In this paper, a novel finite element tool, for the simulation of delamination growth in Non-Crimp fabric (NCF) composite materials, is presented. The proposed finite element tool is based on the implementation of the Stiffness Averaging Method, the Modified Virtual Crack Closure Technique and the Penalty Method in the research oriented B2000 FEM code. The Stiffness Averaging Method allows taking into account the effects of the processing variables, characterizing the Representative Volume Element (RVE) of the NCFs, on their mechanical performances. The Modified Virtual Crack Closure Technique is used to determine the Energy Release Rate for the delamination growth simulation. Double Cantilever Beam (DCB) tests, used to determine the Mode I fracture toughness, have been considered for validation purposes. DCB tests have been simulated by means of non-linear analyses and compared in terms of deformed shapes and load-displacement curves with relevant experimental data. Moreover, the ability of the developed tool to take into account the NCF performances variability with processing parameters together with the delamination growth has been assessed and critically discussed.
A B2000 BASED NUMERICAL TOOL FOR THE SIMULATION OF NON-CRIMP FABRIC COMPOSITES: MECHANICAL PERFORMANCES AND DELAMINATION GROWTH
RICCIO, Aniello;
2005
Abstract
In this paper, a novel finite element tool, for the simulation of delamination growth in Non-Crimp fabric (NCF) composite materials, is presented. The proposed finite element tool is based on the implementation of the Stiffness Averaging Method, the Modified Virtual Crack Closure Technique and the Penalty Method in the research oriented B2000 FEM code. The Stiffness Averaging Method allows taking into account the effects of the processing variables, characterizing the Representative Volume Element (RVE) of the NCFs, on their mechanical performances. The Modified Virtual Crack Closure Technique is used to determine the Energy Release Rate for the delamination growth simulation. Double Cantilever Beam (DCB) tests, used to determine the Mode I fracture toughness, have been considered for validation purposes. DCB tests have been simulated by means of non-linear analyses and compared in terms of deformed shapes and load-displacement curves with relevant experimental data. Moreover, the ability of the developed tool to take into account the NCF performances variability with processing parameters together with the delamination growth has been assessed and critically discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
