Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

Li, Yizhuo; Pimenta, Soraia; Singgih, Jordan; Nothdurfter, Stefan Klaus; Schuffenhauer, Karsten

doi:10.1016/j.compositesa.2017.06.031

Cited by 44 publications

(68 citation statements)

References 21 publications

(40 reference statements)

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“…In the literature, mechanical properties of TBDCs with different tow geometries and resin types have been measured. It has been found that the modulus of TBDCs generally falls between 40 and 50 GPa, whereas the tensile strength lies between 250 and 500 MPa [1,2,7,8]. In most studies, it has also been shown that, unlike conventional continuous-fibre composites, TBDCs have a slightly lower strength under tension than under compression [2,9].…”

Section: Operatorŝ Normalised Unit Vectormentioning

confidence: 99%

“…It has been shown experimentally [7] that the equivalent laminate analogy is able to capture the failure mechanisms of TBDCs, although that study also highlighted the need to consider the intrinsic variability of the microstructure in TBDCs (which is not present in their equivalent laminates in order to predict their strength) [7].…”

Section: Operatorŝ Normalised Unit Vectormentioning

confidence: 99%

“…s laminates with continuous plies, and observed experimentally that the strength of TBDCs coincide with the failure of the 90 • ply (first ply failure) in the equivalent laminate. These models provide first estimates for the strength of TBDCs, but they cannot account for some features observed experimentally (as, for instance, the significant decrease in the strength of TBDCs with increased tow thickness [7]).…”

Section: Operatorŝ Normalised Unit Vectormentioning

confidence: 99%

“…It has been experimentally observed [7] that, although TBDCs have some resin-rich packets, they do not present a significant resin-rich layer between the tows. Therefore, we assume that the thickness of the shear-lag interface is equal to the inter-fibre distance in the composite, which is calculated assuming a square fibre packing:…”

Section: Tensile Strength Of a Discontinuous Ud Ply (Micro-scale)mentioning

confidence: 99%

“…, where V f,max and V f,min are respectively the maximum and minimum values of the local fibre volume fraction, measured experimentally in the plate (75% and 44% for the thick-prepreg plate, and 68% and 49% for the thin-prepreg plate [7]). Figures 14a and 14c.…”

Section: Predicting the Local Strength Of Tbdcs With A Known Local MImentioning

confidence: 99%

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

Pimenta

2019

Composite Structures

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Section: Operatorŝ Normalised Unit Vectormentioning

confidence: 99%

Section: Operatorŝ Normalised Unit Vectormentioning

confidence: 99%

Section: Operatorŝ Normalised Unit Vectormentioning

confidence: 99%

Section: Tensile Strength Of a Discontinuous Ud Ply (Micro-scale)mentioning

confidence: 99%

Section: Predicting the Local Strength Of Tbdcs With A Known Local MImentioning

confidence: 99%

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

Pimenta

2019

Composite Structures

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Application of the stress interaction failure criterion in platelet composite compression molded parts

et al. 2021

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The stress interaction failure criterion was applied to three compression‐molded sheet molding compound (SMC) materials. Two are epoxy‐based compounds with randomly oriented carbon fiber tows, and the third material consists of glass fiber bundles randomly oriented in a vinyl ester resin. The failure surface was built using tensile test results at different orientations with respect to the flow direction, resulting in combined loads in the principal stress coordinate system. Three unknown variables arise from using only tensile strength values. Solving a system of three equations derived from the criterion function and using the failure values obtained from destructively testing at three different orientations, the unknown variables as well as the interaction strength components were determined. Results show good agreement for all three materials. Overprediction was found in some instances, attributed to the effect of fiber orientation distribution in the part, and to the complex interactions of the filled structures. To allow a more direct comparison between predicted and experimental data, the resulting failure surface was translated to the global coordinate system (σxx) and compared to the data derived from destructive tensile tests. Good agreement for all materials was observed, with underprediction noted for some orientations, attributed in part to the equation solving method and the nature of the mesostructures of the composites, where interactions between the tows, resin, mold walls, and fibers are present. The results of this work show that the methodology described permits the development of a failure surface for SMC materials when limited data is available.

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Destructive and non-destructive mechanical characterisation of chocolate with different levels of porosity under various modes of deformation

et al. 2023

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Chocolate exhibits a complex material response under the varying mechanical loads present during oral processing. Mechanical properties such as Young’s modulus and fracture stress are linked to sensorial attributes such as hardness. Apart from this link with hardness perception, these mechanical properties are important input parameters towards developing a computational model to simulate the first bite. This study aims to determine the mechanical properties of chocolate with different levels of micro-aeration, 0–15%, under varying modes of deformation. Therefore, destructive mechanical experiments under tension, compression, and flexure loading are conducted to calculate the Young’s modulus, yield, and fracture stress of chocolate. The values of Young’s modulus are also confirmed by independent ultrasonic mechanical experiments. The results showed that differences up to 35% were observed amongst the Young’s modulus of chocolate for different mechanical experiments. This maximum difference was found to drop with increasing porosity and a negligible difference in the Young’s modulus measurements amongst the different mechanical experiments is observed for the 15% micro-aerated chocolate. This phenomenon is caused by micro-pores obstructing the microscopic inelastic movement occurring from the early stages of the material’s deformation. This work provides a deeper understanding of the mechanical behaviour of chocolate under different loading scenarios, which are relevant to the multiaxial loading during mastication, and the role of micro-aeration on the mechanical response of chocolate. This will further assist the food industry’s understanding of the design of chocolate products with controlled and/or improved sensory perception.

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Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

Cited by 44 publications

References 21 publications

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

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

Application of the stress interaction failure criterion in platelet composite compression molded parts

Destructive and non-destructive mechanical characterisation of chocolate with different levels of porosity under various modes of deformation

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