Acoustic properties of the metamaterial graded absorber, also known as ``acoustic black hole'', are studied in linear regime. The absorber consists thin metallic circular plates, each with a central perforation, separated by annular air cavities. Radius perforation plate is gradually decreasing distance from to front surface, forming channel staircase radius profile. A semi-analytical equivalen...

A Study of Annular Slurry Jet for Abrasive Waterjet Cutting

This paper deals with the nonlinear free vibration of thick annular functionally graded material plates. The thickness is assumed to be constant. Material properties are assumed to be graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituents. The formulations are based on the first-order shear deformation plate theory and...

abstract annular pancreas (ap) is a rare congenital malformation resulting from failure of pancreas ventral anlage rotation with the duodenum. this leads to a ring of pancreatic tissue that envelops the duodenum. clinical manifestations of ap most commonly develop in infancy or early childhood but can present at any age. the diagnosis of ap, usually suggested by an upper gi series or abdominal ...

Plastic failure of thick axisymmetric plates obeying Mises yield criterion is theoretically investigated. Upper and lower bounds for loci under the combination bi-directional bending moments a shear force are formulated explicitly, they found very close in size as well shape. The theoretical results applied to annular subjected uniform line loads along circular edges, some numerical solutions d...

An analytical approximate solution is developed for predicting the thermal resistance of bolted joints between two square plates . of the same material but different thicknesses. The plates are assumed to have perfectly flat and smooth surfaces, and they are joined by a bolted connection at the center of the square, forming a concentric annular contact region at the interface. The entire surfac...

In this paper, nonlinear bending analysis of bilayer orthotropic annular/circular graphene sheets is studied based on the nonlocal elasticity theory. The equilibrium equations are derived in terms of generalized displacements and rotations considering the first-order Shear deformation theory (FSDT). The nonlinear governing equations are solved using the differential quadrature method (DQM) whic...