Understanding the effect of anisotropy in composite materials on the performance of cruciform specimens

Moncy, A.; Castro, Oscar; Berggreen, Christian; Stang, Henrik

doi:10.1016/j.compstruct.2021.114225

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…Basic test machines for coupons are introduced to contextualize the intermediate-scale practices, but full-scale tests at the component level are outside the scope of this literature review. Basically, the range of in-plane loadings is dealt with by using unidirectional coupon tests [14,15], with bi-axial tests on cruciform samples [16][17][18] and with shear on deformable squares [19][20][21]. Cruciform samples are cross-shaped specimens where the two main directions are loaded independently to enforce bi-axial loading states of tension-tension, compression-compression or tension-compression.…”

Section: Figurementioning

confidence: 99%

Testing Structural Elements under Multiaxial Loading: A Numerical Model of the Bench to Understand and Predict Complex Boundary Conditions

Grotto,

Peta,

Bouvet

et al. 2024

Aerospace

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Airworthiness certification requires proof of structure strength, which is performed generally through a building block approach. To achieve this, representative intermediate-scale experiments generated by test benches are, in general, needed, in addition to material characterization on a coupons scale and structure testing on a large scale. The VERTEX test bench can generate the combined loading of tension/compression-shear-pressure on structural elements and was modelled with Finite Elements to perform virtual testing, representative of its intermediate-scale specificity. The numerous bolted joints of the bench were modelled and their behavior was identified in previous tests, so the model could quantitatively estimate the transfer function of the bench, which is the relationship between the displacements imposed by the jacks and the resulting loads on a given sample. The VERTEX model was identified to represent load shapes and amplitudes based on a training set and was later confronted by a validation set of tests of tension and shear. A model with ideal boundary conditions was also developed for a comparison, but it failed to predict some load shape specificities and did not give any indication of the loading amplitude. Application cases of the developed model are shown to assess a range of virtual testing possibilities.

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Section: Figurementioning

confidence: 99%

Testing Structural Elements under Multiaxial Loading: A Numerical Model of the Bench to Understand and Predict Complex Boundary Conditions

Grotto,

Peta,

Bouvet

et al. 2024

Aerospace

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show abstract

“…Finally, it should be noted that this technology is not only used for test monitoring, but can also intervene in testing control. Moncy et al [46,94,95] highlighted the need to carry out strain control, which produces more adequate results than methodologies based on force or displacement control when studying crack growth. However, strain control requires taking into account material stiffness degradation.…”

Section: Strain Monitoring and Controlling Techniquesmentioning

confidence: 99%

Advances in Cruciform Biaxial Testing of Fibre-Reinforced Polymers

Muñoz

Moreno

2022

Polymers

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The heterogeneity and anisotropy of fibre-reinforced polymer matrix composites results in a highly complex mechanical response and failure under multiaxial loading states. Among the different biaxial testing techniques, tests with cruciform specimens have been a preferred option, although nowadays, they continue to raise a lack of consensus. It is therefore necessary to review the state of the art of this testing methodology applied to fibre-reinforced polymers. In this context, aspects such as the specific constituents, the geometric design of the specimen or the application of different tensile/compressive load ratios must be analysed in detail before being able to establish a suitable testing procedure. In addition, the most significant results obtained in terms of the analytical, numerical and experimental analyses of the biaxial tests with cruciform specimens are collected. Finally, significant modifications proposed in literature are detailed, which can lead to variants or adaptations of the tests with cruciform specimens, increasing their scope.

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Optimization on Cruciform Specimen Geometries of AA5052 Under Equi-Biaxial Loading: Acquisition of Ultimate Fracture Strain

Chen,

Cai,

Cui

et al. 2023

Exp Mech

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Understanding the effect of anisotropy in composite materials on the performance of cruciform specimens

Cited by 6 publications

References 34 publications

Testing Structural Elements under Multiaxial Loading: A Numerical Model of the Bench to Understand and Predict Complex Boundary Conditions

Testing Structural Elements under Multiaxial Loading: A Numerical Model of the Bench to Understand and Predict Complex Boundary Conditions

Advances in Cruciform Biaxial Testing of Fibre-Reinforced Polymers

Optimization on Cruciform Specimen Geometries of AA5052 Under Equi-Biaxial Loading: Acquisition of Ultimate Fracture Strain

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