The scale effect in composites: An explanation physically based on the different mechanisms of damage involved in failure

Parı́s, F.; Velasco, María Luisa Pro; Correa, E.

doi:10.1016/j.compstruct.2020.113089

Cited by 17 publications

(6 citation statements)

References 40 publications

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“…It is worth mentioning that these results seem to be in accordance with the expected fact if both prepregs were made of the same fibers and resin. Specifically, according to the physically based explanation of the scale effect in composite laminates involving UTP prepregs, París et al, 28 the transverse damage is delayed when ultra‐thin plies are involved.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the improvement of fatigue life may also be explained due to the different microstructure of the samples (Figure 12), discriminating between conventional and ultra‐thin prepregs, and considering the different pattern for the appearance of transverse damage when ultra‐thin plies are involved as París et al 28 detailed. Whereas 3bC and 7bC have been manufactured using just 10 plies, 7bUT has been performed using 36 plies to achieve the same laminate thickness.…”

Section: Resultsmentioning

confidence: 99%

“…Many researchers have experimentally assessed the influence of the thickness of the weakest lamina under quasi-static load although few of them have used ultra-thin plies. Recently, París et al 28,29 have physically explained the scale effect based on the damage mechanisms involved in quasi-static failure after a wide variety of experimental programs and numerical correlations, demonstrating that the first damage in the weakest lamina is delayed as long as its thickness decreases and expounding the change in the quasi-static damage mechanisms. However, few researchers have micromechanically looked into this phenomenon under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue life of unidirectional 90° carbon/epoxy laminates made of conventional and ultra‐thin plies varying manufacturing and testing conditions

Sánchez‐Carmona

Correa

Barroso

et al. 2023

Fatigue Fract Eng Mat Struct

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Unidirectional 90° laminates (UD‐90) have been tested under tension–tension loading (R = 0.1) to comprehend the effect of different conditions on their fatigue life. Four different case studies have been evaluated: the existence of porosity using two different UD‐90 laminates cured at different pressures in an autoclave, the importance of the surface finishing when a pressure plate is used, the effect of load frequency, and the relevance of the prepreg thickness comparing 190 and 50 g/m2 prepregs while keeping the total thickness of the laminates constant. All these case studies have been analyzed employing S–N curves as the starting point of the authors' current research for the prediction of the onset of transverse damages in ultra‐thin plies in the assessment of different cross‐ply laminates under cyclic loading.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue life of unidirectional 90° carbon/epoxy laminates made of conventional and ultra‐thin plies varying manufacturing and testing conditions

Sánchez‐Carmona

Correa

Barroso

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…They concluded that the utilization of thin-ply can decrease the slope of the S-N curve for the laminate and, evidently, enhance the fatigue life [149]. París et al [150], to clarify the concept of size effect, offered a physical explanation of failure mechanisms observed during quasi-static tensile loading. By adopting an energetic approach, they investigated the progressive development of damage mechanisms within the weakest lamina, specifically the 90 • ply block.…”

Section: Hybrid Composite Laminatementioning

confidence: 99%

Enhancing Fatigue Life and Strength of Adhesively Bonded Composite Joints: A Comprehensive Review

Malekinejad,

Carbas,

Akhavan-Safar

et al. 2023

Materials

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Adhesive bonding is widely seen as the most optimal method for joining composite materials, bringing significant benefits over mechanical joining, such as lower weight and reduced stress concentrations. Adhesively bonded composite joints find extensive applications where cyclic fatigue loading takes place, but this might ultimately lead to crack damage and safety issues. Consequently, it has become essential to study how these structures behave under fatigue loads and identify the remaining gaps in knowledge to give insights into new possibilities. The fatigue life of adhesively bonded composite joints is influenced by various parameters, including joint configuration and material properties of adherends and adhesive. Numerous studies with varying outcomes have been documented in the literature. However, due to the multitude of influential factors, deriving conclusive insights from these studies for practical design purposes has proven to be challenging. Hence, this review aims to address this challenge by discussing different methods to enhance the fatigue performance of adhesively bonded composite joints. Additionally, it provides a comprehensive overview of the existing literature on adhesively bonded composite joints under cyclic fatigue loading, focusing on three main aspects: Adherends modification, adhesive modification, and joint configurations. Since the effect of modifying the adhesive, adherends, and joint configurations on fatigue performance has not been comprehensively studied in the literature, this review aims to fill this gap by compiling and comparing the relevant experimental data. Furthermore, this review discusses the challenges and limitations associated with the methods that can be used to monitor the initiation and propagation of fatigue cracks.

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“…The scale effect has been observed not only in soils, but also in many types of materials, such as metals [ 28 , 29 , 30 , 31 ], or in composite materials in terms of their strength properties [ 1 , 32 , 33 , 34 ]. Regarding the study of compressive strength, the scale effect is the subject of extensive research in the case of concrete samples.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Scale Effect on Bearing Capacity of Undrained Subsoil: Implications for Seismic Resilience of Shallow Foundations

Zięba,

Krokowska,

Wyjadłowski

et al. 2023

Materials

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This research investigates the influence of the scale effect on the bearing capacity of fine-grained subsoil under undrained conditions. The analyses were conducted based on laboratory tests of silty clay. Uniformly compacted samples were subjected to an unconfined compression test. The research was performed on cylindrical specimens. Three different variants of the diameter D (38 mm, 70 mm, 100 mm) and the corresponding height H = 2D were analyzed. Based on the tests results, the unconfined compression strength qu was determined, and from this, the undrained shear strength cu was calculated. The obtained results showed a clear decrease in cu with increasing sample size. However, in the existing reference documents, there are no specific guidelines for calculations of bearing capacity with consideration of sample size effect on the soil shear strength. Therefore, this study utilized the laboratory soil test data to calculate the bearing capacity of undrained subsoil, taking into account the seismic impacts, with a particular focus on spread foundations.

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The scale effect in composites: An explanation physically based on the different mechanisms of damage involved in failure

Cited by 17 publications

References 40 publications

Fatigue life of unidirectional 90° carbon/epoxy laminates made of conventional and ultra‐thin plies varying manufacturing and testing conditions

Fatigue life of unidirectional 90° carbon/epoxy laminates made of conventional and ultra‐thin plies varying manufacturing and testing conditions

Enhancing Fatigue Life and Strength of Adhesively Bonded Composite Joints: A Comprehensive Review

Assessing the Scale Effect on Bearing Capacity of Undrained Subsoil: Implications for Seismic Resilience of Shallow Foundations

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