Limitations on the computational analysis of creep failure models: A review

Sattar, Mohsin; Othman, Abdul Rahim; Kamaruddin, Shahrul; Akhtar, Maaz; Khan, Rashid

doi:10.1016/j.engfailanal.2021.105968

Cited by 38 publications

(14 citation statements)

References 117 publications

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“…Viscoplastic flow in the crystalline phase is described by the conventional Norton equation (see [ 1 , 4 ] for historical surveys):

with

where

and n are adjustable parameters. Equation ( 38 ) is modified by the introduction of a threshold stress

, below which the viscoplastic flow in spherulites is not observed (the response of the crystalline skeleton in creep tests with

is presumed to be purely elastic).…”

Section: Constitutive Modelmentioning

confidence: 99%

“…Widespread industrial applications of polymers and polymer composites require an adequate description of their mechanical behavior and failure under constant, monotonic, and periodic loadings. The lifetime assessment and predictions of the long-term response of these materials under creep and fatigue conditions have attracted noticeable attention in the past few decades [ 1 , 2 , 3 , 4 ]. These issues are of essential importance for polyethylene pipes, whose failure is driven by the viscoplastic flow and damage accumulation in both the amorphous and crystalline phases [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

2023

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Observations are reported in uniaxial tensile tests with various strain rates, tensile relaxation tests with various strains, and tensile creep tests with various stresses on high-density polyethylene (HDPE) at room temperature. Constitutive equations are developed for the viscoelastoplastic response of semicrystalline polymers. The model involves seven material parameters. Four of them are found by fitting observations in relaxation tests, while the others are determined by matching experimental creep curves. The predictive ability of the model is confirmed by comparing observations in independent short- and medium-term creep tests (with the duration up to several days) with the results of numerical analysis. The governing relations are applied to evaluate the lifetime of HDPE under creep conditions. An advantage of the proposed approach is that it predicts the stress-time-to-failure diagrams with account for the creep endurance limit.

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“…Viscoplastic flow in the crystalline phase is described by the conventional Norton equation (see [ 1 , 4 ] for historical surveys):

with

where

and n are adjustable parameters. Equation ( 38 ) is modified by the introduction of a threshold stress

, below which the viscoplastic flow in spherulites is not observed (the response of the crystalline skeleton in creep tests with

is presumed to be purely elastic).…”

Section: Constitutive Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

2023

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“…For fatigue, the effect of cycle asymmetry is taken into account. At subsequent levels, the regularities are generalized to nonisothermal loading, three-dimensional stress state, anisotropy, bimodularity (Abdul-Latif, 2021;Betten, 2008;Ferreira et al, 2022;Gorash, 2014;Guo et al, 2021;Kachanov, 1986;Krajcinovic, 1996;Lemaitre and Chaboche, 1990;Mattiello and Desmorat, 2021;Meyers and Chawla, 2009;Murakami, 2012;Naumenko and Altenbach, 2016;Rabotnov, 1969;Sattar et al, 2022), etc. At each of these levels, 1) the accumulation of experimental data and 2) the construction of mathematical models adequate to them takes place.…”

Section: Introductionmentioning

confidence: 99%

Theory and methods of constructing equations for the evolutionary damageability of materials

Fedorov

2023

International Journal of Damage Mechanics

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The theory and methods for constructing equations (functions) of evolutionary damage and rupture of materials in the Kachanov model (creep rupture and fatigue rupture) are presented. In general, it is proved that the factorized Kachanov model is identical to the Palmgren-Miner rule, which is often not confirmed experimentally. To construct damageability functions adequate to the experimental data, new mathematical objects (potential and normalized potential) are introduced. If the entire history of changes in the damage variable is known in experiments, then the use of the potential makes it possible to construct a damageability function of any complexity without integrating the evolutionary equation (explicit method). For cases where only rupture moments are recorded in experiments, a criterion for the adequacy of the normalized potential is formulated and an implicit method for its construction is developed. It is supplemented with a recursive algorithm that generates an unlimited number of such potentials. The implicit method is illustrated by examples, following which the reader can construct a damageability equation for his material without a thorough study of the theory.

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“…Therefore, considering only the conventional approach of designing the materials is not appropriate for advanced applications. The inclusion of viscoelastic analysis can give better insight about the life of materials and can precisely predict the performance and failure 7–10 . Depending on the material composition, the creep deformation may be evident at room temperature and accelerates rapidly at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The inclusion of viscoelastic analysis can give better insight about the life of materials and can precisely predict the performance and failure. [7][8][9][10] Depending on the material composition, the creep deformation may be evident at room temperature and accelerates rapidly at elevated temperatures. It has also been found that approximately 22% of all plastic component failures are associated with creep mechanism.…”

mentioning

confidence: 99%

Creep behavior of 3D printed polymer composites

Jayswal,

Liu,

Harris

et al. 2023

Polymer Engineering & Sci

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The creep behavior of polymer composites containing different weight percentages of poly(lactic) acid (PLA), thermoplastic polyurethane (TPU), and poly(ethylene) glycol (PEG) is experimentally characterized and computationally modeled using finite element analysis (FEA). The composite filaments are manufactured with melt extrusion method by using twin‐screw extruders, and then are employed in the 3D printing of creep samples. The samples are tested under a constant tensile load of 100 N. In this study, the computational model is developed by using the Generalized Voigt‐Kelvin solid model and three terms in Prony series. The equations of Prony series were obtained by the Laplace transformation of Kelvin model. The experimental creep displacements and strains are compared with computational results, and a good agreement between them is observed. The maximum error percentage in computational result is approximately 6% as compared to the experimental result. Hence, it can be said that the relatively simple computational models developed are reliable and can be used to study the creep behavior of similar polymers. The error percentages can still be reduced by considering a higher number of terms of Prony series in the model.Highlights Studied creep behavior for additively manufactured thermoplastic polymer composites. Developed computational model using three terms of relaxation modulus. The experimental results correlate very well with the computational model. Computational models can be used for other polymers.

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Limitations on the computational analysis of creep failure models: A review

Cited by 38 publications

References 117 publications

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

Theory and methods of constructing equations for the evolutionary damageability of materials

Creep behavior of 3D printed polymer composites

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