Characterization and modeling of the creep behavior of fiber composites with tension and compression asymmetry

Lv, Jiaxin; Xiao, Yi; Zhou, Yufen; Xie, Yuanhong

doi:10.1016/j.ijmecsci.2019.105340

Cited by 18 publications

(3 citation statements)

References 26 publications

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“…Zhao et al 29 found that doubling stress does not result in doubling creep strain in the study of polymer creep, that is, the creep behavior is nonlinear. Lv et al 30 found that the nonlinear deformation behavior of composites is related to the loading time and fiber direction, which does not conform to the Boltzmann superposition principle. Almeida et al 31 found that creep resistance of composites is directly related to viscoelastic strain and fiber/matrix interfacial behavior.…”

Section: Introductionmentioning

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: Introductionmentioning

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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show abstract

“…Furthermore, certain special engineering materials such as surrounding rocks from underground, asphalt, and concrete exhibit time-independent stress-strain relationships under normal pressure or temperature conditions. [2][3][4] However, as pressure or temperature increases to a certain extent, noticeable viscoelastic characteristics may emerge. Therefore, researching viscoelastic materials' stress performance and analysis methods 5 holds significant scientific and engineering importance.…”

Section: Materials Exhibiting Viscoelastic Mechanical Properties Have...mentioning

confidence: 99%

Initial stress approach-based finite element analysis for viscoelastic materials under generalized Maxwell model

Wang,

Qiang

et al. 2024

AIP Advances

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This paper introduces a conceptual framework for finite element analysis of generalized Maxwell viscoelastic materials based on the initial stress approach. The proposed method facilitates the explicit and convenient determination of mechanical parameters for viscoelastic materials by directly utilizing relaxation test data. Each time step’s viscoelastic relaxation stress is treated as the initial stress, and a recursive calculation formula for the material’s initial stress is established, relying solely on the relaxation stress and strain from the previous time step. Based on this, the study outlines the computational steps for initial-stress-based finite element analysis of elastic materials. The proposed algorithm’s accuracy and efficiency are validated through a classical one-dimensional axial rod example. Results demonstrate that the introduced initial stress-type finite element analysis maintains the stiffness matrix equal to the initial stiffness matrix throughout the calculation process, significantly enhancing the efficiency of finite element analysis for viscoelastic materials while reducing the computational resource required. The conceptual framework improves the efficiency and accuracy of analyzing the mechanical parameters of viscoelastic materials using relaxation test data.

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“…Note that the expression given by Eq. (20) has been discussed recently in [134], however, without referencing sources [117][118][119]. In a particular case of the transverse isotropy of white matter with a single axis of symmetry 1 the following equalities in Eqs.…”

Section: Fig 12 Stiffening Of Meningioma As Measured By Mre : Ct Immentioning

confidence: 99%

Neuromechanical characterization of brain damage in response to head impact and pathological changes

Zolochevsky¹,

Мартыненко

2020

The Journal of v. N. Karazin Kharkiv National University, Series "Medicine"

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Traumatic injuries to the central nervous system (brain and spinal cord) have received special attention because of their devastating socio-economical cost. Functional and morphological damage of brain is the most intricate phenomenon in the body. It is the major cause of disability and death. The paper involves constitutive modeling and computational investigations towards an understanding the mechanical and functional failure of brain due to the traumatic (head impact) and pathological (brain tumor) events within the framework of continuum damage mechanics of brain. Development of brain damage has been analyzed at the organ scale with the whole brain, tissue scale with white and gray tissue, and cellular scale with an individual neuron. The mechanisms of neurodamage growth have been specified in response to head impact and brain tumor. Swelling due to electrical activity of nervous cells under electrophysiological impairments, and elastoplastic deformation and creep under mechanical loading of the brain have been analyzed. The constitutive laws of neuromechanical behavior at large strains have been developed, and tension-compression asymmetry, as well as, initial anisotropy of brain tissue was taken into account. Implementation details of the integrated neuromechanical constitutive model including the Hodgkin-Huxley model for voltage into ABAQUS, ANSYS and in-house developed software have been considered in a form of the computer-based structural modeling tools for analyzing stress distributions over time in healthy and diseased brains, for neurodamage analysis and for lifetime predictions of diseased brains. The outcome of this analysis will be how the neuromechanical simulations applied to the head impact and brain tumor therapies may assist medical specialists with their decisions during planning and application of medical surgeries.

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Characterization and modeling of the creep behavior of fiber composites with tension and compression asymmetry

Cited by 18 publications

References 26 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

Initial stress approach-based finite element analysis for viscoelastic materials under generalized Maxwell model

Neuromechanical characterization of brain damage in response to head impact and pathological changes

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