An analytical model to predict the creep behaviour of linear low-density polyethylene (LLDPE) and polypropylene (PP) used in rotational moulding

N, Pozhil S; Menon, Narayanan M.; Waigaonkar, Sachin; Chaudhari, Vikas

doi:10.1016/j.matpr.2019.12.318

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…From the Figure it is evident that the maximum stress is generated at the base of the tank and the minimum stress is generated at the top of the tank where the hydrostatic pressure is zero. It is also seen from the analysis that the equivalent stress of PP is more than HDPE at the same applied hydrostatic pressure (Pozhil et al, 2020).…”

Section: Equivalent (Von-misses) Stressmentioning

confidence: 78%

“…Creep rupture which is the crack formation which acts as a function of time when the product subjected to continuous stress. Therefore, the conventional experimentation method may not be feasible to study for long term creep behavior due to limited time for product development and hence simulation of creep analysis of the product is needed to determine the creep behavior after a long period of time are required to know the product conditions (Pozhil et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Creep analysis of Water tank made of Polypropylene (PP) and High-Density Polyethylene (HDPE) polymer material using ANSYS Simulation

Vijay

Jayapalan²

2022

JER is an international, peer-reviewed journal that publishes f

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The present study investigates the creep behavior of water tank manufactured from Polypropylene (PP) and High-Density Polyethylene (HDPE) polymeric material at 40 °C using ANSYS simulation software. Creep fracture is one of the major industrial problems for a product used for a long period of time. The creep analysis using simulation software is one of the ways to predict the life and durability of a plastic product with low cost and may help in optimizing its design. The PP and HDPE manufactured water tanks were commonly used for storing water in household and industrial applications. In this paper, a water tank were designed using an academic 3-Dimensional SOLIDWORKS software and ANSYS WORKBENCH were used for analyzing the creep strain for the developed CAD model. The CAD modelled water tank was tetrahedron meshed and simulated using static structural analysis and varying hydrostatic pressure were applied on the inner walls of the tank. The base of the tank was constrained to fixed. The analytical model based on modified time hardening creep model were implemented to analyze the creep strain. From the simulation, equivalent (Von-Misses) Stress, equivalent creep strain and total deformation were observed for the developed model. The obtained Creep strain-time graph were used to analyze the creep strain of PP and HDPE materials over a long period of time. From the simulation, it is observed that the material PP is more creep resistant than HDPE as equivalent stress of PP is more than HDPE at the applied hydrostatic pressure and the deformation for PP material were less compared to HDPE. The simulated limiting creep strain of PP as well as HDPE was in good agreement with the comparison of maximum limiting creep strain calculated from the material database.

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Section: Equivalent (Von-misses) Stressmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Creep analysis of Water tank made of Polypropylene (PP) and High-Density Polyethylene (HDPE) polymer material using ANSYS Simulation

Vijay

Jayapalan²

2022

JER is an international, peer-reviewed journal that publishes f

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“…Only the works of Chandran and Waigonkar [25,27] and Pozhil et al [28] expound on this. In [25,27] it is reported that the nature of the dispersed phase has a massive influence on the creep properties with an analytical model for the creep deformation shown in [28].…”

Section: Composite Systemmentioning

confidence: 99%

Mechanical, viscoelastic and gas transport behaviour of rotationally molded polyethylene composites with hard- and soft-wood natural fibres

2022

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Rotomolded uncompatibilized composites of LLDPE with softwood and hardwood flour dispersed phases are compared and contrasted with respect to their static (tensile, flexural and impact) and dynamic (creep modelling, storage and loss moduli) mechanical properties and transport (oxygen permeability). The static and dynamic mechanical properties are analysed as a function of dispersed phase weight fraction and pre and post ethanol sorption. Vital structural properties such as the equilibrium modulus, Kelvin Voigt modulus, Kelvin Voigt viscosity and relaxation times along with creep compliance trends are analysed. The interfacial porosity generated is then correlated to the overall gas transport using oxygen as the probe molecule. Two models are compared and it is found that the model of Alter which uses overall density as the modelling parameter, is able to predict composite gas permeability with high accuracy. Overall, owing to the uncompatibilized nature, most mechanical properties reduce with wood flour incorporation independent of the type of dispersed phase. However, these properties remain consistent pre and post ethanol sorption as long as the dispersed phase weight fraction is around 5%. This indicates that with some external scaffolding type support structures, the rotomolded composites have potential for use as storage units for liquid materials. Graphical abstract

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Polyamide 6‐based thermoplastic vulcanizate for thermostability: An experimental and theoretical investigation

Jiang

2021

J of Applied Polymer Sci

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In engineering cases, nonuniform temperature and pressure loads will cause greater thermal stress and deformation of the structure. The creep of materials will also accelerate with the increase of temperature, which greatly reduces the service life of parts. This study improves the vulcanization effect and twophase compatibility of polyamide 6-based thermoplastic vulcanizates (TPV), and the elastic modulus of the material was increased to resist deformation and creep. The compatibility and mechanical properties of the materials were analyzed by dynamic thermodynamic analysis. The temperature and stress of charge air pipe are numerically calculated by fluid-thermal-solid coupling. The results show that at 120 C, the strain of TPV is less than 3%, and no plastic deformation occurs. Based on the principle of time-temperature superposition, the long-term creep behavior at reference temperature is predicted by stepped isothermal method through short-term temperature rise creep experiment. The creep strain after 10 5 h at 60 C of TPV grafted by maleic anhydride (TPV-g-MAH) is only 2.8%, indicating that it has good durability in the application of charge air pipes.

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An analytical model to predict the creep behaviour of linear low-density polyethylene (LLDPE) and polypropylene (PP) used in rotational moulding

Cited by 5 publications

References 7 publications

Creep analysis of Water tank made of Polypropylene (PP) and High-Density Polyethylene (HDPE) polymer material using ANSYS Simulation

Creep analysis of Water tank made of Polypropylene (PP) and High-Density Polyethylene (HDPE) polymer material using ANSYS Simulation

Mechanical, viscoelastic and gas transport behaviour of rotationally molded polyethylene composites with hard- and soft-wood natural fibres

Polyamide 6‐based thermoplastic vulcanizate for thermostability: An experimental and theoretical investigation

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