Analysis of mode III interlaminar fracture toughness of laminated composites using a novel testing device

López-Menéndez, Ana Jesús; Viña, J.; Argüelles, A.; Viña, I.; Rubiera, S.

doi:10.1016/j.engfracmech.2017.01.021

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…The dynamic load was applied at a distance of 1 mm from the crack front, given that the existing percentage of mode II fracture is negligible compared to mode III fracture in this situation, as previously demonstrated [18].…”

Section: Methodsmentioning

confidence: 99%

“…Nonetheless, the ECT device and its successive derivations have not been shown to be valid for analysing the mode III behaviour of materials of this type when they are subjected to dynamic fatigue loading. In this case, as demonstrated in this paper, only the longitudinal half fixed beam (LHFB) device [17,18] allows the fatigue behaviour of composite laminates to be studied in a relatively simple way.…”

Section: Introductionmentioning

confidence: 99%

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Use of a LHFB Device for Testing Mode III in a Composite Laminate

et al. 2019

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The present paper studies the fatigue delamination behaviour of an epoxy/carbon composite material under mode III loading using a longitudinal half fixed beam (LHFB) device initially designed for mode III static tests of composite materials formed by the stacking of plies. For this purpose, a series of tests was carried out at different levels of loading representative of the fatigue behaviour of the material, from the crack onset phase through the delamination phase to final fracture. The experimental results were treated statistically, obtaining the values of the fatigue limit for probabilities of fracture of 5% and 50%. Finally, a fractographic analysis of the fracture surfaces was performed which allowed us to identify the same characteristic patterns of static mode III fracture, namely broken fibres, cusps and saw-teeth, in addition to a new morphology consisting of the formation of agglomerations of resin produced by the friction between the lips of the specimen in the fracture zone that point to dynamic mode III fracture. These agglomerations eventually crack and become detached from the fibres, leaving these free of resin.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of a LHFB Device for Testing Mode III in a Composite Laminate

et al. 2019

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“…In Figure 6, the images obtained from a specimen tested with the load always applied in the same direction show the presence of the likewise characteristic cusps and broken fibres of static fractography. 24,27 Figure 7 shows the appearance of "beds" of resin in the specimens tested with the load always applied in the same direction. This represents a specific fractographic feature of fatigued surfaces under mode III fracture.…”

Section: Fractographymentioning

confidence: 99%

“…Finally, the longitudinal half fixed beam (LHFB) method [22][23][24] has been presented. Finally, the longitudinal half fixed beam (LHFB) method [22][23][24] has been presented.…”

Section: Introductionmentioning

confidence: 99%

“…Several other methods have subsequently emerged whose their success has been rather limited, although all of them have made an important contribution to knowledge in this field. Finally, the longitudinal half fixed beam (LHFB) method [22][23][24] has been presented. This method has an important drawback, namely, that it requires a testing machine capable of applying a torque.…”

Section: Introductionmentioning

confidence: 99%

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Symmetric and asymmetric dynamic characterization of mode‐III fracture in epoxy/unidirectional carbon‐fibre composites

Bertorello

Viña

Bonhomme

et al. 2019

Fatigue Fract Eng Mat Struct

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This paper experimentally analyses the delamination behaviour of a composite material under mode III fracture as a function of the loading mode applied during the fatigue tests was carried out in two different ways. First, the test specimens were loaded cyclically in a single direction of delamination until reaching a certain fracture energy and subsequently returning to the starting point. Second, cyclic loading was applied both in one direction of delamination and in the opposite direction until reaching the same fracture energies, though in two opposite directions. The experimental results revealed clear differences in the fatigue behaviour of the material when the way of applying the load varied. In both cases, a statistical analysis of the results was carried out in order to evaluate the existing differences more suitably. Furthermore, a fractographic analysis was conducted for both types of loading in order to distinguish possible differences at the microstructural level.

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A review on self‐healing polymers and polymer composites for structural applications

et al. 2022

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Polymer composites when employed for structural applications undergo dynamic stresses and strains that initiate fatigue‐induced microcracks, which by their coalescence cause the failure of the materials, thus limiting their service life. To overcome this hurdle, one of the recent approaches relies on the development of smart self‐healing polymers that, analogously to biological systems, can use damage as a trigger to activate the self‐repair phenomenon, thus extending their service life. This work reviews the self‐healing approach in polymer‐based materials for structural applications. It focuses on three main aspects, which are also explained with schematics that illustrate the mechanisms involved. The first aspect describes the different strategies adopted for self‐healing polymeric structures, the self‐healing agents used, as well as the reactions responsible for repairing the damage. The second part is focused on the methods used to disperse the self‐healing agents and catalysts within the polymer systems. The third section details the different self‐healing mechanisms and the effectiveness of self‐healing approaches in terms of mechanical and dynamical‐mechanical behavior of materials. Challenges and future research outlook highlighting the importance of relaxation time and fatigue characterization and to understand the mechanisms and possible improvements are also presented.

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Analysis of mode III interlaminar fracture toughness of laminated composites using a novel testing device

Cited by 12 publications

References 25 publications

Use of a LHFB Device for Testing Mode III in a Composite Laminate

Use of a LHFB Device for Testing Mode III in a Composite Laminate

Symmetric and asymmetric dynamic characterization of mode‐III fracture in epoxy/unidirectional carbon‐fibre composites

A review on self‐healing polymers and polymer composites for structural applications

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