The behaviour of delaminated composite plates under compressive load has been investigated by means of a numerical procedure implemented in the B2000 FEM code. In this work the widely studied delamination growth phenomena in composite plates under compression has been investigated by taking into account also the matrix and fibres breakages until the structural collapse condition is reached. The delamination growth has been simulated by means of interface elements based on the modified virtual crack closure technique (MVCCT) to evaluate the Strain energy Release Rate. Furthermore, an iterative numerical procedure has been introduced to simulate the progressive matrix and fibre breakage by adopting respectively the Hashin’s failure criteria to check the stress state and instantaneous degradation rules for the reduction of the damaged material properties. The penalty method approach has been used for the formulation of the contact phenomena whose introduction in the model is demonstrated to be mandatory when a compressive load is applied to the structure. The developed procedure has been applied for analysing the mechanical behaviour under compression of a delaminated composite plate. The obtained buckling and post-buckling responses have been compared with experimental data on composite coupons with embedded delaminations.
Delamination Growth and Fibre/Matrix Progressive Damage in Composite Plates Under Compression
RICCIO, Aniello;
2008
Abstract
The behaviour of delaminated composite plates under compressive load has been investigated by means of a numerical procedure implemented in the B2000 FEM code. In this work the widely studied delamination growth phenomena in composite plates under compression has been investigated by taking into account also the matrix and fibres breakages until the structural collapse condition is reached. The delamination growth has been simulated by means of interface elements based on the modified virtual crack closure technique (MVCCT) to evaluate the Strain energy Release Rate. Furthermore, an iterative numerical procedure has been introduced to simulate the progressive matrix and fibre breakage by adopting respectively the Hashin’s failure criteria to check the stress state and instantaneous degradation rules for the reduction of the damaged material properties. The penalty method approach has been used for the formulation of the contact phenomena whose introduction in the model is demonstrated to be mandatory when a compressive load is applied to the structure. The developed procedure has been applied for analysing the mechanical behaviour under compression of a delaminated composite plate. The obtained buckling and post-buckling responses have been compared with experimental data on composite coupons with embedded delaminations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
