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parabolic forth order PDE

Submitted by Fattaneh Morsh… on Wed, 10/31/2007 - 05:21

I have advance vibration this term and one of our research homework is to find all solutions that have been presented for parabolic forth order PDE. I am looking for some reference for it. Is there anybody know about it?

resonance (natural) frequency of a cantilever beam

Submitted by Somashekara Bhat on Tue, 10/30/2007 - 10:22

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Microcantilever

resonance (natural) frequency of a cantilever beam is given by

f=[k_n/2pi][sqrt(EI/wL^4)] where, k_n=3.52 for mode 1, E is Young's modulus, I is moment of Inertia, w is beam width, L is beam length. (this is from Formulas for Stress and Strain, 5th edition by Raymond J. Roark and Warren C. Young).

I would like to derive this formula. Can any one suugest me any book or any link?

Mechanical Properties of materials

Submitted by Farzana Husain on Tue, 10/30/2007 - 07:16

education

I need the solution of Problems attached. These probelems are from The CH#3:Mechanical Properties of materials from the book Engineering Mechanics of Materials 7e Hibbeler book

ES 240 (Fall 2007) Lecture Notes - Principle of virtual work and FEM

Submitted by Nanshu Lu on Mon, 10/29/2007 - 15:44

ES 240 notes for Principle of virtual work and FEM. Please see attached.

PHD psychology

Submitted by Anonymous (not verified) on Mon, 10/29/2007 - 07:12

education

Dear sir,

i am from Pakistan . i have done M.Phil psychology. now i want to do PhD from Germany but quite free of cost . can u guide me for that.

regards

kanwal

ES 240 (Fall 2007) Homework 22-25

Submitted by Nanshu Lu on Thu, 10/25/2007 - 18:36

This problem set is due on Nov.2, 2007.

About SIESTA MD Package

Submitted by Apurba Mandal on Thu, 10/25/2007 - 10:59

education

Is there anyboby to help me. Actually I am facing some problem during the use of SIESTA (Spanish Initiative for Electronic Simulations with Thousands of Atoms) package. The problem is that How to generate the Pseudopotential file. And the use of Vibra utility. During the use of Vibra package i cant able to run it properly.

15. Recommend a textbook that you think will help students in this course

Submitted by mingguo on Thu, 10/25/2007 - 02:13

Theory of Elasticity by Landau and Lifshitz.

http://www.amazon.com/Theory-Elasticity-Third-Theoretical-Physics/dp/075062633X

content:

1 fundamental equations

2 the equilibrium of rods and plates

3 elastic waves

4 dislocations

5 thermal conduction and viscosity in solids

6 mechanics of liquid crystals

plane stress problem in abaqus

Submitted by prasadkulkarni on Sun, 10/21/2007 - 19:28

education

hi all!

i am a new user of abaqus. i am trying a simple problem of a plate. the plate is made of composite material (orthotropic). i give all the properties correctly. but after submitting the job i get an error that 'laminate type- can be used with plane stress elemnts only'. how could i rectify this? can anyone tell me how to model a plane stress problem in abaqus? what is the significance of plane stress/strain thickness ratio.