Fatigue modeling of short fiber reinforced composites with ductile matrix under cyclic loading

Kabir, Mohammad Rizviul; Lutz, W.; Zhu, Kun; Schmauder, Siegfried

doi:10.1016/j.commatsci.2005.09.004

Cited by 24 publications

(12 citation statements)

References 5 publications

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“…m w is the shape parameter and controls the brittleness of the material and a d is the scale parameter (Weibull modulus). The Weibull damage model has been applied to model debonding effects in fiber reinforced composites (Kabir et al, 2006;Kim and Lee, 2011;Lee, 2001). Despite the fact that shale can be viewed as a geomaterial with a clay rich matrix and brittle bonds inclusion as a result of diagenetic processes, in the present work the damage model is introduced as purely phenomenological and no connection between microstructure and the damage evolution function is asserted.…”

Section: Coupled Plastic-damage Modelmentioning

confidence: 99%

Constitutive analysis of shale: a coupled damage plasticity approach

Parisio

Samat

Laloui

2015

International Journal of Solids and Structures

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a b s t r a c tShales have become increasingly important because they play key roles in modern energy and environmental geomechanics applications, such as nuclear waste storage, non-conventional oil and gas operations and CO 2 geological storage. Shale behaves in a quasi-brittle manner, often exhibiting linear elasticity before reaching its peak stress. Furthermore, softening of the material leads to a residual state in which pure plastic flow is observed under constant values of deviatoric stress. Degradation of the elastic moduli and the accumulation of irreversible strains are believed to be primarily caused by the debonding and decohesion mechanisms in the structure, as well as the growth of microcracks. To capture these features, a constitutive model that couples elastic, plastic and damage theories is developed. The isotropic damage model is based on the Weibull probabilistic theory and describes the failure of brittle materials. This model is coupled with a modified version of the Lade-Duncan criterion to account for non-linear dependency of shear resistance with a mean stress typical of geomaterials. The two surfaces of damage and plasticity and the rate equations for the internal variables are postulated and thermodynamic consistency is subsequently investigated. The coupled plastic-damage constitutive model is integrated with an implicit stress return algorithm for the plastic part, while the damage part can be integrated implicitly. Numerical back-calculations of experimental results from two quasi-brittle shales demonstrate the ability of the model to reproduce the primary features of their mechanical behavior.

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Section: Coupled Plastic-damage Modelmentioning

confidence: 99%

Constitutive analysis of shale: a coupled damage plasticity approach

Parisio

Samat

Laloui

2015

International Journal of Solids and Structures

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“…Which ratio of fibers are aligned along or transverse to the main direction, is described by means of the eigenvalues of the three-dimensional orientation tensor . (6) Kabir et al [10] have shown that at 0° and 90° load there are two failure mechanisms: fiber fracture and failure of the matrix-fiber composite. At 0° load, there is mainly fiber fracture, whereas at 90° load, the failure is primarily a separation of the fibers from the matrix.…”

Section: -2mentioning

confidence: 99%

Estimation of the lifetime of short fiber-reinforced plastic parts in steering systems

Ferrano¹,

Lipka²,

Stanko³

et al. 2016

AIP Conference Proceedings

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Abstract. The paper presents a strain-based approach for the lifetime calculation of short fiber-reinforced plastics which takes into account the elastoplastic and anisotropic behavior of the material. For this, a coupled process-structure simulation is used. The advantages of the new approach are shown by comparison between a linear elastic and isotropic Finite Element (FE) analysis using conservative estimation of the lifetime [1]. Tests of a steering system component subjected to load cycles are the basis. The material used is a glass fiber-reinforced polyamide 66 (PA66 GF30).

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“…Different from the phenomenological approaches based upon the macroscopic level, the progressive model is needed to consider local damage mechanisms, such as fiber breakage, matrix deformation, interfacial debonding, etc (Kabir et al, 2006) and predict the dominant failure modes. This method seems to be more accurate but computationally complicated because it accounts for many failure mechanisms and is also related to damage accumulation correlated with material properties degradation.…”

Section: Introductionmentioning

confidence: 99%