Compressive failure and kink-band formation modeling
Artikel i vetenskaplig tidskrift, 2023

To increase the use of polymeric structural composites, a major issue is to properly account for intra-laminar failure mechanisms, such as fiber kinking induced under compression. We propose a new continuum damage model that can predict the fiber kinking response at the ply level. The model is based on a previous structure tensor-based model for the response of UD-plies. A novel feature is that the compressive UD-ply response at the macroscale includes the effect of the fiber misalignment shaped as a kink-band that is resolved at the sub-scale. Concepts of computational homogenization are used to include the fiber-shear of the kink-band at the sub-scale. The model calibration is adapted to account for either kink-band formation or shear-splitting depending on the off-axis loading. Finally, the model is validated at the laminate level against experimental data for OHC-tests available in the literature. A good agreement is found for predicted strength values and observed fracture patterns of the laminates. The size effect experienced when different hole sizes are tested is also addressed.

Non-local damage

Fiber kinking

Composites

Homogenization

Continuum damage

Författare

Ragnar Larsson

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Giovanni Brambati

Politecnico di Milano

Renaud Gutkin

Volvo Group

Chalmers, Industri- och materialvetenskap

European Journal of Mechanics, A/Solids

0997-7538 (ISSN)

Vol. 99 104909

Ämneskategorier (SSIF 2011)

Teknisk mekanik

Bioinformatik (beräkningsbiologi)

Kompositmaterial och -teknik

Styrkeområden

Materialvetenskap

DOI

10.1016/j.euromechsol.2023.104909

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Senast uppdaterat

2025-02-04