Blog posts

Natural Frequency Extraction in conjunction with UMAT in ABAQUS

Submitted by Vaibhav Yadav on Thu, 01/06/2011 - 23:13

Hi,

We are using the user subroutine UMAT in ABAQUS for varying the material properties in a thin plate. For any static analysis this subroutine is working perfectly fine. However, while using UMAT during natural frequency extraction, ABAQUS is not completing the analysis and is giving a very vague following error message in the log file:

Postdoctoral Research Associate Positionon Acoustic Metamaterials

Submitted by cai@ksu.edu on Thu, 01/06/2011 - 20:31

job

The Department of Mechanical and Nuclear Engineering at Kansas State University invites applications for a postdoctoral research associate position. The primary responsibility of the position is to conduct research on sonic crystals and acoustic metamaterials. The position is supported by an externally funded project by the federal government. The position is temporary appointment initially set for one year, and renewable contingent upon the performance and funding availability. The expected starting date is January 15, 2011. Required qualifications include: an earned Ph.D.

Finite Element Modeling On Polymer Nanocomposite with Clay Nanofiller

Submitted by ANIL KUMAR on Thu, 01/06/2011 - 18:00

research

interface

mechanical properties

stiffness

I'm doing Mtech project on Finite Element Modeling On Polymer Nanocomposite with Clay Nanofiller. For that am using ABAQUS software, so i need some information regarding that ABAQUS software, how to do finite element modeling of nanocomposites with nanofiller and How to prepare a code distrubution in the plate like particales in the polymer matrix with ABAQUS software. So please can any give information.

How to teach thermodynamics

Submitted by Libb Thims on Thu, 01/06/2011 - 14:32

thermodynamics

engineering thermodynamics

chemical thermodynamics

bioengineering thermodynamics

Influence of surface irregularities during rolling contact

Submitted by rajesh science on Thu, 01/06/2011 - 11:13

Hi all,

A smooth cylinder in contact with a cylinder that is fitted with one of two irregularities: a 0.4 μm deep groove, or a 7 μm deep groove. the materials are hardened bearing steel and the 440C grade. how to calculate contact pressure distribution Hertzian pressure for contact with the grooved and smooth surface.

Looking for your valuable suggestions,directions.

which is a good book would give answer for the present problem?

Thanks in advance,

Rajesh

Acta Mechanica Solida Sinica, Vol 23 issue 6 online now

Submitted by C Amss on Thu, 01/06/2011 - 02:31

research

Home Page Editorial Board Submit an Article

How to write an input ABAQUS file containing UMAT and USDFLD together

Submitted by Mehdi Naderi on Wed, 01/05/2011 - 22:09

education

Hi everyone,

I am trying to model composite failure in abaqus. I used USDFLD to check different failure mode (fiber tension/compression, matrix tension/compression,..) based on available theory of failure. After checking the failure, if any element fails, the material property like stiffness will suddenly reduces to near zero. At this time i need to chnage material stiffness in UMAT and getting new stress distribution.

My problem is in the input file (inp file) how can I use both command for USDFLD and UMAT?

Here is a part of my input file:

Post-doc in micromechanical testing at Oak Ridge National Laboratory

Submitted by Amit Shyam on Wed, 01/05/2011 - 17:32

Thin Film Mechanical Properties

solid oxide fuel cells

Micromechanical testing

We have an immediate opening for a post-doctoral candidate in the area of micromechanical testing within the Mechanical Properties and Mechanics group at ORNL. Please see the attached file for further details. If you are interested in the position, please apply online at:

https://www2.orau.gov/ORNL_POST/.