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How can I get in Abaqus (XFEM) the Griffith' energy release rate G per time increment?

Submitted by havelmay on
ABAQUS XFEM crack propagation; Crack Growth; XFEM; screw

I want to visualize my results of the XFEM crack growth in form of a diagram with the time increments or the crack length on the horizontal axis and the Griffith' energy release rate G or the stress intensity factor K on the vertical axis. I am using the energy-based damage model.

I don't know, where to activate those values in the Output History. The best solution for me is, if the energy release rate G can be transformed into the stress intensity factor.

Can somebody assist me with modelling the crack propagation with XFEM (Abaqus) in connection with contact problems?

Submitted by havelmay on
EXTENDED FINITE ELEMENTS METHOD
Abaqus XFEM
screw

Hello,

I want to arrange a crack propagation in a screw thread. Therefor I use two dimensional axissymmetric elements in Abaqus 6.12-3 (it is the first version, that allows XFEM in axissymmetric models). The boundaries of the screw thread are on the one hand the symmetry axis, on the other hand the contact to a nut thread that is hold in vertical direction. Thus, there are two nonlinear problems: 1.) the contact problem and 2.) the XFEM crack growth.

1.) Arranging the analysis of the contact problem without crack growth works thoroughly.

Faculty Position - UCSB Mechanical Engineering - Assistant Professor - Tenure Track

Submitted by chairasst-me on
job
mechanical engineering
solid mechanics
mechanics of materials
mechanics of structures
biomechanics

FACULTY POSITION

MECHANICAL ENGINEERING

COLLEGE OF ENGINEERING

UNIVERSITY OF CALIFORNIA, SANTA BARBARA

JOB NUMBER JPF00380

 

The Department of Mechanical Engineering at the University of California, Santa Barbara invites applications for a tenure track faculty position at the level of Assistant Professor with a start date of July 1, 2015 or later. 

ABAQUS subroutine for compressible neo-Hookean material

Submitted by Deegayu on
software

Hi everyone, 

 

I am new to ABAQUS software and recently i was trying to implement compressible neo-Hookean material in ABAQUS and for me it is a very difficult task. There are already codes available for the nearly incompressible neo-Hookean material. Since ABAQUS is a widely used software,  i was wondering whether there are any database avaible consisting different codes that we can access. I am desperately looking for a subroutine for compressible neo-Hookean material. Can someone please help me or give me some direction. Thanks a lot !

 

PhD and PDF positions at Oregon State University

Submitted by burkan.isgor@o… on
job
nano-scale
metallic thin films
metal oxides
corrosion
DFT
Ab initio
multi-physics modelling
electron microscopy

We have a number of open positions in our research group that are available immediately. Summary of the positions are provided below; however, for more information about our research group, please visit 

http://web.engr.oregonstate.edu/~isgorb/

Export Mass Matrices in Abaqus

Submitted by augustus on

Hello,

 

I have to export stiffness and mass matrices from Abaqus (dynamical simulation)

and I have been using the commands *Matrix Generate and *Matrix Output

 

I need to export the matrices for different  time points (time intervals) and I have noticed that the entries

of the MASS matrices are not equal at different  time points.

 

Is that correct or should the MASS matrices be constant for a dynamical simulation?

 

many thanks

Micromechanics of collective buckling in CNT turfs

Submitted by Hamid Torabi on
research
finite element modeling
carbon nanotubes
Discrete model
collective behavior
elastica
adhesive contact
buckling

Complex structures consisting of intertwined, nominally vertical carbon nanotubes (CNTs) are called turfs. Under uniform compression experiments, CNT turfs exhibit irreversible collective buckling of a layer preceded by reorientation of CNT segments. Experimentally observed independence of the buckling stress and the buckling wavelength on the turf width suggests the existence of an intrinsic material length.

PhD Positions in computational mechanics at Oklahoma State University

Submitted by Hamed Hatami on
job

PhD Positions in the area of computational mechanics are immediately available in the School of Mechanical and Aerospace Engineering at Oklahoma State University. 

Requirements:

The candidates must have already earned or should soon earn their M.Sc. degree in Mechanical Engineering or in a closely related field.

Strong background in numerical simulations, finite element analysis, and/or computational solid mechanics

Excellent programming skills and experience with high performance computing

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