Analysis Models for Polymer Composites Across Different Length Scales

Camanho, P.P.; Arteiro, Albertino

doi:10.1007/978-3-319-46120-5_9

Cited by 3 publications

(3 citation statements)

References 104 publications

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“…To ensure that transverse cracking initiates at the intersection with the failure surface, i.e., when the condition

is met, an iterative scheme based on the Newton–Raphson method was employed, following Refs. [ 40 , 41 ].…”

Section: Materials Modelmentioning

confidence: 99%

Mesoscale Model for Composite Laminates: Verification and Validation on Scaled Un-Notched Laminates

Corrado,

Arteiro,

Marques

et al. 2024

Polymers

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This paper presents a mesoscale damage model for composite materials and its validation at the coupon level by predicting scaling effects in un-notched carbon-fiber reinforced polymer (CFRP) laminates. The proposed material model presents a revised longitudinal damage law that accounts for the effect of complex 3D stress states in the prediction of onset and broadening of longitudinal compressive failure mechanisms. To predict transverse failure mechanisms of unidirectional CFRPs, this model was then combined with a 3D frictional smeared crack model. The complete mesoscale damage model was implemented in ABAQUS®/Explicit. Intralaminar damage onset and propagation were predicted using solid elements, and in-situ properties were included using different material cards according to the position and effective thickness of the plies. Delamination was captured using cohesive elements. To validate the implemented damage model, the analysis of size effects in quasi-isotropic un-notched coupons under tensile and compressive loading was compared with the test data available in the literature. Two types of scaling were addressed: sublaminate-level scaling, obtained by the repetition of the sublaminate stacking sequence, and ply-level scaling, realized by changing the effective thickness of each ply block. Validation was successfully completed as the obtained results were in agreement with the experimental findings, having an acceptable deviation from the mean experimental values.

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“…To ensure that transverse cracking initiates at the intersection with the failure surface, i.e., when the condition

is met, an iterative scheme based on the Newton–Raphson method was employed, following Refs. [ 40 , 41 ].…”

Section: Materials Modelmentioning

confidence: 99%

Mesoscale Model for Composite Laminates: Verification and Validation on Scaled Un-Notched Laminates

Corrado,

Arteiro,

Marques

et al. 2024

Polymers

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“…A numerical framework is built for unstable crack propagation modelling, making use of the size effect method [18], having the advantages of: limiting the detailed region to a small embedded cell (EC) around the pre-crack tip; generating small virtual specimen geometries which are hard or even impossible to manufacture experimentally; and avoiding the necessity to track the position of the crack tip throughout the numerical simulations. The predictive capability of computational mechanics for heterogeneous materials largely depends on the scale at which damage is explicitly modelled [30,31]. In particular, micromechanics can be used as a reliable tool for analysis and derivation of upscaled material properties in composite materials [32,33,34,35,36,37].…”

Section: Introductionmentioning

confidence: 99%

Estimating the mode I through-thickness intralaminar R-curve of unidirectional carbon fibre-reinforced polymers using a micromechanics framework combined with the size effect method

Varandas

Dalli

Catalanotti

et al. 2022

Composites Part A: Applied Science and Manufacturing

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“…This apparent contradiction makes them advantageous when compared to metals, particularly for parts under variable loads, subject to fatigue. The reason is the complex and interactive relationship between fibers, damage, and residual stresses that blocks the spread of the damage 8 . A critical issue with composites is their vulnerability to low energy/speed impacts, which can cause considerable damage to the interior of the parts without anomalies on the impacted surfaces.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Ultrasonic Methods for Detecting Defects in Unidirectional Composite Material

2021

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Non-destructive tests are of pivotal importance in the industry, as they contribute to the decreasing of maintenance costs, reducing downtime and accidents. Ultrasound is a non-destructive method that can be used with several arrangements to identify faults in engineering materials. This work evaluated the use of three ultrasonic methods applied in FRP composites to detect manufacturing defects. The critically refracted longitudinal wave (LCR), the B-Scan images, and the signal-to-noise ratio of TFM (Total Focusing Method) images were compared to detect the delamination and the fiber waviness in unidirectional composite of carbon/epoxy. Rectangular samples without defects and with defects were used in the tests. To obtain the delamination in the samples, pieces of Teflon were placed between layers and for the samples with waviness, a silica sphere was used. The results showed that LCR wave is not recommended to detect these kinds of defects, the B-Scan image is efficient in detecting delamination, and the SNR variation of TFM images allows to identify the waviness and delamination in unidirectional FRP composites.

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Analysis Models for Polymer Composites Across Different Length Scales

Cited by 3 publications

References 104 publications

Mesoscale Model for Composite Laminates: Verification and Validation on Scaled Un-Notched Laminates

Mesoscale Model for Composite Laminates: Verification and Validation on Scaled Un-Notched Laminates

Estimating the mode I through-thickness intralaminar R-curve of unidirectional carbon fibre-reinforced polymers using a micromechanics framework combined with the size effect method

Comparison of Ultrasonic Methods for Detecting Defects in Unidirectional Composite Material

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