Application of Gurson Model for Evaluation of Density‐Dependent Mechanical Behavior of Polyurethane Foam: Comparative Study on Explicit and Implicit Method

Lee, Jehee; Kim, Seul-Kee; Park, Seong-Bo; Bang, Chang-Seon; Lee, Jae-Myung

doi:10.1002/mame.201500431

Cited by 16 publications

(7 citation statements)

References 27 publications

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“…A multiple regression model was consequently established to anticipate the elasto‐viscoplastic behavior of RPUF at arbitrary strain rates and temperature. Also, Lee et al . established a Gurson model to explore the density‐dependent mechanical behaviors of polyurethane foam, and their simulation results are approximately consistent with the experimental results.…”

Section: Introductionmentioning

confidence: 62%

Failure mechanism of rigid polyurethane foam under high temperature vibration condition by experimental and finite element method

2019

J of Applied Polymer Sci

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The failure mechanism of rigid polyurethane foam (RPUF) under room temperature (RT) and high temperature vibration conditions was investigated by experiment and finite element stimulation. Damaged RPUF specimens were prepared at different vibration amplitudes ranging from 0 to 19.879 mm at RT and 150 °C for different vibration times. The tensile test was utilized to evaluate the vibration damage degree of RPUFs, and the results exhibited that tensile strength decreased gradually with the increase of vibration amplitude and time at both RT and 150 °C. Thermogravimetric analysis and Fourier transform infrared spectroscopy illustrated that thermal degradation of RPUF is attributed to the decomposition of carbonyl urethane groups at 150 °C. The scanning electron microscopy analysis of the tensile fracture surfaces revealed that the vibration failure of RPUF mainly resulted from the existence of microcracks in cell structure. A finite element simulation was established by ABAQUS to study stress distribution of RPUF under different vibration loads, which then demonstrated that the microcracks are most likely to exist on the junction of two microcell units, which is due to convergence of stress in the process of vibration. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48343.

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Section: Introductionmentioning

confidence: 62%

Failure mechanism of rigid polyurethane foam under high temperature vibration condition by experimental and finite element method

2019

J of Applied Polymer Sci

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“…However, as the amount of silica aerogel increased, the density tended to decrease because pores were generated on the top surface, as shown in Figure 4 . This is because in the case of nanoparticles, the dispersion decreases when the added amount is increased [ 5 , 7 ].…”

Section: Resultsmentioning

confidence: 99%

“…As a result, all specimens that were subjected to a cryogenic compression test exhibited a side-breaking phenomenon because of brittle fracture at low temperatures. The lower the temperature during the compression test, the more easily the PUF broke down, even for small forces [ 5 ]. However, at room temperature, no cracking occurred during the compression test, and the sample fully recovered its height.…”

Section: Resultsmentioning

confidence: 99%

“…The RPUF showed improved resistance to permanent deformation and crack propagation [ 4 ]. Lee et al proposed a material constitutive equation by analyzing the mechanical properties of PUF under compressive load and demonstrated the effect of the apparent density in a compression test [ 5 ]. Park et al carried out compressive tests of RPUFs and compared them in terms of the blowing agent (CO 2 and HFC-245fa), temperature, and strain rate.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Silica-Aerogel on Mechanical Characteristics of Polyurethane-Based Composites: Thermal Conductivity and Strength

et al. 2021

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Polyurethane foam (PUF) has generally been used in liquefied natural gas (LNG) carrier cargo containment systems (CCSs) owing to its excellent mechanical and thermal properties over a wide range of temperatures. An LNG CCS must be designed to withstand extreme environmental conditions. However, as the insulation material for LNGC CCSs, PUF has two major limitations: its strength and thermal conductivity. In the present study, PUFs were synthesized with various weight percentages of porous silica aerogel to reinforce the characteristics of PUF used in LNG carrier insulation systems. To evaluate the mechanical strength of the PUF-silica aerogel composites considering LNG loading/unloading environmental conditions, compressive tests were conducted at room temperature (20 °C) and a cryogenic temperature (−163 °C). In addition, the thermal insulation performance and cellular structure were identified to analyze the effects of silica aerogels on cell morphology. The cell morphology of PUF-silica aerogel composites was relatively homogeneous, and the cell shape remained closed at 1 wt.% in comparison to the other concentrations. As a result, the mechanical and thermal properties were significantly improved by the addition of 1 wt.% silica aerogel to the PUF. The mechanical properties were reduced by increasing the silica aerogel content to 3 wt.% and 5 wt.%, mainly because of the pores generated on the surface of the composites.

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“…Polyurethane foam has a relatively high thermal coefficient, which is approximately 60.0E‐06 per °C. Additionally, hydrostatic pressure and gravity of the LNG induces a compressive force on the polyurethane foam against the tank . Figure shows that structure of LNG storage tank and load conditions at polyurethane foam layer.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

Son

Kim

Choi

et al. 2019

Macro Materials & Eng

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Polyurethane foams, which are among the most widely used insulating materials, are generally fabricated by the chemical reaction between isocyanate and polyol‐containing chemical additives and blowing agents. Recently, many kinds of blowing agents have been used for the fabrication process of polyurethane foam, such as hydrochlorofluorocarbons (HCFCs) and chlorofluorocarbons (CFCs). However, issues have continuously arisen regarding the destruction of the ozone layer due to these compounds. In the present study, polyurethane foams are manufactured using a mixture of water blowing agents and hydrofluorocarbons (HFC‐365mfc). These samples are subjected to mechanical tests to investigate the effects of the blowing agents on the mechanical properties of the polyurethane foam within a temperature range of 25 to −163 °C. In addition, thermal and microstructural investigations are conducted depending on the content of the HFC‐365mfc. From the scanning electron microscopy observations, the sizes of the structure cells and the windows are found to decrease with the increase in HFC‐365mfc content. In addition, from the Fourier transform‐infrared spectroscopy observations, the chemical bonds that affect mechanical performance are found to be more distributed with the increase in HFC‐365mfc content.

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Application of Gurson Model for Evaluation of Density‐Dependent Mechanical Behavior of Polyurethane Foam: Comparative Study on Explicit and Implicit Method

Cited by 16 publications

References 27 publications

Failure mechanism of rigid polyurethane foam under high temperature vibration condition by experimental and finite element method

Failure mechanism of rigid polyurethane foam under high temperature vibration condition by experimental and finite element method

Influence of Silica-Aerogel on Mechanical Characteristics of Polyurethane-Based Composites: Thermal Conductivity and Strength

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

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