Viscoelasticity and the Small Punch Creep Recovery Test: Numerical analysis and experimental tests on the applicability for polyvinyl chloride (PVC)

Calaf-Chica, José; Díez, Pedro Miguel Bravo; Calzada, Mónica Preciado

doi:10.1016/j.mechmat.2021.104016

Cited by 5 publications

(10 citation statements)

References 34 publications

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“…The sense of this investigation, as mentioned in the previous section, was to extend the experimental SPCRTs performed in previous research [ 26 ] to other polymers due to two main reasons: (i) the experimental tests are today limited to PVC, and (ii) PVC showed in that experiments a significant change in their viscoelastic properties when the CCRT was performed with a creep load near the plateau stress. This non-linear behavior affected the SPCRT estimation, obtaining higher viscoelastic properties in comparison with the CCRT estimation.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Finally, polytetrafluoroethylene (PTFE) was selected as a thermoplastic with a significant non-linear viscoelastic behavior. This last material was selected in order to show if the SPCRT estimation for non-linear viscoelastic polymers provided similar results to the predicted ones for the non-linear viscoelastic behavior of PVC in the investigation performed in [ 26 ].…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Depending on the testing set-up, the creep load can be in tensile, compressive, bending, or shearing modes, as can also be selected in the standard ISO 6721 [ 25 ] for the determination of dynamic mechanical properties of plastics. In 2021, Calaf-Chica et al [ 26 ] developed the Small Punch Creep-Recovery Test (SPCRT), as a derived miniature test from the SPT, for the estimation of viscoelastic properties of polymers and biomaterials. The stress field in the SPT specimen is a complex scenario of a combination of plate bending and indentation loadings.…”

Section: Introductionmentioning

confidence: 99%

“…This means that the SPCRT should be only applied for polymers or biomaterials with a linear viscoelastic behavior, independent of creep stress level. The experimental validation with PVC performed by Calaf-Chica et al [ 26 ] included compressive creep-recovery tests (CCRT) with different creep loads and SPCRTs. CCRTs showed that the established creep load influenced on the estimated Prony components.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of the current investigation was to extend the experimental tests to other polymers, and deepen the influence of non-linear viscoelastic behavior in the estimation capabilities of the SPCRT. In that sense, and based on the conclusions and future work derived from [ 26 ], the SPCRT could be a good testing methodology in order to estimate the viscoelastic properties derived from CCRTs with creep loads near the yield strength, and being equivalent to viscoelastic properties derived from large-amplitude dynamic creep testing. This investigation also evaluated the influence of the viscoelastic recovery produced during the unloading step of CCRTs and SPCRTs.…”

Section: Introductionmentioning

confidence: 99%

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Application of the Small Punch Creep-Recovery Test (SPCRT) for the Estimation of Large-Amplitude Viscoelastic Properties of Polymers

et al. 2023

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The Small Punch Creep-Recovery Test (SPCRT) is a novel miniature test used to estimate the viscoelastic properties of polymers and biomaterials. The current investigation related to the SPCRT is limited to Finite Element Method (FEM) simulations and experimental tests on PVC. The aim of this investigation was focused on: (i) extending the experimental tests to other polymers with dissimilar viscoelastic properties; (ii) deepening the influence of non-linear viscoelastic properties in the estimation capabilities of the SPCRT; and (iii) developing a numerical methodology to estimate and take into account the viscoelastic recovery produced during the unloading step of compressive creep-recovery tests (CCRT) and SPCRTs. The experimental tests (CCRTs and SPCRTs) were done on polyethylene PE 500, polyoxymethylene POM C, nylon PA 6, and polytetrafluoroethylene (PTFE), with a range of creep loads, in the case of CCRTs, in the whole elastic regime and the surroundings of the yield strength of each material. The experimental results confirmed that the SPCRT was an accurate and reliable testing method for linear viscoelastic polymers. For a non-linear viscoelastic behavior, SPCRT estimated the viscoelastic properties obtained from CCRTs for creep loads near the yield strength of the polymer, which corresponded with large-amplitude viscoelastic properties in dynamic creep testing. In order to consider the viscoelastic recovery generated in the unloading step of CCRTs and SPCRTs, a Maxwell-Wiechert model with two branches was used, simulating the different steps of the experimental tests, and solving numerically the differential equation of the Maxwell-Wiechert model with the Runge-Kutta-Fehlberg (RKF) numerical method. The coefficients of the elements of the Maxwell-Wiechert model were estimated approaching the straining curve of the recovery step of the simulation with the same curve registered on each experimental test. Experimental CCRTs with different unloading times demonstrated that the use of this procedure derived in no influence of the unloading step time in the viscoelastic properties estimation.

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Section: Materials and Methodsmentioning

confidence: 99%

Section: Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application of the Small Punch Creep-Recovery Test (SPCRT) for the Estimation of Large-Amplitude Viscoelastic Properties of Polymers

et al. 2023

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Analysis of the variable‐order fractional viscoelastic modeling with application to polymer materials

Han

Yin

Gao

2023

Polymers for Advanced Techs

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The variable-order fractional (VOF) operator has been extensively employed to depict complex physical phenomena of viscoelastic materials, during which the reasonable form of the proper variable-order (VO) function will significantly affect the applicability and accuracy of proposed fractional model. To this regard, this work aims to provide a technical guidance for VO function selection in VOF viscoelastic modeling. In this paper, we develop a VOF model based on the classical Zener model, the suitable VO function form and the applicability of VOF model are investigated by means of characterizing the stress relaxation and creep recovery behaviors, in which the monotonicity of VO functions (decreasing or increasing) are discussed in detail.The results demonstrate that the stress relaxation and creep recovery responses have a realistic physical meaning only when the VOF rheological model with a monotonically decreasing VO function. Furthermore, three definitions of VOFD are also considered to determine the optimal VO function form and the reasonability of the proposed model is validated by fitting the experimental data of polymer matric materials. The analysis found that the decreasing exponential VO function exhibits good prospects in describing the time-dependent behaviors, and it was found that the V2 and V3 definition types performed better. The results also show that the proposed model has unique advantage compared to the other existing viscoelastic models.Finally, the proposed VOF model is employed to predict the viscoelastic behavior to test the model's predictive ability.

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Modeling creep and creep recovery of 332 aluminum alloy using fractional calculus

Wang

Huang

2021

Mech Time-Depend Mater

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Viscoelasticity and the Small Punch Creep Recovery Test: Numerical analysis and experimental tests on the applicability for polyvinyl chloride (PVC)

Cited by 5 publications

References 34 publications

Application of the Small Punch Creep-Recovery Test (SPCRT) for the Estimation of Large-Amplitude Viscoelastic Properties of Polymers

Application of the Small Punch Creep-Recovery Test (SPCRT) for the Estimation of Large-Amplitude Viscoelastic Properties of Polymers

Analysis of the variable‐order fractional viscoelastic modeling with application to polymer materials

Modeling creep and creep recovery of 332 aluminum alloy using fractional calculus

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