Numerical Determination of Delamination Onset in Laminated Symmetric DCB Specimen

Fracture Behavior of Multidirectional DCB Specimen: Higher-Order Beam Theories

Mathematical models, for the stress analysis of symmetric multidirectional double cantilever beam DCB specimen using classical beam theory, first and higher-order shear deformation beam theories, have been developed to determine the Mode I strain energy release rate SERR for symmetric multidirectional composites. The SERR has been calculated using the compliance approach. In the present study, ...

Finite Element Simulation of Fast Fracture in Steel Dcb Specimen

Abstract--Results of a numerical simulation, based on an energy consistent moving singularity dynamic finite element procedure, of fast crack propagation and arrest in a high strength steel DCB specimen are presented. The influence of material properties of high strength steel on dynamic crack propagation and arrest is investigated. The influence of the loss of constact of specimen with the loa...

A Numerical and Experimental Investigation on Delamination Buckling Behavior in Laminated Composites under Compressive Load

Introducing a Specimen of Annular Pancreas (with late-onset Symptoms)

Annular pancreas is a relatively rare congenital diseasecaused by an embryologica1and anatomical disturbance in pancreas It may have no sympforns throughout the life and so occasionally discovered during an unrelevant surgery or autopsy but in most of the cases it shows itself as a duodenal obstruction during the in­fancy and childhood.Very rarely symptoms of the disease my be obser­ved in adul...

Finite Element Modeling of Delamination Crack Propagation in Laminated Composites

Finite element analysis of the delamination crack propagation in laminated composites is presented. Fracture mechanics based Virtual Crack Closure Technique (VCCT), and the cohesive element technique, have been used to simulate the delamination initiation and propagation under Mode-I type loading. Detailed description of the parameter selection process for these two techniques with ABAQUS®/Stan...

Fast Numerical Determination of Symmetric Sparsity Patterns

We consider a function g : < n ! < n for which the Jacobian is symmetric and sparse. Such functions often arise, for instance, in numerical optimization, where g is the gradient of some objective function f so that the Jacobian of g is the Hessian of f. In many such applications one can generate extremely eecient algorithms by taking advantage of the sparsity structure of the problem if this pa...