Impact response of shear thickening fluid filled polyurethane foam core sandwich composites

Caglayan, Cigdem; Osken, Ipek; Ataalp, Altuğ; Türkmen, Halit S.; Cebeci, Hülya

doi:10.1016/j.compstruct.2020.112171

Cited by 48 publications

(27 citation statements)

References 22 publications

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“…The ranges of specific compressive strengths of PU foams were from 0.0082 to 0.0795 kPa·m 3 /kg and 0.0056 to 0.0704 kPa·m 3 /kg in the vertical and parallel directions, respectively. In previous studies, the specific compressive strength of PU foams reinforced with organic filler ranged from 0.0049 to 0.0073 kPa·m 3 /kg [ 39 , 40 ]. The specific compressive strengths of the bio-based PU foams were much higher than those of PU foams in previous studies [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

The Influence of Neem Oil and Its Glyceride on the Structure and Characterization of Castor Oil-Based Polyurethane Foam

Liao

Chen

2021

Polymers

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Neem (Azadirachta indica) oil is a non-edible oil that contains azadirachtin, which can be used as a biopesticide. This study synthesizes bio-based polyurethane (PU) foam from neem and castor (Ricinus communis L.) oil at normal temperature and pressure. Neem oil can be reacted to narrow-distribution polyol by transesterification of oil and glycerol. Neem oil glyceride (NOG) can be used as polyol for bio-based PU foams and can be blended with castor oil homogeneously to reduce the cost of production. The composition of polyol was castor oil and 0 to 20% molar ratios of NOG. Hexamethylene diisocyanate trimer (Desmodur N) was used as isocyanate. The molar ratios of NCO/OH were set as 1.0, 1.5 and 2.0. The average hydroxyl contents of castor oil, neem oil and NOG were 2.7 mmol/g, 0.1 mmol/g and 5.1 mmol/g, respectively. The reaction time of bio-based PU foam could be adjusted between 5 to 10 min, which is acceptable for manufacturing. The densities of PU foams were between 49.7 and 116.2 kg/m3 and decreased with increasing NCO/OH and NOG ratios and decreasing neem oil. The ranges of specific compressive strength of foams were from 0.0056 to 0.0795 kPa·m3/kg. Increasing the NOG and neem oil ratio significantly enhanced the specific compressive strength in the low NCO/OH ratio. The solvent resistance and thermogravimetric (TG) results showed that the foams have high water and thermal stability. NOG can help to increase solvent resistance. Adding neem oil reduces the solvent resistance. The results indicated that increasing NCO/OH and NOG ratios increases the cross-linking density and hard segment content of PU foams. This investigation demonstrated that castor oil-based PU foams are improved by adding NOG to the polyol mixture. PU foam has excellent properties. Neem oil can be used in manufacturing processes to produce high-performance foams via a green synthesis process.

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Section: Resultsmentioning

confidence: 99%

The Influence of Neem Oil and Its Glyceride on the Structure and Characterization of Castor Oil-Based Polyurethane Foam

Liao

Chen

2021

Polymers

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“…The deformation modes of cellular media under dynamic load are significantly different from that under quasi-static load. Cellular media have obvious deformation localization and stress enhancement under dynamic load [ 59 , 60 , 61 , 62 ].…”

Section: Characterization Of Cellular Medium Mechanical Propertiesmentioning

confidence: 99%

A Review on Mechanical Models for Cellular Media: Investigation on Material Characterization and Numerical Simulation

et al. 2021

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Cellular media materials are used for automobiles, aircrafts, energy-efficient buildings, transportation, and other fields due to their light weight, designability, and good impact resistance. To devise a buffer structure reasonably and avoid resource and economic loss, it is necessary to completely comprehend the constitutive relationship of the buffer structure. This paper introduces the progress on research of the mechanical properties characterization, constitutive equations, and numerical simulation of porous structures. Currently, various methods can be used to construct cellular media mechanical models including simplified phenomenological constitutive models, homogenization algorithm models, single cell models, and multi-cell models. This paper reviews current key mechanical models for cellular media, attempting to track their evolution from their inception to their latest development. These models are categorized in terms of their mechanical modeling methods. This paper focuses on the importance of constitutive relationships and microstructure models in studying mechanical properties and optimizing structural design. The key issues concerning this topic and future directions for research are also discussed.

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“…Threshold of Curing Temperature. Water is one of the most widely used and cheapest chemical foaming agents in the polyurethane industry, and the proportion of its content directly affects the size and severity of the heat release amount of the polymer foaming reaction [24][25][26]. In this paper, in order to discuss the influence of the weight proportion of water on the curing temperature threshold of polymer, the experiment weight proportion scheme of water is shown in Table 1, and the experimental results are shown in Figure 5.…”

Section: Effect Of the Weight Proportion Of Foaming Agent On Thementioning

confidence: 99%

Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

Zhang

Wang

Zhong

et al. 2021

Advances in Polymer Technology

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Polyurethane polymer grouting material has been effectively applied and promoted in the repair of road damages in nonfrozen areas. However, this material undergoes an exothermic reaction in the curing stage, which can cause a thermal disturbance in the frozen soil subgrade. To minimize the influence of the thermal disturbance of the polyurethane polymer grouting material in the repair of the frozen soil subgrade, an experiment was conducted to reduce the heat of the curing reaction under the influence of different proportions of a foaming agent, high-boiling point solvent, catalyst, and prepolymer. According to these test results, a proportioning scheme for the low exothermic polymer grouting material was formulated. The results indicated that the curing reaction temperature threshold of the polyurethane polymer grouting material was negatively related to the proportion of physical foaming agent (HCFC-141b) and high-boiling point solvent and positively related to the proportion of water weight. In the three stages of rapid temperature rise, slow temperature rise, and constant temperature, the rate of the temperature rise of the low exothermic polymer grouting material was lower than that of the common polymer, and the curing temperature threshold was 30.34% lower at a value of 101°C. At a density of 80 kg/m3, the compressive strength and tensile strength of the low heat release polymer grouting material were lower than those of the common polymer grouting material, thereby ensuring the excellent performance of polyurethane foam and providing a theoretical reference for the rapid repair of frozen soil roadbed diseases.

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Impact response of shear thickening fluid filled polyurethane foam core sandwich composites

Cited by 48 publications

References 22 publications

The Influence of Neem Oil and Its Glyceride on the Structure and Characterization of Castor Oil-Based Polyurethane Foam

The Influence of Neem Oil and Its Glyceride on the Structure and Characterization of Castor Oil-Based Polyurethane Foam

A Review on Mechanical Models for Cellular Media: Investigation on Material Characterization and Numerical Simulation

Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

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