Virtual testing framework for hybrid aligned discontinuous composites

Henry, J.; Pimenta, Soraia

doi:10.1016/j.compscitech.2017.12.007

Cited by 13 publications

(24 citation statements)

References 46 publications

(113 reference statements)

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“…The analytical self-similar model predicts the response of the level-0 BaM microstructure using a shear-lag approach for simple BaM composites with linear-elastic bricks and bilinear matrix response (Pimenta and Robinson, 2014). Subsequently, the non-linear stress-strain curve of the level-0 BaM microstructure is approximated by a piecewise linear curve, and is used as the input for the brick material response of the BaM structure of level-1; this required extending the existing formulation for linear-elastic bricks Robinson, 2014, Henry andPimenta, 2018) to non-linear elastic bricks (see App. A).…”

Section: Symmetry Boundary Conditionmentioning

confidence: 99%

Increasing damage tolerance in composites using hierarchical brick-and-mortar microstructures

Henry

Pimenta

2018

Journal of the Mechanics and Physics of Solids

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Composites are attractive materials because of their high specific stiffness and specific strength, but their application in industry is restricted by their inherent lack of damage tolerance and stable energy dissipation mechanisms, due to the brittleness of the fibres. Nature overcomes a similar issue by arranging natural composites, made of mostly brittle constituents, in discontinuous and hierarchical microstructures. This work aims at evaluating the potential of hierarchical discontinuous carbon-fibre reinforced polymers to achieve damage tolerance, by a combination of modelling and experiments. Two different models (one analytical and the other numerical) are developed to predict the tensile response of hierarchical brick-and-mortar microstructures with two levels of hierarchies, and to design specimens with a non-linear response. Such specimens are then manufactured using laser micro-milled carbon/epoxy thin-plies, and tested under tension. The results show that the presence of discontinuities and hierarchies promotes stable energy dissipation before failure, ensures damage diffusion throughout the specimen, and delays damage localisation in otherwise brittle composites.

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Section: Symmetry Boundary Conditionmentioning

confidence: 99%

Increasing damage tolerance in composites using hierarchical brick-and-mortar microstructures

Henry

Pimenta

2018

Journal of the Mechanics and Physics of Solids

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“…• Fibre fragmentation defects (created, for example, from mishandling or damage during manufacture of the composite material) are modelled by inserting fibre fragmentations at a random location along a controlled percentage (ζ rf ) of fibres before the start of the simulation (see Figure 2a). A fragmentation defect reduces the length of one of the two overlaps in the fibre-fibre interaction; it also creates a new broken segment in the interaction (shown with length δb a in Figure 2a), whose stress-strain response is calculated in the same manner as per Henry and Pimenta [24].…”

Section: Modelling Defectsmentioning

confidence: 99%

“…The VTF can model hybrid [24,23,25] (whereby each fibre-type has a different Young's modulus, a different diameter, and a different stochastic strength distribution) or nonhybrid [19] aligned discontinuous fibre reinforcements. For the sake of simplicity, this paper features only high-modulus carbon / E-glass hybrid ADCs; however, any combination of fibre-types can be used, simply by replacing the fibre property inputs to the VTF.…”

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“…All fibres in each virtual specimen are assumed to have equal length (l f ) at the start of the simulation, and the random location of the fibre ends is modelled according to a uniform random distribution. The fibre-type arrangement of hybrid ADCs can be modelled by randomly intermingling the fibre-types [24] using a uniform random distribution, or by specifying the fibre-type arrangement [25]. The cross-section of the virtual specimen can form a rectangle with any aspect ratio, and the number of fibres in the virtual specimen can be selected to match that of a real tensile specimen.…”

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The influence of variability and defects on the mechanical performance of tailorable composites

Finley

Henry

Shaffer

et al. 2019

Journal of Composite Materials

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Aligned hybrid-fibre discontinuous composites offer the ability to tailor their mechanical response through careful microstructural design. However, with tailorability comes microstructural complexity, which in turn leads to many sources of variability and defects. A virtual testing framework was further extended to investigate the influence of variability and defects on the mechanical performance of various aligned discontinuous composite material systems. This approach identified the most critical sources of variability as (i) fibre strength, (ii) the distance between fibre ends, or (iii) the level of fibre-type intermingling, depending on the material system. Fibre vacancy defects were shown to have the most significant influence on the strength and ductility of aligned discontinuous composites, although this sensitivity can be reduced through hybridisation of the fibre types.

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“…Moreover, elastic-hardening-softening model ( Fig. 2i) was also proposed [31,32]. Investigations using shear lag model with piecewise linear model ( Fig.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of viscoelasticity on interfacial stress transfer mechanism in the biocomposites: A theoretical study of viscoelastic shear lag model

Yuan

2019

Composites Part B: Engineering

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Biocomposites with regularly staggered alignment microstructure are frequently observed in natural biological tissues, and exhibit superior mechanical behavior. Owing to their viscoelastic nature, biocomposites exhibit stress rate-dependent stiffness function and mechanical behavior. In this paper, a linear viscoelastic shear lag model (SLM) is proposed to illustrate the micromechanical behavior of biocomposites under triangular loading pulse. Theoretical and numerical results are derived to predict the deformation and stress transfer between fibers and interfibrous matrix while the biocomposites are transiently stretched. The results from the analytical and numerical solutions demonstrate that how the fiber overlap length and loading rate affect the stress transfer and mechanical properties of biocomposties. The structure-property correlation is illustrated for viscoelastic biomaterials under transient loading, and the existence of characteristic length of soft matter with viscoelastic property is involved in load transfer mechanism between the adjacent reinforcements in transient regime, which optimizes the load transfer mechanism between the adjacent reinforcements. Furthermore, we found that discontinuous fibril model could ensure large relative sliding deformation, helping dissipate energy, protecting fibril from overall damage, and achieving high ductility and high toughness, which can provide beneficial design strategies for engineering fiber reinforced composites.

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Virtual testing framework for hybrid aligned discontinuous composites

Cited by 13 publications

References 46 publications

Increasing damage tolerance in composites using hierarchical brick-and-mortar microstructures

Increasing damage tolerance in composites using hierarchical brick-and-mortar microstructures

The influence of variability and defects on the mechanical performance of tailorable composites

Effect of viscoelasticity on interfacial stress transfer mechanism in the biocomposites: A theoretical study of viscoelastic shear lag model

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