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Abaqus:warning message,Tangent directions used to enforced contact constraints for contact pair

Submitted by Marko_carl on
ABAQUS/CAE

Well I tried to search for a related thread and could not find one, so creating a new
one. But if such a thread exists, please direct me there, thank you. I
am trying to define the contact between two gears and it worked
perfectly before without Substrcture. But I receive a warning when I use
usbstructures. I do not want go into much details because I do not want
to confuse anyone. I wish to have answer only for following question:

Announcing Wear of Materials 2015 - Website has just gone live

Submitted by TanjaLeijs on
conference
materials science
friction
wear
coatings
coating failure
surface engineering

20th International Conference on Wear of Materials

12-16 April 2015

The Sheraton Centre, Toronto, Canada

The 20th International Conference on Wear of Materials will focus on both the fundamental and applied aspects of wear and friction of materials at the macro-, micro-, and nano-scale. It will address the understanding of tribological phenomena; particularly the progress in recent decades and a special session will concentrate on modeling of wear.

Paper: On finding cohesive law parameters for foam-metal interfaces

Submitted by Biswajit Banerjee on
research
experiments
cohesive zone
interface crack
polyurethane foam
galvanized steel

A detailed report of our work on trying to find cohesive laws for interfacial fracture is attached.  I will add the experimental data after a shorter version of this report has been published.

The reason for posting this report on iMechanica is so that people who want to replicate the tests or perform similar tests know what is involved.  As we have found out, many details and potential problems faced by an experimentalist are hard to determine from the concise papers that are typically published as journal articles.

Faculty Position - Computational Materials Science

Submitted by dcoon on
job

The Department of Mechanical Engineering
at the University of Wyoming invites applications for a tenure-track faculty
position at the Assistant or Associate Professor level in the area of computational
materials science.  The successful
applicant will be expected to establish an externally funded research program, develop
collaboration within the Department and College, mentor graduate students, and teach
at both the undergraduate and graduate levels. 
Minimum qualifications include an earned doctorate in mechanical

Calling a File inside of the UEL

Submitted by ashkan khalili on
ABAQUS
User subroutines in ABAQUS
Abaqus User element UEL
UEL

Hi everybody,

I'm writing a User Difined Element (UEL) for my research.

Would you please let me know if it's possible to call a file (txt, dat, etc) inside of the UEL or not?

Example:

    IF (LFLAGS(3)=1) THEN

        OPEN (UNIT = 10, FILE = "AAA.dat", STATUS = "OLD")

        READ (10, *), StiffnessTable

        AMATRX=StiffnessTable

    END IF

Thanks in advance,

material points will change while using subroutine in ABAQUS

Submitted by niuwenkai on
research
User subroutines in ABAQUS

This subroutine using VUSDFLD is to
determine position of damage and provide evolution of damage surface, when some
elements failed. The “outer” damage status will transfer to “inner” damage
status.

Now the problem is that when I read the
coordinates of material points, using coordMp（k,1),coordMp（k,1),coordMp（k,1), it returns wrong locations. Then I
tried a very simple loop:

Do
k=1,nblock

        stateNew(k,7)=nblock

end Do

CISM Advanced Course "Ferroic Functional Materials"

Submitted by j.schroeder@un… on
conference

We would like to draw your attention to the advanced course at the International Centre for Mechanical Sciences (CISM) to be held in Udine (Italy) from September 8 through 12, 2014 on the topic of: "FERROIC FUNCTIONAL MATERIALS: EXPERIMENT, MODELING AND SIMULATION". The advanced course will comprise of distinguished lectures from the following experts:



- Kaushik Bhattacharya (Caltech, USA)

- Manfred Fiebig (ETH Zurich, Switzerland)

- John Huber (University of Oxford, UK)

- Doru C. Lupascu (University of Duisburg-Essen, Germany)

Job gets aborted due to cpset and nset history output definition?

Submitted by Manram on

Dear all,

 I am modelling an interactin between deformable and analytical bodies by utilisign Abaqus/Explicit. In order to define the contact between those objects I have selected surface-to-surface technique type and applied kinematic contact method as formulation method. As well I have selected individual output for a specially created set of my primary interest. Nevertheless, when I submit a job for analysis it gets aborted and the following warning errors appear:

The cpset or the surface parameter must be specified for history contact output

When is strong and when is weak by using extended finite element method?

Submitted by pfliu@zju.edu.cn on
research
extended finite element method
strong or weak discontinuity

As we know, the extended finite element method has been well used to simulate the localization band propagation and crack propagation without remeshing. It can deal with both strong discontinuity problems (displacement discontinuity) and weak discontinuity problems (strain or acceleration discontinuity). Now, I have always a question: when is strong and when is weak discontinuity using XFEM? In other words, what is the difference for the interpolation function and level set function or other function between strong and weak discontinuity? Thanks.

Liu pengfei

Modelling fracture of graphene using Griffith’s criterion and quantized fracture mechanics

Submitted by Nuwan Dewapriya on
research
fracture mechanics
molecular dynamics
nanomechanics
continuum mechanics
graphene
crack propagation
Griffith's equation
quantized fracture mechanics
fracture of graphene
armchair
zigzag

In armchair graphene sheets, crack propagates perpendicular to the applied strain, whereas crack propagation in zigzag sheets occurs at an angle to the straining direction. This occurs due to different bond structure along armchair and zigzag directions as shown in Fig. 1. Videos 1 and 2 show the fracture of armchair and zigzag sheets, respectively.

 

Fig. 1: Armchair and zigzag directions of graohene

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