Stress-relaxation behavior of lignocellulosic high-density polyethylene composites

Mirzaei, Babak; Tajvidi, Mehdi; Falk, Robert H.; Felton, Colin

doi:10.1177/0731684411411337

Cited by 19 publications

(17 citation statements)

References 12 publications

(21 reference statements)

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“…Geethamma et al found that short coir fibers reduced the stress relaxation rate of rubber and this was attributed to fibers constraining the polymeric chains thereby preventing relaxation [ 16 ]. Mirzaei et al investigated the effect of adding various types of natural fibers in high-density polyethylene and drew similar conclusions [ 17 ].…”

Section: Introductionmentioning

confidence: 86%

Understanding the Stress Relaxation Behavior of Polymers Reinforced with Short Elastic Fibers

2017

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Although it has been experimentally shown that the addition of short-fibers slows the stress relaxation process in composites, the underlying phenomenon is complex and not well understood. Previous studies have proposed that fibers slow the relaxation process by either hindering the movement of nearby polymeric chains or by creating additional covalent bonds at the fiber-matrix interface that must be broken before bulk relaxation can occur. In this study, we propose a simplified analytical model that explicitly accounts for the influence of polymer viscoelasticity on shear stress transfer to the fibers. This model adequately explains the effect of fiber addition on the relaxation behavior without the need to postulate structural changes at the fiber-matrix interface. The model predictions were compared to those from Monte Carlo finite-element simulations, and good agreement between the two was observed.

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Section: Introductionmentioning

confidence: 86%

Understanding the Stress Relaxation Behavior of Polymers Reinforced with Short Elastic Fibers

2017

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“…Factors such as time and temperature have a significant effect on the viscoelastic properties of the polymeric matrix which determines the mechanical behavior of composites (Rowel et al, 2001;Nwosu-Obieogu et al, 2016). Creep analysis of composites is very essential in the study of its deformation rate prior to application, it determines the ability of the composite to withstand highest possible operating load at elevated temperature, resistance to high temperature corrosion and avoidance of material failure, these findings have ensured the reliability and durability of composites in buildings and bridge construction (Mirzaei et al, 2011;Monticelli et al, 2019;Qi et al, 2018;Sreekala et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Creep and Stress Relaxation Behaviour of Rice Husk Reinforced Low Density Polyethylene Composites

Nwosu‐Obieogu

Aguele

Chiemenam

et al. 2020

EUR J SUSTAIN DEV RE

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The creep and stress relaxation behavior of rice husk reinforced low density polyethylene composite was analyzed in this study. The exponential and power model were used to study the creep while the stress relaxation assessed the time required for the composites to maintain a certain strain level. The creep strain increased with increase in time, at various temperatures, with its highest creep at 70 o C while the lowest is at 30 o C, the power model provided an excellent fit than other models with a coefficient of determination of 0.9977 at 30 o C, the neat low density polyethylene had a good stress relaxation behavior with 4.95 seconds for it to decay and subsequently decreased with increase in filler concentration.

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“…Due to these additional bonds, the stress relaxation rates are expected to be slower. George et al [ 6 ], and later Geethamma et al [ 7 ] and Mirzaei et al [ 8 ], have all suggested this mechanism.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Predicting the Stress Relaxation of Composites with Short and Randomly Oriented Fibers

2017

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The addition of short fibers has been experimentally observed to slow the stress relaxation of viscoelastic polymers, producing a change in the relaxation time constant. Our recent study attributed this effect of fibers on stress relaxation behavior to the interfacial shear stress transfer at the fiber-matrix interface. This model explained the effect of fiber addition on stress relaxation without the need to postulate structural changes at the interface. In our previous study, we developed an analytical model for the effect of fully aligned short fibers, and the model predictions were successfully compared to finite element simulations. However, in most industrial applications of short-fiber composites, fibers are not aligned, and hence it is necessary to examine the time dependence of viscoelastic polymers containing randomly oriented short fibers. In this study, we propose an analytical model to predict the stress relaxation behavior of short-fiber composites where the fibers are randomly oriented. The model predictions were compared to results obtained from Monte Carlo finite element simulations, and good agreement between the two was observed. The analytical model provides an excellent tool to accurately predict the stress relaxation behavior of randomly oriented short-fiber composites.

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Stress-relaxation behavior of lignocellulosic high-density polyethylene composites

Cited by 19 publications

References 12 publications

Understanding the Stress Relaxation Behavior of Polymers Reinforced with Short Elastic Fibers

Understanding the Stress Relaxation Behavior of Polymers Reinforced with Short Elastic Fibers

Creep and Stress Relaxation Behaviour of Rice Husk Reinforced Low Density Polyethylene Composites

Modeling and Predicting the Stress Relaxation of Composites with Short and Randomly Oriented Fibers

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