Microstructure and Tensile Mechanical Properties of Anisotropic Rigid Polyurethane Foam

Ridha, M.; Shim, V.P.W.

doi:10.1007/s11340-008-9146-0

Cited by 69 publications

(55 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shape anisotropy ratio generally decreases with increasing foam density [8]. In the case of closed-cell rigid PU foams, R decreases from 2.5 to 1.7 by increasing the foam density by 1.5 times [9]. By reducing the relative density down to 11-13%, R is about 1.6, which is very close to the stiffness anisotropy (1.7), [10].…”

Section: Introductionmentioning

confidence: 58%

Shape Memory Behavior of PET Foams

2018

View full text Add to dashboard Cite

Shape memory properties of PET (polyethylene-terephthalate) foams have been evaluated for two different foam densities. Samples were subjected to multiple memory-recovery cycles along three different directions to measure the effect of foam anisotropy on static mechanical and shape memory properties. The memory cycle was performed by uniaxial compression tests at room temperature. Despite these severe conditions, PET foams demonstrated very good shape memory behavior with shape recovery always higher than 90%. Due to cycling, the mechanical performance of foam samples is partially reduced, mainly along the extrusion direction of the foam panels. Despite this loss of static performance, shape memory properties are only partially affected by thermo-mechanical cycles. The maximum reduction is 10% for shape fixity and 3% for shape recovery. The experimental results are particularly interesting considering that compression tests were undertaken at room temperature. Indeed, PET foams seem to be optimal candidates for self-repairing structures.

show abstract

Section: Introductionmentioning

confidence: 58%

Shape Memory Behavior of PET Foams

2018

View full text Add to dashboard Cite

show abstract

“…7. When compressed parallel to the direction of pore elongation, the sample can endure the applied load more efficiently because of an increase in the active resisting area of HA walls which are parallel to the loading direction, marked by the black lines [15,20]. In addition, the creation of elongated pores can decrease the wall length (l) which is one of the most important parameters determining the fracture of the HA walls, leading to a higher compressive strength [15,21].…”

Section: Resultsmentioning

confidence: 99%

Preparation of the reticulated hydroxyapatite ceramics using carbon-coated polymeric sponge with elongated pores as a novel template

Sung

Shin

Koh

et al. 2011

Ceramics International

View full text Add to dashboard Cite

“…12 Toward more accurate foam modeling, some researches 13,14 have modeled the foam microstructure by anisotropic idealized Kelvin cells.…”

Section: Literature Reviewmentioning

confidence: 99%

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

Sadek

Fouad

2013

Journal of Cellular Plastics

View full text Add to dashboard Cite

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.

show abstract

Microstructure and Tensile Mechanical Properties of Anisotropic Rigid Polyurethane Foam

Cited by 69 publications

References 29 publications

Shape Memory Behavior of PET Foams

Shape Memory Behavior of PET Foams

Preparation of the reticulated hydroxyapatite ceramics using carbon-coated polymeric sponge with elongated pores as a novel template

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

Contact Info

Product

Resources

About