Skip to main content

research

Generation of Sound (or Ultrasound) Waves & Resonance

Submitted by Babaei on
research
acoustics

Hi,

 

I have a question and would be grateful if you could drop me some lines for it: 

1- Is sound (or ultrasound) is ONLY generated when a structure is vibrating at its resonance frequency?   

2- If the answer to the above question is YES, is sound (or ultrasound) generated at all resonance frequencies or just some of them depending on the amplitude of the vibration. 

 

Thank you,

Babaei

 

3-D crack propagation using 2-D dimensional finite element

Submitted by psubbu2000 on
research
X-FEM
3-D crack
2-D finite element

Dear Friends,

     I have developed a ser of 2-D finite elements for the problems of structural mechanics. These two dimensional elements are capable of accurately predicting three dimensional stress states using three diemnsional constitutive law. My doubt is: can these elements be used for the analysis of 3-D crack propagation using XFEM?.  The displacements chosen for these elements are simple.

 

Subramanian

Multiple-Stripe Lithiation Mechanism of Individual SnO2 Nanowires in a Flooding Geometry

Submitted by Jianyu Huang on
research
in-situ TEM
lithium ion battery
lithiation
multple-strip
nano battery

PRL 106, 248302 (2011)     The atomic scale lithiation mechanism of individual SnO2 nanowires in a flooding geometry was revealed by in situ transmission electron microscopy. The lithiation was initiated by the formation of multiple stripes with a width of a few nanometers parallel to the (020) plane traversing the entire wires, serving as multiple reaction fronts for later stages of lithiation.

Snap-through actuation of thick-wall electroactive balloons

Submitted by Stephan Rudykh on
research
electromechanical instability
snap-through instability
large deformations
EAP
microactuators
micropumps

Snap-through actuation of thick-wall electroactive balloons

Stephan Rudykh (a), (c), Kaushik Bhattacharya  (c) and Gal deBotton (a), (b)

(a) Department of Mechanical Engineering, Ben-Gurion University, 84105 Beer-Sheva, Israel

How to calculate the shear stiffness of a beam

Submitted by Jameswei on
research
Beam
shear stiffness

Lately I began to wonder why I hadn't learned how to calculate the beam shear stiffness in college. I vaguely recalled that the teacher told us the shear stiffness could be omitted in the beam calculation compared to the bending stiffness.

Can anybody show me how to calculate the shear stiffness if it is large enough and cannot be ignored?  Like the example shown in the picture below

 

 

 

Subscribe to research