scholarly journals A Technique for Stabilizing Finite Element Simulations of Delamination Propagation in Composite Laminates Using Cohesive Interface Elements

2006 ◽  
Vol 32 (2) ◽  
pp. 67-75 ◽  
Author(s):  
Yutaka ZENBA ◽  
Ning HU ◽  
Hisao FUKUNAGA
Keyword(s):  
Finite Element ◽  
Composite Laminates ◽  
Finite Element Simulations ◽  
Interface Elements ◽  
Cohesive Interface ◽  
Delamination Propagation

COHESIVE FINITE ELEMENT SIMULATIONS OF CONTRACTION AND SHAPE EFFECTS ON CELL DE-ADHESION

2017 ◽  
Vol 17 (06) ◽  
pp. 1750091
Author(s):  
MARGARITA PETROVA ◽  
ZHIWEN GAO ◽  
YAN LIU ◽  
YANFEI GAO ◽  
WEI HE
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Stress Concentration ◽  
Critical Shear Stress ◽  
Finite Element Simulations ◽  
Additional Stress ◽  
Initial Stiffness ◽  
Mode Iii ◽  
Cohesive Interface ◽  
Cell Shapes

Cohesive-interface-based finite element simulations were conducted to investigate the critical shear stress required for cell de-adhesion from extracellular substrates. The interface ligand–receptor bonds are modeled by a cohesive interface model with initial stiffness, interface strength, and fracture energy as the governing parameters. The ratio of the cell modulus to the interface stiffness defines a length scale. If this length is much less than the contact size, the de-adhesion process can be modeled by the linear elastic fracture mechanics, while the opposite limit leads to the concurrent sliding of the cell or, equivalently, debonding of all the interface ligand–receptor pairs. Since it generates additional shear-stress concentration along the interface, cell contraction generally reduces the critical de-adhesion stress. Cell de-adhesion is more prone to take place for three-dimensional irregular cell shapes because of the much easier failure in the anti-plane Mode III shear, as well as the additional stress concentration in these geometric irregularities.

Characterization of delamination-type damages in composite laminates using guided wave visualization and air-coupled ultrasound

2016 ◽  
Vol 16 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Rabi S Panda ◽  
Prabhu Rajagopal ◽  
Krishnan Balasubramaniam
Keyword(s):  
Finite Element ◽  
Composite Laminates ◽  
Three Dimensional ◽  
Guided Wave ◽  
Finite Element Simulations ◽  
Wave Refraction ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Lamb Wave Propagation

This article reports on the characterization of delamination damages in composite laminates using wave visualization method. A combination of plate-guided ultrasound and air-coupled ultrasonics is used to locate and visualize delaminations. The study focuses on the physics of Lamb wave propagation and interaction with delaminations at various through-thickness locations and positions. Three-dimensional finite element simulations are used to study, in detail, the changes in wave features such as mode velocity, wavelength and wave refraction in the delamination region. These wave features provide information on the location, position and orientation of the delamination. These studies are validated by experimental measurements. The influence of position of source and delamination on wave refraction in the delamination region is examined. This method also correlates the results obtained from experiments and finite element simulations to theoretical dispersion curves in order to distinctly determine the delamination location.

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