Skip to main content

research

When Newmark Misses!

Submitted by ADINA Support on

                         Accurate Implicit Time Integration in Nonlinear Dynamic Analysis

Using an effective time marching procedure is an important aspect in the implicit finite element analysis

of nonlinear dynamic problems. Here, we demonstrate some of the difficulties that can arise through an

example involving contact chatter and fluid structure interaction:

The "Goldilocks" Effect in Fossilized Dinosaur Trackways

Submitted by Lee Margetts on

The following paper is now online:

Falkingham P.L., Bates K.T., Margetts L. and Manning P.L. (2011) "The
'Goldilocks' effect: Presevational bias in vertebrate track
assemblages", Journal of the Royal Society Interface

See: http://rsif.royalsocietypublishing.org/content/early/2011/01/12/rsif.20…

Authors welcome any comments for future studies!

Defining general contact in axisymmetric analysis with share node cohesive elements

Submitted by prabhat on

Dear All,

I am am using share node cohesive element in axisymmetric analysis. I want to use friction between two joined blocks when cohesive elements break. I tried this with using general contact definition in Abaqus 6.8. To do so, I am defining element based surface but while running the simulation the abaqus gives following error:

***ERROR: *CONTACT currently does not support the use of 2D surfaces.

 Can anyone help to find out what can be wrong with my surface definition.

With regards and best wishes,

Prabhat

Cardboard rolls on the nanoscale

Submitted by Peter Cendula on

Everybody knows that cardboard paper can be a highly
anisotropic material. You can easily bend or roll it in one direction
and it is stiff in the other. If you take a close look you will find
that the paper is periodically buckled along one direction. We have now
exploited this phenomenon on the nanoscale to define the roll-up
direction of ultra-thin membranes on a substrate surface.

Y.C. FUNG STUDENT PAPER COMPETITION ON BIOMECHANICS AND BIOPHYSICS

Submitted by shaofanli on

Dear Colleagues,

 

Please distribute the following annoucement to your graduate students,

and first year post-doc researchers.

 The deadline for submission is January 15th, 2011.

 

Happy New Year !

-------------------------------------------------------

 

Dear Colleagues,
We are glad to announce that the Biomechanics Committee of the Engineering Mechanics Institute (EMI) of the American Society of Civil Engineers (ASCE) has established a
best student competition:
Y.C. FUNG STUDENT PAPER COMPETITION ON BIOMECHANICS AND BIOPHYSICS

Warnings in nanoindentation simulation

Submitted by weidongli on

Hi all,



     I am using abaqus to model a nanoindentatin problem and always meet some
warnings. There are generally three types of warnings, as shown below.

Is there anyone who know how to resolve this kinds of problem. I have
been struggling to this problem for a couple of days.  So, you help will 
be highly appreciated.



    ***WARNING: THE REFERENCE NODE 1 (ASSEMBLY) IS PART OF THE CONNECTIVITY OF

Bonding of Soft and Rigid Materials

Submitted by kvm7 on
Choose a channel featured in the header of iMechanica

I am workingon a model in which i have a soft layer of material bonded between to rigidlayers of material via cohesive elements following a linear separation-tractionlaw based on a critical fracture energy value I determined from experimentaland numerical work. I have the interlayer and cohesive elements as one partwith a partitioned face and connected to the two adherends viasurface-to-surface ties. I have found that my model runs successfully only ifthe soft interlayer material is made very stiff.