An anisotropic viscoelastic-viscoplastic model for short-fiber composites

Amiri-Rad, Ahmad; Pastukhov, Leonid V.; Govaert, Leon Le; Dommelen, J.A.W. van

doi:10.1016/j.mechmat.2019.103141

Cited by 24 publications

(17 citation statements)

References 36 publications

(42 reference statements)

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“…As mentioned before, the constitutive model used in this study is capable of capturing the anisotropic viscoelasticviscoplastic response of SFRTs. A more detailed discussion on the formulation and numerical implementation of this model can be found in Amiri-Rad et al [10] In this section, a more concise description of the model will be presented. In this model two contributions to stress are considered which act in parallel.…”

Section: Constitutive Modelmentioning

confidence: 99%

“…An implicit procedure for the numerical integration of this set of equations is presented in Amiri-Rad et al [10] Also, details on finding the material input parameters for different modes from experimental stress-strain curves can be found in Amiri-Rad et al [10]…”

Section: Constitutive Modelmentioning

confidence: 99%

“…In addition, SFRTs also demonstrate timedependent response. [9,10] As a result, creep deformation of the polymer matrix, ultimately resulting in a steady rate of flow, is always present at any applied stress level. This complex mechanical response of injection-molded components based on SFRTs makes constitutive modeling, characterization, and the model application process, challenging.…”

mentioning

confidence: 99%

“…In this article, a constitutive model developed in our group [10] will be applied to an injection-molded component with a complex geometry and fiber orientation. The objective of this article is to provide effective characterization and model application techniques for injectionmolded products based on SFRT.…”

mentioning

confidence: 99%

“…Most studies on the macro-scale constitutive modeling of composites usually ignore the rate-dependency of the yield behavior. [23][24][25] In this article, a macro-scale model, developed in our group, [10] will be used to model an injection-molded component with a complex geometry. The model captures the anisotropic and viscoelastic mechanical response of the SFRT and provides a powerful description of viscoplasticity and yield kinetics.…”

mentioning

confidence: 99%

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Constitutive modeling of injection‐molded short‐fiber composites: Characterization and model application

Amiri-Rad

Wismans

Pastukhov

et al. 2020

J of Applied Polymer Sci

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A previously developed constitutive model for short‐fiber reinforced thermoplastics is applied to an injection‐molded component with a complex geometry and microstructure. This macro‐scale continuum‐based model is able to capture the anisotropic viscoelastic‐viscoplastic response of the material. In injection‐molded short‐fiber composites, the anisotropic mechanical properties depend strongly on the fiber orientation distribution, which generally displays a marked variation throughout the product. This makes the material characterization and model application challenging. In this article, two characterization and model application strategies are proposed. These techniques, together with the developed constitutive model provide a strong tool for reliable prediction of the mechanical response of an injection molded product, where inputs to the finite element analysis are obtained directly from a numerical simulation of the injection molding process. In this article, from the output provided by an injection molding process simulation software such as Moldflow, the distribution of anisotropic elastic and plastic properties throughout the component is found and the data is imported to the finite element mesh. Mechanical tests are performed on a validation product and results are compared with model predictions from finite element simulations. Through this comparison, the performance of the constitutive model and also proposed procedures for characterization and model application are investigated.

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Section: Constitutive Modelmentioning

confidence: 99%

Section: Constitutive Modelmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Constitutive modeling of injection‐molded short‐fiber composites: Characterization and model application

Amiri-Rad

Wismans

Pastukhov

et al. 2020

J of Applied Polymer Sci

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Time‐dependent failure of off‐axis loaded unidirectional glass/iPP composites

Erartsın

Amiri-Rad

Drongelen

et al. 2022

J of Applied Polymer Sci

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In our previous study, we demonstrated that the time‐dependent failure of transversely loaded UD (unidirectional) glass/iPP is fully plasticity‐controlled and proposed a lifetime prediction method based on plasticity to predict transverse failure. In the present work, extending our previous study to other off‐axis angles, we aim to investigate the effect of the off‐axis angle on the time‐dependent failure of UD glass/iPP, and to propose a lifetime prediction method for the off‐axis failure. Glass/iPP specimens with different off‐axis angles are tested at various strain rates, creep, and fatigue loads to characterize the anisotropic, time‐dependent mechanical response. It is demonstrated that the influences of strain rate and fiber orientation angle on tensile strength are multiplicatively separable; also referred to as factorizable, enabling one to characterize the angle dependence at a single strain rate and the strain rate dependence at a single angle. Moreover, similar to transverse loading, off‐axis failure is also observed to be plasticity‐controlled. Based on these observations, the lifetime prediction method for the plasticity‐controlled transverse failure is extended to off‐axis loading using the aforementioned factorazibility, which resulted in lifetime predictions in agreement with the experimental creep and fatigue data.

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Method of Superimposed Meshes for Solving Nonlinear Dynamic Problems

Martynenko

2021

Advanced Structured Materials

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An anisotropic viscoelastic-viscoplastic model for short-fiber composites

Cited by 24 publications

References 36 publications

Constitutive modeling of injection‐molded short‐fiber composites: Characterization and model application

Constitutive modeling of injection‐molded short‐fiber composites: Characterization and model application

Time‐dependent failure of off‐axis loaded unidirectional glass/iPP composites

Method of Superimposed Meshes for Solving Nonlinear Dynamic Problems

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