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The effects of edge cracks on the natural frequencies of cracked cantilever beams have been extensively studied by Wendtland (1972). These results are referred to by quite a number of related journal papers; the refernce is:

Wendtland D. A¨ nderung der biegeegenfrequenzen einer idealisierten Schaufel durch Risse. Ph.D. Dissertation, University of Karlsruhe; 1972.

Does anyone know how this can be accessed online, or atleast the complete set of results for eigenfrequency (first three modes of vibration) changes due to edge cracks at different positions and depths?

There is a Post doctoral Position available with my supervisor Prof.Sridhar Idapalapati.  The candidate should have PhD degree with background in  impact mechanics, fracture mechanics and exposure to finite element modeling packages such as AUTODYN software. Exposure (handson) to drop tests or Hopkinson bar tests is an added advantage.

If u are interested plz contact him directly @ msridhar [at] ntu.edu.sg

Hello Everyone,

Could you address me to a comprehensive description for relationship between fatigue and fracture  in prediction life Fatigue crack growth life?

i appreciate in advance,

Hi everyone,

My coworkers (Dan Gianola, Yixiang Gan, and Kevin Hemker) and I have published research results in the December 18th, 2009 issue of Science.  In this work, we perform tension tests on specially designed thin film samples to studying the influence of different stress and strain states on mechanically-induced grain growth in nanocrystalline aluminum.  Our results indicate that shear stresses drive grain boundaries to move in a manner consistent with recent molecular dynamics simulations and theoretical predictions of coupled grain boundary migration.