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Journal club theme of Aug. 15, 2008: Variational formulations in fracture mechanics

Submitted by Adrian Lew on

This issue of the journal club addresses a topic deemed classical by most mechanicians: the onset and evolution of fracture in brittle solids.  In the last ten years or so a community of mathematicians have been analyzing the formulation of fracture mechanics models.  Although still at a very early stage, there is already a substantial body of work, which either sets in a very rigorous settings some known results, or give rise to other perhaps more surprising ones.

Measurements of near-ultimate strength for multiwalled carbon nanotubes and irradiation-induced crosslinking improvements

Submitted by Horacio Espinosa on
research
MEMS
NEMS
carbon nanotubes
electron microscopy

For more than 15 years, carbon nanotubes (CNTs) have been the flagship material of nanotechnology. Researchers have conceived applications for nanotubes ranging from microelectronic devices to cancer therapy. Their atomic structure should, in theory, give them mechanical and electrical properties far superior to most common materials.  

Illegal floating point operation

Submitted by gautambalaram on
software
ABAQUS
floating point
error

Can anyone shed some light on this particular error?

ABAQUS Error: The executable /app2/6.6-1/exec/standard.exe

aborted with system error "Illegal floating point operation" (signal 8).

Is there a possible reason for this error as I have gone through my code many times and dont find any suspicious statements that could lead to this error.  

This occured when I was running my analysis with a USDFLD and MPC subroutine

Using User Subroutine UMAT in abaqus

Submitted by sanjay2008 on
research

Hi,

Iam a new user of abaqus. I have a subroutine written in *.for format. I also have an input file *.inp . Both these programs are in the same folder. When I try to execute the *.inp file using the command

abaqus job=jobname datacheck interactive

I get a  message saying  "Abaqus/Standard Analysis exited with an error. please see the message file for possible error messages". I looked in the message file and it says ***ERROR: USER SUBROUTINE UMAT IS MISSING.

Then I used the command

abaqus job=jobname user=umat.for

Comparison - mechanics research in Europe and in America

Submitted by kwlim on

Can anyone shed some light on the differences in terms of mechanics research here in the US and in Europe? Is it true that larger scale research is done here in the US there's more funding opportunities here?  How do you compare the two? What about difference in terms of research focus and topics?

5th IC on Fracture of Polymers, Composites and Adhesives - just 4 weeks to go!

Submitted by Dean Eastbury on
conference
fracture mechanics
polymers
Composites
adhesives

The 5th International Conference on Fracture of Polymers, Composites and Adhesives will be held in the beautiful Alpine village of Les Diablerets, Switzerland, 7-11 September. Les Diablerets is situated 120 km from Geneva's international airport and is easily reached either by car or by public transport.

The full oral and poster programs, as well as registration details can be found on the conference website at www.tc4pca.elsevier.com

Failure criteria in composites materials

Submitted by Evandro S. Silva on

Hi all,

I would like to know how I put failure criteria in Ansys. I tried put in General Postproc --> failure criteria --> Add/Edit (FC datas), but the results always fail. I am modeling a simple plate, displacement on left side (all DOF) and applaying a pressure in the other side. Does somebody know how I can do this?

Thanks in advance

Silva

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