Blog posts

Michael Brenner has just pointed out to me this video of the Moebius transformations.

I am a abaqus beginer, I want to know how to analyse creep of tubular component in abaqus. If you have any material regarding this kindly mail me. I need it for my project work.

The following link brightened my day quite a bit.  Wikipedia can now be tasted!

http://ourfounder.typepad.com/leblog/2007/10/jimmy-wales-gro.html 

This is the last problem set this semester. It is due on Friday, Dec. 14, 2007.

See attachment for ES 240 lecture notes on plasticity.

Hi

I want to model a composite laminate by shell99 in ANSYS.This laminate is symmetrical about the midplane,so I adjust Layer Symmetry Key(LSYM) to 1 and halve the number of layers. when I compare the maximum deflection of this model with the max deflection of the model with LSYM=0(by inputing total layers) there is a big difference between these two results. It's natural that the results should be the same. I don't know why this error occurs.

I'm teaching Applied Mathematics 105a this semester.  The main content of the course is complex analysis.  The course is taken mainly by undergraduate students in Engineering, Physics, and Applied Mathematics.  There are about 70 people in the class, which makes it the largest class I have taught in the last 10 years. I have never taught a course on complex analysis before, but have used complex analysis in my research, and have taught the method of complex variables in my graduate course on elasticity.

The Lemaitre damage material model was developed by Lemaitre for an isotropic linear elastic virgin material with stress-strain law as follows

 \begin{equation}

 \label{eq:22}

 \sigma_{ij}=(1-D)C_{ijkl}\epsilon_{kl} \quad D\in[0,1]

 \end{equation}

 where $D$ represents the extent of damage with the damage evolution law

\begin{equation}

\label{eq:23}

D(\bar{\epsilon})=1-(1-A)\epsilon_{D_{0}}\bar{\epsilon}^{-1}-Ae^{-B(\bar{\epsilon}-\epsilon_{D_{0}})}

\end{equation}