education

I have always, and I believe correctly, considered cohesize/bridging models linear elasticity. This is because whether we apply them to holes or cracks, we are solving the equations of ELASTICITY, with nonlinear boundary conditions along the part(s) of the crack along which a traction-separation law is applied. So the material model is totally elastic. All we did was to augment the elasticity theory with an ad hoc physical condition (inspired by experiments such as Dugdale).

If a car filled with water is accelerated at uniform rate, and a heavy object is hanged by a string from the top of the car and a balloon with a string from the bottom of the car. What would be the direction of deflection of balloon & the heavy object. I would appreciate if someone could explain to me the phenomena of deflection, which would be helpful for me to better understand the topic please.

Dear All,

 I think that many students are looking for some tutorials about writing a UMAT in ABAQUS.

You can find a comprehensive tutorial for elastic problems.

This file contains: 

• Motivation

• Steps Required in Writing a UMAT or VUMAT

• UMAT Interface

• Examples

Example 1: UMAT for Isotropic Isothermal Elasticity

Example 2: UMAT for Non-Isothermal Elasticity

Can someone help me to understand this please:

The stretching tensor (D) is the symmetric part of the velocity gradient (L), and if I derive D from L with using the polar decomposition of the deformation gradient (F=RU) I get the relation:

D=0.5 R (Udot Uinv + Uinv Udot) R' ----(Eq.1) where Udot is the time derivative of U, Uinv is the inverse of U, and the prime indicates the tranpose of the matrix.

I am refering to the book - Mechanics of Materials by Beer, Johnston and DeWolf (McGraw-Hill) topic 8.2.

When we design a wide-flange beam, we must consider two conditions. First, the shear stress at the maximum shear section must not exceed the allowable shear stress. Second, the principal stress at the junction of the web and the flange at the section of the maximum moment must also be compared to the allowable normal stress. This is straightforward and clear to me.

Please take notice of the 

International, interdisciplinary, and bilingual

Master of Science Programme „Computational Sciences in Engineering (CSE)“

at the Technische Universitaet Braunschweig in Germany.

http://www.tu-braunschweig.de/cse

I finished the grad course on Mechanics of Soft Materials. It took 14 weeks with 2 academic hours per week and it covered the following topics: 1 Tensors 2 Kinematics 3 Balance laws 4 Isotropic elasticity 5 Anisotropic elasticity 6 Viscoelasticity 7 Chemo-mechanical coupling 8 Electro-mechanical coupling.

I attach the class notes and I will be grateful for the remarks, corrections, and criticism from iMechanicians.

A Summer School on Fracture will be held at the Institut d’Etudes Scientifiques de Cargese, in Cargese, from June 7 to June 18, 2010. This is jointly organized by Elisabeth Bouchaud, CEA Saclay and Krishnaswamy Ravi-Chandar, University of Texas at Austin. Details of the School can be found at http://www.ae.utexas.edu/SummerSchoolFracture/ 

Hi,

I'm an Engineer and a Ph.D. student in Applied Maths, working in the field of Nonlinear Finite Elements for Elasticity. I often think about my future career since, by now, I have a strong experience with coding FE in C++/Matlab/Mathematica, but no clue whatsoever about commercial black-box softwares for FEA. I'm worried about this, since most of the job vacancies from the industry (I'm not interested in pursuing the Academic career) seem to require only experience with a specific software and application, and not to directly code FE.

Hi,

I am doing some test on the fracture toughness.

I am wondering if in Linear Elastic Fracture Mechanics, Fracture toughness of the material is equal to fracture energy or not?

Can anybody send me an naswer,

Thank you,

Manooir

dear Friend

I am comparing italian universities with Russian ones with US and with Cuban ones. Then I need some figures.

I have been able for example to find that there are about 50% of students-workers in Russia, what about US?
I mean full time workers, not just part time.

I’ve just come back from a Winter School on Dielectric Elastomer Transducers, held at Monte Verità, Ascona, Switzerland, 10-16 January 2010.  Lectures were given by various people, covering the theory of electromechanical interaction, design of devices, development of materials, and technologies of manufacturing.  I was asked to give three lectures on the theory.  I attach the slides of my lectures.

NSF Summer Institute Short Course on

Mechanics of Soft Materials

Co-sponsored by
The Intrenational Union of Theoretical & Applied Mechanics (IUTAM) and
The US National Committee of Theoretical and Applied Mechanics (US/NCTAM)

Organizers: Yonggang Huang and Wing Kim Liu, Northwestern University

Hilton Garden Inn, 1818 Maple Avenue, Evanston, Illinois, 60201
Dates: May 10 (Monday) morning to May 12 (Wednesday) morning 2010