# tigerofmahdi's blog

Hi Dears

Can any body say what is the difference between impact and shock loading??

thanks a lot

Yavari

## Half Space Problems

Hi Dear

I have a question about half space problems.

When I want to solve a half space problem by utilize a numerical method such as FEM how I should consider the boundary counditions at the infinite bound??

when I want to solve with a analytical method I know it but What I should do for FEM at infinite bound??

## Coupled Thermoelasticity

Hi Dears:

I have a question about coupled thermoelasticity:

Has coupled thermoelasticity written for FGM in 2D until now???

thanks a lot

## Time steps

Hi Dears

I wrote a numerical solution code for 1D diffusion using Isogeometric and alfa method. I have a problem with time steps because when I increase the time steps for a specified length for example 0-0.1 the solution increase too. For example in below fig. blue, red and green lines are for 50, 80 and 100 step time respectively.

Can anybody help me with this problem??

Hi Dears

## Isogeometric

Hi Dears:

what is the solution when the jacobian in IGA Matlab code be zero??

thanks

## Hi Dears

What is the difference between elastic wave and vibration?

thanks.

## Temperature dependent material

Hi Dears and of course metallurgist.

Who person can tell me the relation between the material properties such as Yang modulus, density, thermal coefficient etc. and temperature??

All of properties follow from one relation to temperature? For example if E(T)=Ea+100T then the density and another property have the same relation like P(T)=Pa+100T ??

## Elastic wave propagation

Hi Dears:

Who works on Elastic wave propagation and its reflection? How I can fine the formolations of elastic wave after its reflection from arbitrary boundaries ?? Can you intruducing any refrences to me??

## weighted residual

Hi dears:

why weighted residual is equal to zero ?? why integration of residual multiply by a weight function, over it's domain is equal to zero??

## I need this book.

I need this book highly.

anyone have PDF of this book?

"Impact strength of materials" by W.Johnson

## abaqus scrip

Hi

I run a scrip in apaqus and do'nt need to see the graphical process in window of software and just the output data is essential for me!!

how i can do it ?? what thing i should add to my scrip for recive this idea??

## run scrip in abaqus

hi every body:

mdb.models['Model-1'].parts['Part-1'].SectionAssignment(offset=0.0,

offsetField='', offsetType=MIDDLE_SURFACE, region=Region(

mask=('[#1 ]', ), )), sectionName='Section-3', thicknessAssignment=

FROM_SECTION)

In the up scrip example, how can be define the "mask" for use in getsequencefrommask?