Anisotropic meanfield modeling of debonding and matrix damage in SMC composites

Schemmann, Malte; Görthofer, Johannes; Seelig, Thomas; Hrymak, Andrew N.; Böhlke, Thomas

doi:10.1016/j.compscitech.2018.03.041

Cited by 38 publications

(18 citation statements)

References 47 publications

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“…The presented, physically motivated and non-linear damage model by Schemmann et al [1] is able to predict the evolution of load-carrying fibers and matrix damage on the microscale. The model yields reasonable results for the macroscopic stress-strain relation.…”

Section: Discussionmentioning

confidence: 99%

“…According to [1] the SMC composite is considered a two-phase composite consisting of a matrix phase with volume fraction and glass fibers with volume fraction 1 . The matrix and fibers are modeled linear elastic with isotropic stiffnesses and , respectively.…”

Section: Fundamentalsmentioning

confidence: 99%

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confidence: 99%

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Sensitivity Analysis of Fiber-Matrix Interface Parameters in an SMC Composite Damage Model

Görthofer

Schemmann

Seelig

et al. 2018

The 18th International Conference on Experimental Mechanics

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This contribution shortly introduces the anisotropic, micromechanical damage model for sheet molding compound (SMC) composites presented in the authors' previous publication [1]. As the considered material is a thermoset matrix reinforced with long (≈25 mm) glass fibers, the leading damage mechanisms are matrix micro-cracking and fiber-matrix interface debonding. Those mechanisms are modeled on the microscale and within a Mori-Tanaka homogenization framework. The model can account for arbitrary fiber orientation distributions. Matrix damage is considered as an isotropic stiffness degradation. Interface debonding is modeled via a Weibull interface strength distribution and the inhomogeneous stress distribution on the lateral fiber surface. Hereby, three independent parameters are introduced, that describe the interface strength and damage behavior, respectively. Due to the high non-linearity of the model, the influence of these parameters is not entirely clear. Therefore, the focus of this contribution lies on the variation and discussion of the above mentioned interface parameters.

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Section: Discussionmentioning

confidence: 99%

Section: Fundamentalsmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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Sensitivity Analysis of Fiber-Matrix Interface Parameters in an SMC Composite Damage Model

Görthofer

Schemmann

Seelig

et al. 2018

The 18th International Conference on Experimental Mechanics

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“…The shorter the required flow length to fill the mold, the lower is the possibility of fiber attrition [3]. Since typical sheet molding compounds (SMC) charge coverages lead to comparably short flow paths, the reinforcing fibers maintain their length [3,4] and compression molded DFCs show more advanced mechanical properties with high mass-specific stiffness and strength than compared to injection molded long fiber reinforced polymers [3,5].…”

Section: Motivation and Materialsmentioning

confidence: 99%

Direct Fiber Simulation of a Compression Molded Ribbed Structure Made of a Sheet Molding Compound with Randomly Oriented Carbon/Epoxy Prepreg Strands—A Comparison of Predicted Fiber Orientations with Computed Tomography Analyses

2020

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Discontinuous fiber composites (DFC) such as carbon fiber sheet molding compounds (CF-SMC) are increasingly used in the automotive industry for manufacturing lightweight parts. Due to the flow conditions during compression molding of complex geometries, a locally varying fiber orientation evolves. Knowing these process-induced fiber orientations is key to a proper part design since the mechanical properties of the final part highly depend on its local microstructure. Local fiber orientations can be measured and analyzed by means of micro-computed tomography (µCT) and digital image processing, or predicted by process simulation. This paper presents a detailed comparison of numerical and experimental analyses of compression molded ribbed hat profile parts made of CF-SMC with 50 mm long randomly oriented strands (ROS) of chopped unidirectional (UD) carbon/epoxy prepreg tape. X-ray µCT scans of three entire CF-SMC parts are analyzed to compare determined orientation tensors with those coming from a direct fiber simulation (DFS) tool featuring a novel strand generation approach, realistically mimicking the initial ROS charge mesostructure. The DFS results show an overall good agreement of predicted local fiber orientations with µCT measurements, and are therefore precious information that can be used in subsequent integrative simulations to determine the part’s mesostructure-related anisotropic behavior under mechanical loads.

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“…Some more recent efforts include Li et al [3], Oter et al [24], Song et al [25], and Motaghi [26]. Several relatively new studies have also concerned the modeling of the entire process chain [27,28], concerning both process modeling [29,30] and mechanical modeling [31,32].…”

Section: Introductionmentioning

confidence: 99%

Review of the Numerical Modeling of Compression Molding of Sheet Molding Compound

et al. 2020

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A review of the numerical modeling of the compression molding of the sheet molding compound (SMC) is presented. The focus of this review is the practical difficulties of modeling cases with high fiber content, an area in which there is relatively little documented work. In these cases, the prediction of the flows become intricate due to several reasons, mainly the complex rheology of the compound and large temperature gradients, but also the orientation of fibers and the micromechanics of the interactions between the fluid and the fibers play major roles. The details of this during moldings are discussed. Special attention is given to the impact on viscosity from the high fiber volume fraction, and the various models for this. One additional area of interest is the modeling of the fiber orientation.

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Anisotropic meanfield modeling of debonding and matrix damage in SMC composites

Cited by 38 publications

References 47 publications

Sensitivity Analysis of Fiber-Matrix Interface Parameters in an SMC Composite Damage Model

Sensitivity Analysis of Fiber-Matrix Interface Parameters in an SMC Composite Damage Model

Direct Fiber Simulation of a Compression Molded Ribbed Structure Made of a Sheet Molding Compound with Randomly Oriented Carbon/Epoxy Prepreg Strands—A Comparison of Predicted Fiber Orientations with Computed Tomography Analyses

Review of the Numerical Modeling of Compression Molding of Sheet Molding Compound

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