Effect Mechanism and Simulation of Voids on Hygrothermal Performances of Composites

Li, Zhu; Lei, Yongpeng; Zhang, Xiangyang; Kang, Zhenhang; Zhang, Jifeng

doi:10.3390/polym14050901

Cited by 17 publications

(7 citation statements)

References 34 publications

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“…7–9 In particular, Chu and Jiang numerically predicted a drop of the transverse modulus of about 10% at a void content of 4%, which correlates well with the present numerical results. 8,47 He 7 and Liu 12 predicted a strength drop between 15% and 25% at the same void content, which agrees well with the observed 15% drop in this work. With about 90,000 tetrahedron elements compared to the 600,000 used by Chu in Ref.…”

Section: Evaluation Of Materials Scatter In Composite Unit Cellssupporting

confidence: 90%

“…Liu applied the methodology to establish the influence of voids on the residual stresses resulting from hygroscopic expansion in water absorption process. 12 The chosen geometrical representation of voids increases the simulation’s accuracy but inherently involves finer mesh sizes, especially in the vicinity of the microscopic voids. Consequently, higher computational efforts are necessary for the uncertainty quantification (UQ).…”

Section: Introductionmentioning

confidence: 99%

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Stochastic modelling of continuous glass-fibre reinforced plastics–considering material uncertainty in microscale simulations

Vinot

Liebold²,

Usta³

et al. 2022

Journal of Composite Materials

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This paper presents a probabilistic micromechanics-based approach to simulate the influence of scatter sources in composite materials as an alternative to deterministic approaches. Focus is given to the effect of microscopic and macroscopic voids, material inhomogeneity induced by manufacturing processes and stochastic fibre patterns on the mechanical properties of continuous glass-fibre reinforced polymer components. Various periodic unit cells of neat resin and embedded fibre clusters are generated with random distributions of the abovementioned scatter sources, while the voids are represented by degrading locally the pristine properties in an element-wise manner. Subsequently, the models are mechanically loaded under transverse tension as an exemplary case and the resulting responses are correlated with the stochastic inputs. In particular, the relative influence of pore size, porosity and fibre/resin interface strength on the transverse tension modulus and strength of unidirectional composites are numerically investigated. The present approach is suggested as a computational efficient but reliable alternative to geometrical representations of imperfection in composite materials.

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Section: Evaluation Of Materials Scatter In Composite Unit Cellssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Stochastic modelling of continuous glass-fibre reinforced plastics–considering material uncertainty in microscale simulations

Vinot

Liebold²,

Usta³

et al. 2022

Journal of Composite Materials

View full text Add to dashboard Cite

show abstract

“…On the other hand, a 0.4 wt% GO sample absorbed more significant moisture in the starting days but eventually decrease in water absorption was recorded due to a better interface between GO and GF-epoxy composite that reduced the further inclusion of water in the vicinity of the composite. [39][40][41][42][43][44] A total of 1.2 wt% GO composite sample did not allow water to penetrate and showed resistance to water at the start, but due to agglomeration of GO in the vicinity of the interface, water absorption was increased after 24 days.…”

Section: Scanning Electron Microscopy and Eds Analysismentioning

confidence: 99%

Fabrication and characterization of graphene oxide and glass fiber‐based hybrid epoxy composites

et al. 2022

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This work aims to develop and characterize graphene oxide (GO) and glass fiber (GF)-based hybrid epoxy composites. Graphite oxide was synthesized by improved Hummers' method, and it was uniformly dispersed in ethanol by ultra-sonication to form GO suspension. Later, GO and GF-based hybrid epoxy composites were prepared by hand layup method followed by curing under compression to develop composite sheets accordingly to the ASTM standards (D3039 & D6110-18). Fourier transform infrared spectra of the neat and the GF-based hybrid epoxy composites confirmed the formation of improved interface between GO/epoxy and silane coating present on GF surface, which is well validated with the given reaction schematic. Scanning electron microscope and elemental mapping results corroborate our point that the GO filled the voids and empty spaces and lessened the water absorption properties of the composite which is much needed for the application of composites at high altitudes and marine environment. Effect of GO content on mechanical properties of prepared composites was studied by varying the GO content from 0.1 to 1.2 wt%. Mechanical characterization of GO and GF-based hybrid epoxy composites were carried out by tensile and impact testing. Ultimate tensile strength,

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“…Vipin Kumar [ 28 ] produced a large-scale multimaterial by additive manufacturing (AM) undergoing compression molding (CM) to produce high-performance thermoplastic composites reinforced with short carbon fibers. Zhu Liu [ 29 ] established a microscale unit cell with a random distribution of fibers, interfaces, and voids based on the random sequential adsorption algorithm to investigate the quantitative effects of void content on the strength and modulus under the loading of transverse tension.…”

Section: Introductionmentioning

confidence: 99%

Research on Void Dynamics during In Situ Consolidation of CF/High-Performance Thermoplastic Composite

et al. 2022

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Automated fiber placement (AFP) in situ consolidation of continuous CF/high-performance thermoplastic composite is the key technology for efficient and low-cost manufacturing of large thermoplastic composites. However, the void in the in situ composite is difficult to eliminate because of the high pressure and the short consolidation time; the void content percentage consequently is the important defect that determines the performance of the thermoplastic composite parts. In this paper, based on the two-dimensional Newtonian fluid extrusion flow model, the void dynamics model and boundary conditions were established. The changes of the void content percentage were predicted by the cyclic iteration method. It was found that the void content percentage increased gradually along the direction of the layers’ thickness. With the increasing of the laying speed, the void content percentage increased gradually. With the increasing of the pressure of the roller, the void content percentage gradually decreased. When the AFP speed was 11 m/min and the pressure of the compaction roller reached 2000 N, the void content percentage of the layers fell below 2%. It was verified by the AFP test that the measured results of the layers’ thickness were in good agreement with the predicted results of the model, and the test results of the void content percentage were basically equivalent to the predicted results at different AFP speeds, which indicates that the kinetic model established in this paper is representative to predict the void content percentage. According to the metallographic observation, it was also found that the repeated pressure of the roller was helpful to reduce the void content percentage.

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Effect Mechanism and Simulation of Voids on Hygrothermal Performances of Composites

Cited by 17 publications

References 34 publications

Stochastic modelling of continuous glass-fibre reinforced plastics–considering material uncertainty in microscale simulations

Stochastic modelling of continuous glass-fibre reinforced plastics–considering material uncertainty in microscale simulations

Fabrication and characterization of graphene oxide and glass fiber‐based hybrid epoxy composites

Research on Void Dynamics during In Situ Consolidation of CF/High-Performance Thermoplastic Composite

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