Mesh objective implementation of a fibre kinking model for damage growth with friction
Artikel i vetenskaplig tidskrift, 2017

A newly developed physically based model for the longitudinal response of laminated fibre-reinforced composites during compressive damage growth is implemented in a Finite Element (FE) software. It is a mesoscale model able to capture the physics of kink-band formation by shear instability, the influence of the matrix in supporting the fibres and the rotation of the fibres during compression, resulting in more abrupt failure for smaller misalignments. The fibre kinking response is obtained by, solving simultaneously for stress equilibrium and strain compatibility in an FE framework. Strain softening creates pathological sensitivity when the mesh is refined. To make the model mesh objective, a methodology based on scaling the strain with the kink-band width is developed. The FE implementation of the current model is detailed with focus on mesh objectivity, and generalized to irregular meshes. The results show that the current model can be used to predict the whole kinking response in a 3D framework and thus account for the correct energy dissipation.

UNIDIRECTIONAL COMPOSITES

CRITERIA

PART II

MECHANISMS

Mesh objectivity

Crushing

REINFORCED COMPOSITES

PROPAGATION

Fibre kinking

COMPRESSIVE FAILURE

Damage mechanics

Friction

Författare

Sergio Costa

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

R. Gutkin

R. Olsson

Composite Structures

0263-8223 (ISSN)

Vol. 168 384-391

Ämneskategorier

Kompositmaterial och -teknik

DOI

10.1016/j.compstruct2017.02.057

Mer information

Skapat

2017-10-08