Development and assessment of modelling strategies to predict failure in tow-based discontinuous composites

Li, Yizhuo; Pimenta, Soraia

doi:10.1016/j.compstruct.2018.05.128

Cited by 26 publications

(31 citation statements)

References 31 publications

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“…Li and Pimenta [21] have predicted the effect of tow thickness on the strength of TBDCs using analytical models specifically developed for these materials. These models were based on (i) equivalent laminates (in which each lamina is an unidirectional discontinuous ply with the same tow geometry as in the actual TBDC [5]) and (ii) shear-lag considering the the non-linear shear response of the matrix up to failure [13].…”

Section: Introductionmentioning

confidence: 99%

Ultra-strong and stiff randomly-oriented discontinuous composites: Closing the gap to quasi-isotropic continuous-fibre laminates

Alves

Carlstedt

Ohlsson

et al. 2020

Composites Part A: Applied Science and Manufacturing

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Section: Introductionmentioning

confidence: 99%

Ultra-strong and stiff randomly-oriented discontinuous composites: Closing the gap to quasi-isotropic continuous-fibre laminates

Alves

Carlstedt

Ohlsson

et al. 2020

Composites Part A: Applied Science and Manufacturing

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“…SMCs with those randomly oriented strands (ROS) show a high degree of heterogeneity (variability in intra-and inter-part structure on the meso-and macro-scale) yet seek to reach quasiisotropic mechanical properties [13][14][15]. This material class is also called prepreg platelet molding compound (PPMC) [4,[16][17][18][19][20][21][22][23][24][25][26][27] or tow-based discontinuous composite (TBDC) [28][29][30][31][32][33]. The material system is characterized by a high fiber volume fraction with good impregnation, comparable to continuous fiber layups, and therefore higher mechanical properties are reachable than with traditional SMCs [18].…”

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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“…However, the composition of these materials and the flow behaviour during compression moulding result in a complex stochastic mesostructure which presents a challenge in the modelling of the mechanical behaviour. Experimental and numerical studies by various authors have shown that the mechanical performance of prepreg platelet based CF-SMC composites is primarily determined on the mesoscale by the platelet dimensions and properties and the interaction between the platelets [4][5][6]. Consequently, a three-dimensional material characterisation is essential to achieve a better understanding of the high complexity of the material's mesostructure.…”

Section: Introductionmentioning

confidence: 99%

Mesostructural simulation of discontinuous prepreg platelet based carbon fibre sheet moulding compounds informed by X-ray computed tomography

Stelzer

Plank

Major

2020

Nondestructive Testing and Evaluation

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Discontinuous prepreg platelet based carbon fibre sheet moulding compound (CF-SMC) materials offer huge potential for lightweight applications in the automotive industry. The composition of these materials and the flow behaviour during compression moulding result in a complex stochastic mesostructure, which presents a challenge in the modelling of the mechanical behaviour. The objective of the current work is to use the information obtained from multiscale X-ray computed tomography (XCT) scans to generate full-scale threedimensional finite element models of tensile coupon specimens for the prediction of the elastic modulus. The models incorporate the stochastic distribution and discontinuous nature of the prepreg platelets. Defects such as porosity, resin-rich areas and fibre waviness can be observed by means of XCT. Porosity is found to be below 0.0076 vol.% and thus negligible. An average volume fraction of 6.48 vol.% of interlaminar resin-rich areas is considered in the mesostructural simulations. The predicted values of the tensile modulus are validated by experimental tensile tests on basis of a large series of specimens. The statistical analysis of variance methodology is employed to reach conclusive validation. The inherent stochasticity of prepreg platelet based CF-SMC materials is well captured with the proposed mesostructural simulation approach and the variability in their mechanical properties is accurately predicted.

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Development and assessment of modelling strategies to predict failure in tow-based discontinuous composites

Cited by 26 publications

References 31 publications

Ultra-strong and stiff randomly-oriented discontinuous composites: Closing the gap to quasi-isotropic continuous-fibre laminates

Ultra-strong and stiff randomly-oriented discontinuous composites: Closing the gap to quasi-isotropic continuous-fibre laminates

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

Mesostructural simulation of discontinuous prepreg platelet based carbon fibre sheet moulding compounds informed by X-ray computed tomography

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