This work explores the postbuckling behavior of a marine stiffened composite plate in presence initial imperfections. The imperfection shapes are derived from buckling mode and their combinations. Thereafter, these applied to model, nonlinear large deflection finite element progressive failure analyses performed ANSYS 18.2 software. Hashin criterion is employed model plate. effect geometric on ...

A continuum damage mechanics (CDM) meso-model was derived for both intraply and interply progressive failure behaviors of a 2D woven-fabric composite laminate under a transversely low velocity impact. An in-plane anisotropic damage constitutive model of a 2D woven composite ply was derived based on CDM within a thermodynamic framework, an elastic constitutive model with damage for the fibre dir...

In this presentation, the structural performance of fiber reinforced composite laminate Pi joints is studied through a progressive failure analysis (PFA) method. The bonded joint area that is the weakest link of the Pi joint structure is modeled using the discrete cohesive zone method (DCZM). The damage growth and failure of the bonded interface is modeled through an exponential decaying tracti...

With advanced composites increasing replacing traditional metallic materials, the material inhomogeneity and inherent anisotropy of such materials lead to not only new attributes for aerospace structures, but also introduce new technology to damage tolerant design and analysis. The deleterious effects of changes in material properties and initiation and growth of structural damage must be addre...

conclusions although our patient had ckd stage 4, but his condition has not deteriorated and remained constant and stable for several years only by control of blood pressure and usual treatment which prescribed for patients at this stage case presentation a 78-year-old man presented with stage 4 ckd for 7 years; the glomerular filtration rate (gfr) and creatinine levels remained constant despit...

alport syndrome is a progressive hereditary nephritis leading to renal failure. nearly all of the documents declare that alport syndrome is inherited as x-linked dominant trait and reports of autosomal inheritance form is very rare. this paper presents an iranian large alport family with autosomal recessive inheritance. in our patients alport disease was confirmed with electron microscopic stud...