# education

## Modal Frequencies

Hi All

How to find the modal frequencies of a wind turbine blade,

-Ravi Talawar

## how to show the stress in the thickness direction when you use the shell element with abaqus

hello,

•      i simulate some process using shell elment, i find the results have big difference between abaqus and lsdyna. the abaqus results always show the stress in the thickness direction is zero. but the lsdyna is not. i don't know why? if some one know that, please give me some suggestions. i heard that the abaqus can not show that stress component. if not, how can i do to calculate that and fill it into the results file (.fil file). thank you!

## Problem with my Abaqus Double Layer Composite Identation Simulation

Choose a channel featured in the header of iMechanica:

Hi everyone,

I currently using Abaqus/CAE 6.8. I currently doing my final year
project about indentation test on double layer composite material. The
top layer of the material is Pasta (elastic) and bottom layer is Gel
(hyperelastic). I manage to simulate the model and completed the
process. The stress of the Gel does not change as it undergoes
deformation. As shown in the clip i attached. Any idea to solve this
problem? Any suggestion is welcomed.. Thanks

Right click the indentation.jpg and save target as....

## Impact analysis of bus body-ansys ls dyna

I am a  B.Tech student at VIT.Presently doing a project on Impact analysis of Bus body using ansys ls dyna.I am getting many errors.If any one is having complete tuturial about above topic, pls send it to me.

## Student

Hi,

I am facing some problem in ABAQUS. How can i use Vumat subroutine and how can i findout sresses.Please help me

## Nonlinear Analysis

Hello,In order to nurture you in an effective manner regarding the Newton-Raphson method I recommend you to consult the excellent treatise of I. M. Smith et al. entitled "Numerical Methods for Engineers ", ISBN-13: 9781584884019.Furthermore this method is elegantly elaborated in Finite Element Formulation in the outstanding book of I. M.

## Detonation &knocking

hello dosto,

i am studying in B-tech 2nd year (mech.) in DCE . I want to know  about detonation and knocking of fuels in detail.

thank you

shankar Gupta

## Help Regarding PhD opportunities

Hi Suo and other guys,

I am Chennakesava. I am new to this site. I have completed my Masters in Mechanical Engineering from Indian Institute of Technology, Kanpur, India. (IITK) . Year of study is 2006-08. My specialization is Solid Mechanics & Design. Right now am working in GE, India. I want to pursue doctoral degree in the field of Dynamics and Vibrations and related issues like, Rotor dynamics, Smart structures, MEMS, Nonlinear dynamics and Chaos. Its kind of a dream to me.

## Query on transformation representing deformation fo space , change of basis and orthogonal nature

Hello All
I am trying to read the text book Tensor analysis by IS Sokolnikoff and stuck in
chaper 1, there is some confusion in my mind regarding orthogonal transformations,
change of basis and and a transformation representing deformation of space.
Please bear with me if my confusions are unfounded.
1) Is is safe to say that transformation representing deformation of space acts on
vectors where as transformations representing the change of basis acts on
components?. (if yes then the following questions are resolved and need not be
looked)
2) Sokolnikoff builds up the reasoning for orthogonal transformations based on
deformation of space (i.e orthogonal transofrmations keep the length of vector

## Strain Energy Derivation

Dear Sirs,

I'm trying to derive an strain energy in a small volume 2a x 2b x 2t.

I can derive "The rest terms are ommited" by myself .

By the way, I can't derive the DT2 term in the 2nd row of the figure.

Thanks,

Jin Kim

## Modeling bone and implant

I'm working with multiple meshed items and attempting to cut them using the Instance boolean operation. My parts include parts I've sketched & meshed in Abaqus and a 3D object I imported from MIMICS (.inp file). When I attempt to selectively cut the instances that overlap, Abaqus failed. Any suggestions on the modeling of bone and implant with a reasonable fit in geometry?

## Composites modeling

Hi i want to model a compsoite shaft of glass/epoxy .i am having all material properties .i want to know how to model it .and in another case there is adhesives between the two.

Thanks,

pankaj

## suggestion on a project.............

hii every one ... i am an  undergraduate student in mechanical enggineering . can any 1 suggest me a good project which includes  1.both computer oriented and also lab oriented project.

2.  also a  project in fatigue analysis.