Viscoelastic modelling of creep and stress relaxation behaviour in PLA-PCL fibres

Guedes, Rui Miranda; Singh, Anurag; Pinto, Viviana

doi:10.1007/s12221-017-7479-y

Cited by 13 publications

(12 citation statements)

References 30 publications

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“…Creep is a time‐varying viscoplastic behavior of materials under constant stress, which is of great significance in the structural design of materials 39 . In order to describe the creep deformation of FFF 3D printing polymer materials, the four‐elements Burger model 40 formed by the Maxwell model and Kelvin model in series is adopted in this study. The detail of the Burger model is shown in Figure 6.…”

Section: Theoretical Modelmentioning

confidence: 99%

A modified creep model of polylactic acid (PLA‐max) materials with different printing angles processed by fused filament fabrication

Yao

Deng

et al. 2020

J of Applied Polymer Sci

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The creep behavior caused by the viscous mechanical effect of biodegradable polylactic acid (PLA‐max) material is of great significance to its application. To better understand the creep properties of PLA‐max materials processed by fused filament fabrication, the effects of printing parameters including printing angle and layer thickness on them are studied theoretically and experimentally. The experimental results show that within the range of loading stress and loading time, the creep deformation of the PLA‐max material decreases with the increase of the printing angle or the decrease of the layer thickness. The experimental results are processed and analyzed, and a modified Burger model is proposed to quantitatively analyze the creep deformation of PLA‐max. In this modified Burger model, the four parameters are functions of printing angle and stress level. The modified model can accurately calculate the creep deformation of the specimen at other printing angles, which provides an important reference for the design of functional structures with specific mechanical properties.

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Section: Theoretical Modelmentioning

confidence: 99%

A modified creep model of polylactic acid (PLA‐max) materials with different printing angles processed by fused filament fabrication

Yao

Deng

et al. 2020

J of Applied Polymer Sci

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“…There is little data on stress relaxation of PLA in the literature. Guedes et al [41] report stress relaxation on a PLA-PCL (polycaprolactone) blend at room temperature and at strains up to 0.16, and were able to model the results using linear viscoelasticity. Duscunceli et al [42] have studied stress relaxation of PLA at small strains and up to 50 °C.…”

Section: Resultsmentioning

confidence: 99%

Modelling the Mechanical and Strain Recovery Behaviour of Partially Crystalline PLA

Sweeney¹,

Spencer²,

Nair³

et al. 2019

Polymers

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This is a study of the modelling and prediction of strain recovery in a polylactide. Strain recovery near the glass transition temperature is the underlying mechanism for the shape memory in an amorphous polymer. The investigation is aimed at modelling such shape memory behaviour. A PLA-based copolymer is subjected to stress–strain, stress relaxation and strain recovery experiments at large strain at 60 °C just below its glass transition temperature. The material is 13% crystalline. Using published data on the mechanical properties of the crystals, finite element modelling was used to determine the effect of the crystal phase on the overall mechanical behaviour of the material, which was found to be significant. The finite element models were also used to relate the stress–strain results to the yield stress of the amorphous phase. This yield stress was found to possess strain rate dependence consistent with an Eyring process. Stress relaxation experiments were also interpreted in terms of the Eyring process, and a two-process Eyring-based model was defined that was capable of modelling strain recovery behaviour. This was essentially a model of the amorphous phase. It was shown to be capable of useful predictions of strain recovery.

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“…The mechanism of achieving tightness was touched upon in the works [1] [2] [3]. As the experience of using sealing elements shows, the edge effects and heredity have a significant influence on their sealing ability [10] [11] [12] [13]. Therefore, study of sealing ability of cylindrical sealing elements with regard to edge effects and heredity and development on this basis effective measure to improve their efficiency has both a practical and scientific value.…”

Section: Introductionmentioning

confidence: 99%

Contact Pressure between the Outside Surface of the Sealer and Cylinder Wall

Abbasov¹,

Rustamova²,

Darishova³

2020

JAMP

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Character of contract pressure distribution between the outside surface of the sealing material and rigid cylinder wall depending on geometrical sizes and mechanical properties of a sealer under its unilateral compression, is defined. The magnitude of the axial load for achieving tightness is determined. The dependence between the magnitude of the axial load necessary for achieving tightness and geometrical sizes is determined. It is shown that with a decrease in the height of the sealing element, the axial load necessary for achieving tightness greatly increases. Threshold height of the sealer, above which contact pressure depends little on the magnitude of the axial load, is defined. The stress-strain state of the sealing element is defined with regard to viscous-elastic properties of its material. It is shown that this greatly influences its sealing ability.

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Viscoelastic modelling of creep and stress relaxation behaviour in PLA-PCL fibres

Cited by 13 publications

References 30 publications

A modified creep model of polylactic acid (PLA‐max) materials with different printing angles processed by fused filament fabrication

A modified creep model of polylactic acid (PLA‐max) materials with different printing angles processed by fused filament fabrication

Modelling the Mechanical and Strain Recovery Behaviour of Partially Crystalline PLA

Contact Pressure between the Outside Surface of the Sealer and Cylinder Wall

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