Macro-mechanical modeling and experimental validation of anisotropic, pressure- and temperature-dependent behavior of short fiber composites

Dean, Aamir; Grbic, Nenad; Rolfes, Raimund; Behrens, Bernd Arno

doi:10.1016/j.compstruct.2018.12.045

Cited by 31 publications

(10 citation statements)

References 40 publications

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“…In a next step, the sophisticated models developed in refs. [40,41] will be employed to numerically investigate the failure behavior of the studied materials.…”

mentioning

confidence: 99%

The Effect of Filler Content on the Tensile Behavior of Polypropylene/Cotton Fiber and poly(vinyl chloride)/Cotton Fiber Composites

Mahdi

Dean

2020

Materials

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This paper investigates the effect of filler content on the mechanical properties of cotton fiber (CF) on the CF/PP and CF/PVC composites under quasi-static loading. For this purpose, experimental tensile tests were carried out on dog-bone specimens, cut out from hot and cold press molded square plates of different fiber weight contents. The results obtained show that the filler content appears to have a strong influence on mechanical energy absorption, and failure characteristics. It was also found that the stiffness for both sets of material increases with the addition of filler. On the other hand, the ductility for both sets of the material increases with the addition of filler. The microscopic morphology study indicates that CF/PP possesses a glossy surface appearance compared to CF/PVC, which possesses a porous surface. Micro-scale damage characteristics from tensile tests indicate that material experienced shear failure, matrix cracking, fiber breakage, fiber fracture, and fiber pullout. The phenomenon of matrix crazing experienced by CF/PP composites was also observed.

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“…In a next step, the sophisticated models developed in refs. [40,41] will be employed to numerically investigate the failure behavior of the studied materials.…”

mentioning

confidence: 99%

The Effect of Filler Content on the Tensile Behavior of Polypropylene/Cotton Fiber and poly(vinyl chloride)/Cotton Fiber Composites

Mahdi

Dean

2020

Materials

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“…Therefore, a smaller influence is expected than for the investigated 2 mm thick plate. In addition, the layer structure is influenced by the fiber content, as shown in [45] for a long fiber reinforced PP and PA6 and in [46] for a short fiber reinforced polyamide with fiber contents of 30% and 60%. In general, the formation of the layer structure is determined by a complex interplay of influences.…”

Section: Discussionmentioning

confidence: 99%

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

et al. 2021

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To ensure the usability of parts made of fiber-reinforced polymers, a lifetime assessment has to be made in an early stage of the development process. To describe the whole life cycle of these parts, continuous simulation chains can be used. From production to the end of the service life, all influences are mapped virtually. The later material strength is already given after the manufacturing process due to the process dependent fiber alignment. To be able to describe this fiber orientation within the lifetime assessment, this paper presents an approach for model calibration and data set determination to consider the local micro-structure. Therefore, quasi-static and cyclic tests were performed on specimens with longitudinal and transversal fiber orientation. A supplementary failure analysis provides additional information about the local micro-structure. The local fiber orientation is determined with µCT (micro computer tomography)-measurements, correlated to the extraction positions of the specimen, and implemented in a dataset. With an attached lifetime calculation on a demonstrator, a major influence of the local micro-structure on the calculation results can be shown. Therefore, it is indispensable to consider the local fiber orientation in the data set determination of short fiber reinforced polymers.

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“…In classical Continuum Damage Mechanics CDM, the total internal energy is a state function of strain tensor  and internal damage like variable d [1], [12], [13] The consistent generalization of the isotropic damage formulation for the consideration of different failure mechanisms can be postulated by the additive decomposition of the total internal energy into multiple contributions, in which each of them is associated with a certain failure mechanism. In such a postulation, a scalar damage variable Herein, this additive decomposition postulation is applied within the context of PF approach to fracture for the prediction intra-laminar failure in UFRPs.…”

Section: Multi Phase-field Formulationmentioning

confidence: 99%

Phase-Field Modeling of Damage and Fracture in Laminated Unidirectional Fiber Reinforced Polymers

Dean

Kumar

Babiker³

et al. 2021

FJES

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The damage and fracture behavior of Fiber Reinforced Polymers (FRPs) is quite complex and is different than the failure behavior of the traditionally employed metals. There are various types of failure mechanisms that can develop during the service life of composite structures. Each of these mechanisms can initiate and propagate independently. However, in practice, they act synergistically and appear simultaneously. The difficulties that engineers face to understand and predict how these different failure mechanisms result in a structural failure enforce them to use high design safety factors and also increases the number of certification tests needed. Considering that the experimental investigations of composites can be limited, very expensive, and time-consuming, in this contribution the newly developed multi Phase-Field (PF) fracture model [1] is employed to numerically study the failure in different Unidirectional Fiber Reinforced Polymers (UFRPs) laminates, namely, fracture in single-edge notched laminated specimens, matrix cracking in cross-ply laminates, and delamination migration in multi-layered UFRPs. The formulation of the PF model incorporates two independent PF variables and length scales to differentiate between fiber and inter-fiber (matrix-dominated) failure mechanisms. The physically motivated failure criterion of Puck is integrated into the model to control the activation and evolution of the PF parameters. The corresponding governing equations in terms of variational formulation is implemented into the Finite Element (FE) code ABAQUS utilizing the user-defined subroutines UMAT and UEL.

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Macro-mechanical modeling and experimental validation of anisotropic, pressure- and temperature-dependent behavior of short fiber composites

Cited by 31 publications

References 40 publications

The Effect of Filler Content on the Tensile Behavior of Polypropylene/Cotton Fiber and poly(vinyl chloride)/Cotton Fiber Composites

The Effect of Filler Content on the Tensile Behavior of Polypropylene/Cotton Fiber and poly(vinyl chloride)/Cotton Fiber Composites

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

Phase-Field Modeling of Damage and Fracture in Laminated Unidirectional Fiber Reinforced Polymers

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