Analysis of a delayed fracture criterion for lifetime prediction of viscoelastic polymer materials

Guedes, Rui Miranda

doi:10.1007/s11043-011-9163-8

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…The material is loaded at 10 days. The strength of fiber is set at σ M T c 4GPa so that the estimated instantaneous tensile strength is close to the one measured by Guedes et al[14]. The Zhurkov model of creep failure[103] is a straight line t/τ = e U −γσ adjusted by Guedes et al on their experimental data (τ =3600s, U=38.1MPa,γ = 0.24.…”

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confidence: 91%

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Estimation of creep strain and creep failure of a glass reinforced plastic by semi-analytical methods and 3D numerical simulations

Lavergne

Sab

Sanahuja

et al. 2015

Mechanics of Materials

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International audienceGlass reinforced plastics based on polyvinyl chloride (PVC) is a material of choice for construction applications, such as pipes. The lifetime of pipes may be limited by creep failure and polymers exhibit a viscoelastic response that depends on the time of loading. In this paper, homogenization methods are designed to upscale the viscoelastic properties of a composite material made of chopped glass fibers with random orientations and PVC. The estimates of the Mori–Tanaka scheme and 3D numerical computations for creep strains and creep failure are compared, validating the Mori–Tanaka model as a practical tool to predict the effect of fiber length and volume fraction of fibers on creep strain and creep failure. In particular, it appears that, for a given creep load, the lifetime of the material is increased if the volume fraction of fibers increases or if the length of fibers decreases, as long as the failure mode is fiber breakage

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confidence: 91%

“…The time-to-failure is expected to depend on the pressure level, following a power law. Hence, studying the viscoelastic behavior of glass reinforced plastics is required to adjust delayed fracture criterion [14] and estimate the lifetime and durability of such pipes.…”

Section: Introductionmentioning

confidence: 99%

Estimation of creep strain and creep failure of a glass reinforced plastic by semi-analytical methods and 3D numerical simulations

Lavergne

Sab

Sanahuja

et al. 2015

Mechanics of Materials

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show abstract

“…Particularly, their long‐term dimensional stability and strength, as well as the time‐temperature dependence of their mechanical properties, which is related to the knowledge of the viscoelastic material functions, is always an issue of great importance. [ 1‐6 ] The viscoelastic behavior of polymers can be measured and analyzed in several distinctive but interrelated ways. The most common measurements used for characterizing the linear time‐dependent mechanical response are forced oscillation measurements, as a function of frequency, and stress relaxation and creep measurements as functions of time.…”

Section: Introductionmentioning

confidence: 99%

The effectiveness of interconversion methods based on the distributed nature of polymeric structure

Katsourinis

Kontou

2021

Polymer Engineering & Sci

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In the present work, a comparative study on the capability of two approaches to successfully interconvert linear viscoelastic functions is performed. The main concept arises from our previous works, where a polymeric material is treated as a collection of meso‐regions, each one of them with a specific energy barrier. The linking between meso‐regions and their rearrangements leads to a time‐dependent constitutive equation. A crucial issue is the distribution of the energy barriers of the meso‐regions, revealing the importance of the distributed nature of the polymeric structure. In this work, the effect of the distribution type was examined by assuming either a Gaussian distribution function or a normalized loss modulus distribution, which can be evaluated from the loss modulus experimental data. Four different polymers were examined and it was proved that both treatments can satisfactorily predict the creep and relaxation function, once the model parameters are evaluated on the basis of dynamic moduli experimental data.

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“…The extended application of polymers and polymer matrix composites as engineering materials in aerospace, automotive industry, and civil engineering structures demands for their correct characterization with regard to the time‐dependent properties, that is, long‐term dimensional stability and strength, as a consequence of the viscoelasticity of the polymeric matrix .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of fundamental viscoelastic functions by a nonlinear viscoelastic model

Spathis

Katsourinis

Kontou

2017

Polymer Engineering & Sci

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In this work, a new constitutive equation for the description of the nonlinear viscoelastic response of polymeric materials is presented, by proposing modifications on a model developed in previous works. This time-dependent equation has been derived on the basis of transient model, and a new assumption regarding the kinetics of active molecular chains due to the imposed deformation. The present treatment was proved to be more flexible, given that it contains a relaxation function that has been derived by considering, instead of first-order kinetics, a fractional derivative that controls the rate of molecular chain detachment from their junctions. It has been further explored that the potential of this equation to be employed for the evaluation of the dynamic modulus master curve, once the experimental data of the compliance modulus of a polymeric structure have been matched.

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Analysis of a delayed fracture criterion for lifetime prediction of viscoelastic polymer materials

Cited by 8 publications

References 8 publications

Estimation of creep strain and creep failure of a glass reinforced plastic by semi-analytical methods and 3D numerical simulations

Estimation of creep strain and creep failure of a glass reinforced plastic by semi-analytical methods and 3D numerical simulations

The effectiveness of interconversion methods based on the distributed nature of polymeric structure

Evaluation of fundamental viscoelastic functions by a nonlinear viscoelastic model

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