Two Hybrid Approaches to Fatigue Modeling of Advanced-Sheet Molding Compounds (A-SMC) Composite

Ayari, Houssem; Fitoussi, Joseph; Imaddahen, A.; Tamboura, Sahbi; Shirinbayan, Mohammadali; Dali, H. Ben; Tcharkhtchi, Abbas

doi:10.1007/s10443-019-09793-3

Cited by 6 publications

(4 citation statements)

References 36 publications

(39 reference statements)

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“…The last stage is characterized by a drastic decline in stiffness due to rapid crack propagation leading to failure. The Analysis of the stiffness reduction during loading-unloading monotonic tests is used by several authors [7][8][9] to evaluate the macroscopic damage evolutions of SFRC. During the fatigue test, the dynamic modulus (slope of the stress-strain hysteresis) is commonly used as a damage indicator.…”

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confidence: 99%

Multi‐scale analysis of short glass fiber‐reinforced polypropylene under monotonic and fatigue loading

et al. 2020

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Short fiber-reinforced polypropylene is largely used in the automotive industry. Fatigue failure is one of the most failure modes observed in this class of materials. In order to better understand the damage mechanisms and plasticity evolution, this article provides an overall experimental investigation of the mechanical properties of a PPGF40 composite (polypropylene matrix reinforced by a 40% weight content of short glass fibers) including monotonic and cyclic loading. The effect of various parameters such as the loading direction, the strain rate, the temperature, and the fatigue are analyzed. The evolutions of the loss of stiffness and plastic strain during monotonic and fatigue tests are analyzed. Self-heating during cyclic loading is also studied. Moreover, the coupling effect of damage and plasticity is analyzed by plotting the evolution of the relative loss of stiffness vs the plastic strain increment for monotonic and cyclic loadings. For quasi-static loading, the results emphasize an intrinsic curve independent of the loading direction. Moreover, a sharp increase in the damage and plasticity levels due to the local effect occurring during cyclic loading is observed and correlated to SEM fracture surface analysis.

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confidence: 99%

Multi‐scale analysis of short glass fiber‐reinforced polypropylene under monotonic and fatigue loading

et al. 2020

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“…The micromechanical multi-scale modeling is based on the Mori and Tanaka approach [15]. Several authors, such as Fitoussi et al [18,25,26], and Jendli et al [23], have proposed to introduce damage into this approach through the identification of local damage criteria. Indeed, basic equations allow computing composite stiffness and average stress fields in different phases.…”

Section: Basic Equationsmentioning

confidence: 99%

Experimental and numerical multi-scale approach for Sheet-Molding-Compound composites fatigue prediction based on fiber-matrix interface cyclic damage

Tamboura

Ayari

Shirinbayan

et al. 2020

International Journal of Fatigue

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In this paper, a multi-scale approach is proposed to predict the stiffness reduction of a Sheet-Molding-Compound (SMC) composite submitted to low cycle fatigue (until 2.10 5 cycles). Strain-controlled tensile fatigue tests (R = 0.1) are carried out at various strain ranges. Damage is investigated at both macroscopic and microscopic scales through the evolutions of Young's modulus and SEM observations, after interrupted fatigue tests at different lifetime periods. The results show that the fatigue degradation of the composite is mainly controlled by fiber-matrix interface debonding. A quantitative analysis allows determining the threshold and kinetics of the fiber-matrix interface damage during cyclic loading as a function of the orientation of fibers. Moreover, a fibermatrix interface damage criterion, taking into account the local cyclic normal and shear stresses at the interface, is introduced in the Mori and Tanaka approach in order to predict the loss of stiffness. The parameters of this local criterion are identified by reverse engineering on the basis of the experimental results described above. Finally, the predicted loss of stiffness is very consistent with the experimental results.

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“…Few-models, for example, are physically motivated and take the microscale into account, but they are still efficiently applicable to calculations of structural components (e.g., parts that are of interest to the industry [45][46][47][48]). Our model is based on a quadratic interfacial criterion [14,19,49] expressed in terms of normal and shear local stresses at the fiber-matrix interface associated to their corresponding failure values. In order to reflect the effect of the strain rate loading at a fiber-matrix interface scale, the local normal and shear failure stresses should progressively increase.…”

Section: Micromechanical Modeling Of Damage At Fiber-matrix Interfacementioning

confidence: 99%

“…As a consequence, we can consider that the local stresses of the interface-interphase (σ and τ) undergone with a time increment Δt by the interface zone can modify the limiting stresses (σ 0 , τ 0 ) (Eqs. 11 and 12) due to two local phenomena: & The decohesion of the interface mainly sensitive to the strain rate [48][49][50][51] & The redistribution of local stresses due to diffuse damage on other interfacial sites…”

Section: Micromechanical Modeling Of Damage At Fiber-matrix Interfacementioning

confidence: 99%

Micromechanical Modelling of Dynamic Behavior of Advanced Sheet Molding Compound (A-SMC) Composite

et al. 2020

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Passive safety, particularly in the transport industry, requires maximizing the dissipation of energy and minimizing the decelerations undergone by a vehicle following a violent impact (crash). This paper proposes a strategy for identifying an anisotropic local damage criterion in a moderate dynamic loading for Advanced Sheet Molding Compound (A-SMC) composite materials. Multi-scale damage modelling based on the Mori-Tanaka approach is put forward. Previously, the results of an experimental campaign carried out on a range of strain rates varying from quasi static to 200 s −1 were used to identify a probabilistic local damage criterion based on Weibull's formulation and integrate the effect of damage at a fiber-matrix interface scale. Therefore, the progressive local damage occurring under a fast loading may be described. A two-step homogenization procedure allows describing the strain rate effect on the stress-strain curves. The model gives also rise to the prediction of the progressive anisotropic loss of stiffness. Comparing between the experimental and numerical results confirms the ability of the proposed approach to describe the visco-damage effect (delay of damage threshold and decrease in damage kinetics) emphasized in A-SMC composites.

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Two Hybrid Approaches to Fatigue Modeling of Advanced-Sheet Molding Compounds (A-SMC) Composite

Cited by 6 publications

References 36 publications

Multi‐scale analysis of short glass fiber‐reinforced polypropylene under monotonic and fatigue loading

Multi‐scale analysis of short glass fiber‐reinforced polypropylene under monotonic and fatigue loading

Experimental and numerical multi-scale approach for Sheet-Molding-Compound composites fatigue prediction based on fiber-matrix interface cyclic damage

Micromechanical Modelling of Dynamic Behavior of Advanced Sheet Molding Compound (A-SMC) Composite

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