Crack modeling of metal rod eigen-frequencies

Calculation of Buckling Load and Eigen Frequencies for Planar Truss Structures with Multi-Symmetry

In this paper, the region in which the structural system is situated is divided into four subregions, namely upper, lower, left and right subregions. The stiffness matrix of the entire system is then formed and using the existing direct symmetry and reverse symmetry, the relationships between the entries of the matrix are established. Examples are included to illustrate the steps of the method.

The resonant frequencies of rod and cone electroretinograms

The ERG of the albino rat and the gray squirrel was studied with sinusoidally flickering light and D.C. amplification. It was found that: The rat's ERG has a resonant frequency of 2 to 4 c.p.s. with attenuation at both lower and higher frequencies; the bandwidth of the response extends from 0.05 to 25 c.p.s. The squirrel's ERG has a resonant frequency of 9 to 10 c.p.s. xoiih a bandwidth of appr...

A numerical investigation into the crack effects on the natural frequencies of the plates

In the current study, the effect of such parameters as the length, position and angle of crack on free vibrations of a cracked plate was examined by finite element method. The assumed crack was internal and through and its growth was ignored. In the proposed finite element model, crack was considered as a discontinuity on the plate surface and the results were compared with the results of other...

3D Modeling and Design Optimization of Rod Shaped Ionic Polymer Metal Composite Actuator

On Crack Arrest in Ceramic / Metal Assemblies

Brittle parts of ceramic/metal assemblies are subjected to a residual stress field generated by the fabrication. During that process, cracks are initiated and the key question is whether they propagate through the whole brittle part. The use of classical probabilistic fracture models applied to the ceramic (i.e., based on a weakest link hypothesis), allow one to conclude that cracks are likely ...