references [32][33][34], but without extensive material characterization, and other references that do report on elastic properties as a function of microstructure [35][36][37]. This industrial foam was used to support the development and validation of the proposed procedure to quantitatively relate porous microstructure to structural properties.…”

Section: Introductionmentioning

confidence: 98%

X-ray CT imaging and finite element computations of the elastic properties of a rigid organic foam compared to experimental measurements: insights into foam variability

et al. 2015

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A combined computational/experimental technique was developed to analyze the compressive elastic properties of a rigid organic foam. This technique combines X-ray computed tomography, image analysis, and large-scale finite element computations utilizing a new numerical technique. Predictions of Young's modulus were validated with uniaxial compression testing. Good agreement was obtained between imaging/finite element computations and experimental mechanical measurements within experimental error, and the limited knowledge existing on the solid material comprising the backbone of the foam. Using the new combined experimental/theoretical procedures, it was found that the predicted Young's modulus of the solid backbone differed by more than a factor of 100 % between two different grades of the foam, in accordance with the findings of other researchers. A significant variability of the backbone modulus was also found within the same grade. Density measurements identified the variability between different grades of foam and different as-received sample thicknesses within the same grade of foam.

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Section: Introductionmentioning

confidence: 98%

X-ray CT imaging and finite element computations of the elastic properties of a rigid organic foam compared to experimental measurements: insights into foam variability

et al. 2015

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“…This is accomplished by examining a small sample from the foam material with X-ray tomography and then developing FE meshes for the 3D solid volume reconstructed from X-ray tomography data without any approximations or idealization. [21][22][23][24][25][26] The aim of this approach is to obtain a better agreement between the experimental and the simulated results.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Second, the very small thickness of walls in addition to the air voids between these walls has contributed to the unrealistic low values of the Young's modulus yielded from nanoindentation test. More details about the nanoindentation challenges in polymers and foams and its solutions could be found in other studies 24,33,34 Therefore, it was decided that a small sample extracted from the XPS boards would be heated to 200 C and then this sample was manually pressed with the purpose to transform the foam sample to a solid polymer one. Nanoindentation test was then performed on three different positions in the polymer sample.…”

Section: Parent Materials Propertymentioning

confidence: 99%

“…24 Since the solid material here is a polymer, the bulk material can be supposed to exhibit a linear elastic-plastic behavior. 21,24 For the sake of simplicity and since the XPS boards are designed practically so that the applying stresses lies in elastic range of the boards, the solid material are approximated as linear elastic with a constant value of the Young's modulus. An attempt was made to measure the Young's modulus of cell walls by nanoindentation technique.…”

Section: Parent Materials Propertymentioning

confidence: 99%

“…24,27 All literatures surveyed in this research regarding the microstructure of foam materials have revealed that:…”

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Finite element modeling of compression behavior of extruded polystyrene foam using X-ray tomography

Sadek

Fouad

2013

Journal of Cellular Plastics

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Extruded polystyrene rigid foams have attracted a great attention as a superior loadbearing thermal insulation material since their implementation in building construction. One of the most common application areas of this type of thermal insulation material is under raft foundations, where the foam normally undergoes high levels of compression loads. The purpose of this research is to determine how to simulate and optimize the structural response of extruded polystyrene under compression stresses. The optimization has been achieved through investigating the relation between the foam microstructure and the global mechanical properties. The foam was first examined using X-ray tomography imaging technique to acquire some morphological information about the microstructure. The obtained morphological data of extruded polystyrene boards were then utilized to develop microstructure-based finite element models based on the socalled idealized realistic Kelvin cell. The finite element simulation was accomplished with the help of the nanoindentation technology to explore the mechanical properties of the cell wall material. The finite element models were validated by comparisons between the simulated and the experimental results. It has been found that the mechanical properties of the foam in different loading directions can be adequately simulated using the approach of the idealized realistic Kelvin cell. With the help of these models, a parameter study was carried out. This study included the effect of cell size and cell anisotropy on the mechanical response of extruded polystyrene boards under compression stresses. Charts relating between the foam microstructure characteristics and the compression behavior were generated based on the parametric study.

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Advances in Bioceramics and Porous Ceramics

Narayan¹,

Colombo²,

Singh³

et al. 2008

Ceramic Engineering and Science Proceedings

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Tomography and Simulation of Microstructure Evolution of a Closed-Cell Polymer Foam in Compression

Cited by 59 publications

References 23 publications

X-ray CT imaging and finite element computations of the elastic properties of a rigid organic foam compared to experimental measurements: insights into foam variability

X-ray CT imaging and finite element computations of the elastic properties of a rigid organic foam compared to experimental measurements: insights into foam variability

Finite element modeling of compression behavior of extruded polystyrene foam using X-ray tomography

Advances in Bioceramics and Porous Ceramics

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