Modeling Creep Relaxation of Polytetrafluorethylene Gaskets for Finite Element Analysis

Bharadwaj, Madhu; Claramunt, Santiago; Srinivasan, Sowmianarayanan

doi:10.18178/ijmmm.2017.5.2.302

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…Curve-fitting techniques, as shown in Fig. 5, were used for the extraction of stress and modulus of elasticity)from the strain-time curve using the Maxwell method (spring and dashpot in series) [11].…”

Section: Resultsmentioning

confidence: 99%

“…The modulus of elasticity vs time graphs for all reinforcements in the alkali medium are shown in Fig. (11). The composite with 0.8 wt.% had a higher percentage of modulus of elasticity in the alkali medium compared with other weight fractions, recording a 2.32 % improvement in modulus of elasticity as compared with pure polyester.…”

Section: Fig 11 Modulus Of Elasticity Vs Time For Polyester Reinforce...mentioning

confidence: 97%

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Effect of Immersion Media for Polyester Composite Reinforced with Chicken Feathers on Creep Behavior

Abed¹,

Battawi²,

Khuder³

2022

sv-jme

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The use of composite materials has expanded in industrial applications around the world, reinforcing composites with waste materials like (chicken feather) is one of the effective ways to solve environmental concerns compared to traditional methods, as it is considered one of the renewable and inexpensive methods in addition to its presence in abundance. The main added features of composite materials over classic materials are the light-weight. This paper investigates the effect of immersion media for a polyester composite reinforced with chicken feather fillers to enhance the creep characteristic. The composite was manufactured using a hand-layup process. The samples were produced by varying the weight ratios of fiber loading (0 %, 0.2 %, 0.4 %, 0.6 % and 0.8 %) and immersed in three different media (KCl (salt media), NaOH (alkali media) and HNO3 (acid media)). The creep samples were tested according to ASTM standards. The results show that chicken feather–reinforced composites immersed in various media have probable applications because of their superior mechanical properties over non-reinforced composites.

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Section: Resultsmentioning

confidence: 99%

Section: Fig 11 Modulus Of Elasticity Vs Time For Polyester Reinforce...mentioning

confidence: 97%

Effect of Immersion Media for Polyester Composite Reinforced with Chicken Feathers on Creep Behavior

Abed¹,

Battawi²,

Khuder³

2022

sv-jme

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“…It's a good term for the first two stages of creep, namely decelerated and equivelocity creep. Visco-elastic materials, like the polyester composites, may be studied using the Burgers model in order to identify their stress or strain relations as well as their time dependencies [10].…”

Section: The Adaptability Of the Viscoelastic Modelmentioning

confidence: 99%

Experimental, theoretical and numerical investigation of creep characteristics of fish scale powder-chicken feather filled polyester composites

Battawi¹,

Abed²

2022

J Appl Eng Science

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Natural fibres would play a significant part in the production of composite materials since these fibres are entirely renewable, environmentally friendly, have a high specific strength, inexpensive, and biodegradable. The objective of this research is to investigate the potential of fish scale powder and chicken feather as reinforcing agents in polyester composites, as well as the composites' creep behaviour. Hand lay-up procedures were used to prepare weight fractions (0.2, 0.5, 0.8, and 1.1%) of chicken feather along with 5% fish scale powder. It is observed that the composite with 0.8% chicken feather and 5% fish scale powder showed encouraging results as it enhanced the creep strain by 74.29% and diminished the stress by 40.71% compared with neat polyester. The experimental, theoretical, and numerical results were compared. Good accuracy has been observed, with a relative error of no more than 3.2%. These findings indicate that natural fibres have enhanced creep properties and might be a feasible alternative to industrial applications.

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“…In many cases, the viscoelastic parameters that are determined geometrically from the creep curve by taking strain rates at t = 0 and t = ∞ lack accuracy. The linear viscoelastic parameter analyses are discussed for different materials (Keenan et al 2013;Ngudiyono et al 2019;Bharadwaj et al 2017). The FE studies by Ngudiyono et al (2019) and Bharadwaj et al (2017) used the Prony series to model the time-dependent shear moduli of the materials.…”

Section: Introductionmentioning

confidence: 99%

“…The linear viscoelastic parameter analyses are discussed for different materials (Keenan et al 2013;Ngudiyono et al 2019;Bharadwaj et al 2017). The FE studies by Ngudiyono et al (2019) and Bharadwaj et al (2017) used the Prony series to model the time-dependent shear moduli of the materials.…”

Section: Introductionmentioning

confidence: 99%

Characterising the linear viscoelastic behaviour of an injection moulding grade polypropylene polymer

Gebrehiwot

Espinosa-Leal

2021

Mech Time-Depend Mater

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The linear viscoelastic behaviour of an injection moulding grade polypropylene is studied using theoretical and computational methods. Polypropylene has a variety of engineering applications as a component. However, it commonly exhibits viscoelastic deformations. This paper analyses the creep and recovery responses of the BJ368MO polypropylene copolymer using the Burgers and generalised Maxwell models. Within the linear viscoelastic regime, an experimental creep strain at $20\ \text{MPa}$ 20 MPa is used to determine the rheological constants of the models. These constants (springs and dashpots) are determined using a nonlinear least-squares curve fitting of the experimental creep. Then they are used to predict the creep and recovery responses of the polymer at three different stresses, $10\ \text{MPa}$ 10 MPa , $12.5\ \text{MPa}$ 12.5 MPa and $15\ \text{MPa}$ 15 MPa . The experiments are made using tensile specimens designed according to the ASTM D638-14standard. The theoretical evaluations are made using the creep and recovery equations derived from their constitutive. Whereas COMSOL Multiphysics software is used during the finite element (FE) analyses. The results of the theoretical and FE calculations are verified using creep and recovery experiments. Based on the validation analyses, both viscoelastic models showed lower deviations from the experimental results when a computational approach is used. In addition, the viscoelastic models are compared by evaluating the residuals of the creep and recovery strain predictions. The theoretical analyses showed better predictions at $12.5\ \text{MPa}$ 12.5 MPa and $15\ \text{MPa}$ 15 MPa stresses when the generalised Maxwell model is used. However, the improvements are attributed to the recovery predictions. When FE is used, the Burgers model showed lower mean absolute percentage errors (MAPEs) in all creep and recovery predictions. The model has a minimum of 6.37% error at the $10\ \text{MPa}$ 10 MPa stress and a maximum of 8.23% error at the $15\ \text{MPa}$ 15 MPa . By comparison, the generalised Maxwell model showed a minimum of 9.24% error at $12.5\ \text{MPa}$ 12.5 MPa and a maximum of 12.8% error at $15\ \text{MPa}$ 15 MPa stresses. The novelty of this paper is on predicting the creep and recovery behaviour of the polymer using the FE and theoretical approaches in the linear viscoelastic regime. The findings suggest that the FE analyses using the Burgers viscoelastic material model provide better predictions, with all calculated errors falling below 10%.

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Modeling Creep Relaxation of Polytetrafluorethylene Gaskets for Finite Element Analysis

Cited by 6 publications

References 9 publications

Effect of Immersion Media for Polyester Composite Reinforced with Chicken Feathers on Creep Behavior

Effect of Immersion Media for Polyester Composite Reinforced with Chicken Feathers on Creep Behavior

Experimental, theoretical and numerical investigation of creep characteristics of fish scale powder-chicken feather filled polyester composites

Characterising the linear viscoelastic behaviour of an injection moulding grade polypropylene polymer

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