Assessment of collapse diagrams of rigid polyurethane foams under dynamic loading conditions

Linul, Emanoil; Şerban, Dan Andrei; Marșavina, Liviu; Sadowski, Tomasz

doi:10.1016/j.acme.2016.12.009

Cited by 68 publications

(24 citation statements)

References 20 publications

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“…Regardless of semi-rigid PU foam type (unreinforced or reinforced), each foam sample is characterized by similar quasi-static compression behavior, exhibiting three different regions: A narrow linear-elastic region (< 5% strain), followed by a stress-plateau region (around 10–40%), and ending with a densification region (over 40% strain) [42,43,44].…”

Section: Resultsmentioning

confidence: 99%

Compressive Behavior of Aluminum Microfibers Reinforced Semi-Rigid Polyurethane Foams

2018

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Unreinforced and reinforced semi-rigid polyurethane (PU) foams were prepared and their compressive behavior was investigated. Aluminum microfibers (AMs) were added to the formulations to investigate their effect on mechanical properties and crush performances of closed-cell semi-rigid PU foams. Physical and mechanical properties of foams, including foam density, quasi-elastic gradient, compressive strength, densification strain, and energy absorption capability, were determined. The quasi-static compression tests were carried out at room temperature on cubic samples with a loading speed of 10 mm/min. Experimental results showed that the elastic properties and compressive strengths of reinforced semi-rigid PU foams were increased by addition of AMs into the foams. This increase in properties (61.81%-compressive strength and 71.29%-energy absorption) was obtained by adding up to 1.5% (of the foam liquid mass) aluminum microfibers. Above this upper limit of 1.5% AMs (e.g., 2% AMs), the compressive behavior changes and the energy absorption increases only by 12.68%; while the strength properties decreases by about 14.58% compared to unreinforced semi-rigid PU foam. The energy absorption performances of AMs reinforced semi-rigid PU foams were also found to be dependent on the percentage of microfiber in the same manner as the elastic and strength properties.

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Section: Resultsmentioning

confidence: 99%

Compressive Behavior of Aluminum Microfibers Reinforced Semi-Rigid Polyurethane Foams

2018

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“…The shape of the plateau region represents an important factor in the selection of cellular materials for energy absorption applications. Due to the cell-walls collapse mechanisms, during this stage, the largest amount of energy at an almost constant load occurs [ 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

On the Lateral Compressive Behavior of Empty and Ex-Situ Aluminum Foam-Filled Tubes at High Temperature

2018

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In this research work, the effect of lateral loading (LL) on the crushing performance of empty tubes (ETs) and ex situ aluminum foam-filled tubes (FFTs) was investigated at 300 °C. The cylindrical thin-walled steel tube was filled with the closed-cell aluminum alloy foam that compressed under quasi-static loading conditions. During the compression test, the main mechanical properties of the ETs improved due to the interaction effect between the cellular structure of the foam and the inner wall of the empty tube. In addition, the initial propagated cracks on the steel tubes reduced considerably as a result of such interaction. Furthermore, the obtained results of the LL loading were compared with the axial loading (AL) results for both ETs and FFTs at the same temperature. The findings indicated that the application of loading on the lateral surface of the composite causes the lower mechanical properties of both ETs and FFTs in comparison with the axial loading conditions.

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“…e authors of [11][12][13][14] studied the stressstrain behavior, microstructure characteristics, fatigue behaviour, and failure mode of RPU grouting materials under uniaxial compression, dynamic compression, and cyclic loading. Studies have shown that RPU grout materials with different densities show elastoplastic or atypical brittle characteristic; the main mechanical properties increase with increasing of density.…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of Polymer Grouting Material Microstructure

Wang

Fang

et al. 2020

Advances in Civil Engineering

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The two-component foaming polyurethane is a kind of grouting material that has recently been widely used in engineering structural repair. Its physical and mechanical properties are closely related to its microstructure. Therefore, the qualitative and quantitative analysis of polymer microstructure has always been a research hotspot. The statistical characteristics of polymer grouting material microstructure are investigated by six groups of specimens with different densities, and the density varies from 0.1 to 0.6 g/cm3. The microstructure morphology of polymer was observed and described by scanning electron microscopy (SEM), and the microstructure feature parameters were extracted and calculated by image processing technology. The quantitative analysis of section cell roundness distribution, cell diameter distribution, and polymer porosity shows that low-density polymer materials have anisotropy. While the density exceeds 0.3 g/cm3, the cell structure tends to be spherical. The section cell diameters obey a normal distribution, and when the density increases, the cell diameter decreases. The porosity of the polymer has a linear negative correlation with the density. The polymer matrix has a density of 1.21 g/cm3. The microstructural information obtained in this study will help establish a cell-based model to explain the mechanical response of rigid polymer foams.

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Assessment of collapse diagrams of rigid polyurethane foams under dynamic loading conditions

Cited by 68 publications

References 20 publications

Compressive Behavior of Aluminum Microfibers Reinforced Semi-Rigid Polyurethane Foams

Compressive Behavior of Aluminum Microfibers Reinforced Semi-Rigid Polyurethane Foams

On the Lateral Compressive Behavior of Empty and Ex-Situ Aluminum Foam-Filled Tubes at High Temperature

Statistical Characteristics of Polymer Grouting Material Microstructure

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