An extension of the point-stress criterion based on a coupled stress and energy fulfilment

Martín, E.; Leguillon, Dominique; Carrère, Nicolas

doi:10.1016/b978-0-08-100137-0.00017-1

Structural Integrity and Durability of Advanced Composites 2015

DOI: 10.1016/b978-0-08-100137-0.00017-1

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An extension of the point-stress criterion based on a coupled stress and energy fulfilment

E. Martín

Dominique Leguillon²,

Nicolas Carrère

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Cited by 2 publications

(1 citation statement)

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“…Experimental models [6][7][8][9] that model the tensile strength of open-hole specimens with empirical formulations based on the observed failures. Full-field strain analysis was employed in [10,11]; • Numerical models that describe the complexity of the problem, accounting for different damage models describing the interaction of failure modes (e.g., delamination, inplane cracking) [12][13][14][15][16][17][18][19][20] or advanced finite element methods [21,22];…”

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confidence: 99%

A Statistical Mesoscale Approach to Model the Size Effect on the Tensile Strength of Notched Woven Composites

Ferrarese,

Boursier Niutta,

Ciampaglia

et al. 2024

Applied Sciences

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The scaling of the strength of composite parts with part size is referred to as the size effect. In the presence of notches, stress concentration affects a portion of material that increases with the notch size. Furthermore, in woven composites, the notch and tow size can be comparable, thus demanding a mesoscale approach to properly capture the stress intensification. In this paper, a probabilistic mesoscale method to model the size effect in notched woven composites is presented. First, the stress distribution is estimated with a finite element model, calibrated on experimental Digital Image Correlation data. The FE model simulates the mesoscale heterogeneity of the woven reinforced material and replicates the local stress intensification at the tow level. Then, a three-parameter Weibull-based statistical model is introduced to model the probability of failure from the calculated stress distribution and the volume of the part. An equivalent stress is used to capture the relevant fiber and matrix failure modes and the maximum value within the specimen volume is the random variable of the model. The method is applied to open-hole tension tests of a woven twill carbon fiber–epoxy composite. Two specimen widths and three width-to-diameter ratios, from 3 to 12, are considered. Specimen width produced an observable size effect, whereas the variation of hole size in the range considered did not. The statistical model is found to accurately describe the experimental observations, efficiently replicating an inverse size effect, regardless of hole size, while wider specimens lead to a lower probability of failure.

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mentioning

confidence: 99%

A Statistical Mesoscale Approach to Model the Size Effect on the Tensile Strength of Notched Woven Composites

Ferrarese,

Boursier Niutta,

Ciampaglia

et al. 2024

Applied Sciences

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Open-Hole Tensile Experiments of Thermoplastic Composite Laminates and Finite Element Analysis

Özer¹,

Kurtuluş²,

Güçlü³

et al. 2017

International Journal of Computational and Experimental Science and Engineering

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Composites materials are used in automotive industry for their light weight and high strength properties. With the progress signed in a new polymer matrix, recyclable thermoplastic composite (TPC) materials, became an excellent alternative to conventional materials. In this paper glass fiber reinforced TPC materials manufactured with lamina sequence techniques of polyamide, polypropylene matrix materials were used to realize open hole tensile tests. Finite Element Analysis (FEA) were also performed by using commercial software. The open-hole tensile tests results were compared with standard tensile tests results to clarify circular hole influence on the stress-strain behavior of the TPC materials. FEA results were also compared with the experimental data.

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An extension of the point-stress criterion based on a coupled stress and energy fulfilment

Cited by 2 publications

References 36 publications

A Statistical Mesoscale Approach to Model the Size Effect on the Tensile Strength of Notched Woven Composites

A Statistical Mesoscale Approach to Model the Size Effect on the Tensile Strength of Notched Woven Composites

Open-Hole Tensile Experiments of Thermoplastic Composite Laminates and Finite Element Analysis

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