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viscoelasticity property material

hi

please wgo can tell me what does mean the folowings:

   -", the modulus ratio in the first term in the Prony series expansion of the shear relaxation modulus."

   -", the modulus ratio in the first term in the Prony series expansion of the bulk relaxation modulus."

and how to calculate them in abaqus

thanks 

post tension in Abaqus

Hello,

 Am working on post tension prestressed concrete with Abaqus,

1-  I would like to know where to find the "initial conditions option and prestress hold" in which module??

2- Rebar option: as per the Help, it is mentioned that i can define a rebar as individual element not as rebar layer in a shell/membrane element. but also couldn't be able to find how and in which module?

Any suggestions?

Wating for a quick feedback

thanks

 

Shabeer Khan's picture

Plastic strain data

Dear All

I am working on Abaqus simulation for thermo-visco-plasticity, especially on necking problem in circular bar.
I need the plastic strain data to add in the material properties table of Abaqus.
And, any help in this regard would be appreciated.

Thanks
Shabeer Khan
MSc Computational Mechanics

Plotting the Johnson-Cook strength model

I'm trying to plot the stress-strain curve described by the Johnson-Cook strength (and eventually damage) models. The strength model is defined as:

σ=[A+Bεn][1+C ln(ε_dot*)][1-T*m]

where A, B, C, n, and m are material constants, ε_dot* is the non-dimensionalized strain rate, and T* is the homologous temperature where T*=(T-T0)/(Tmelt-T0)

To calculate the thermal softening (term in the last bracket of the J-C model), I need to determine the increase in temperature related to an increase in stress (and strain). I'm using the following equation:

Reliability and engineering mechanics

The word "failure" can mean different things to different people.  Over the past couple of years, my interactions with various groups from industry has shown me that for some people failure means catastropic fracture/buckling while for others it can mean highly localized plastic yielding.  Even for relatively simple sandwich composite structures, there is no clearly agreed upon definition of the word.

UMAT code for crystal plasticity

Dear all,

           I would like to ask you something about prof.
Huang's subroutine. I want to verify the code, by using published
stress-strain data. But when I am plotting my stress -strain curve I am
always getting a straight line instead of a curve that shows the hardening effect. What could be a reason for this problem?

         Regards,

         Panos

p.s. I am using a single crystal, single element, and only modify the crystal orientation

IOSO Multiobjective Optimization Technology for Research and Investigations Program

Hello, 

We start a three-year program for academician researchers, PhDs and etc. We suppose that our multiobjective IOSO optimization technology may help you in your research and investigations. 

 

What we offer for you:

Plastic Collapse for a pressurised vessel

Hi there ,

 I'm a researcher from UNSW sydney .

 I'm working on the elastic-plastic-creep based on the exhaution of energy density.

 I've came with a new idea for plastic collapse ,which is based on the exhausion of enrgy .

 The work is not yet publish , because I would like to ask your help here .

 Does anyone know or would like to help me to have an APDL file for plastic collapse analysis in ANSYS

 

Thanks for advance

JOEFFREY

Arash_Yavari's picture

Convergence Analysis of the Wolf Method for Coulombic Interactions

A rigorous proof for convergence of the Wolf method for calculating electrostatic energy of a periodic lattice is presented. In particular, we show that for an arbitrary lattice of unit cells, the lattice sum obtained via Wolf method converges to the one obtained via Ewald method.

Rotor dynamics

 

 

“Project of automatic balancing system for rigid
rotors”

 

 

ABSTRACT

The paper presents the
conceptual design for the automatic system for balancing rigid rotors.

Composite Damage model

Choose a channel featured in the header of iMechanica: 

Hai

 

   Everybody I am trying to design a composite layup and to design a
bulleye hitted by a blunt bullet  and need to do element deletion on it
by using hashin damage model in abaqus but I am new to abaqus please
help me regarding designing of lamina ,failuremodel and element deletion

plasticity model with damage ductile criterion

Hello ,

 

 I´m working in my thesis with abaqus only since 4 months, so I´m quite new. I have to simulate the welding of two sheets with electromagnetic pulse process. Under these kind of processes the material is load under high values of velocity and deformations. Taking into account these conditions I have chosen three different flow plasticity models:

-Isotropic plasticity model without strain rate with johnson cook damage ductile criterion.

ghso's picture

modeling plasticity in ABAQUS

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Free Tags: 

hi 

I want to model a metal with nonlinear kinematic hardening material in ABAQUS. As i read in its user guide manual there is one option in plastic hardening named combined. I want to know if it is an option for modeling a material for combined kinematic and isotropic hardening or nonlinear kinematic?

thanks in advance

Composites design

Choose a channel featured in the header of iMechanica: 

Hai

 

   Everybody I am trying to design a composite layup and to design a bulleye hitted by a blunt bullet  and need to do element deletion on it by using hashin damage model in abaqus but I am new to abaqus please help me regarding designing of lamina ,failuremodel and element deletion

Systematic Evaluation of Bonding Strength and Fracture Toughnessess of Adhesive Joints

We have carried out systematic experimental tests to evaluate the bonding strength and fracture toughness of adhesive joints. Our work has been published in Journal of Adhesion as one among the collection of papers honoring Prof. David Dillard for receiving the Adhesion Society Award for Excellence in Adhesion Science sponsored by 3M.

 Metal-polymer joint designs

Metal-polymer joint designs

Taxonomy upgrade extras: 
Bo Li's picture

Extension limit, polarization saturation, and snap-through instability of dielectric elastomers

A dielectric elastomer is capable of largevoltage-induced deformation, particularly when the voltage is applied on theverge of snap-through instability.  Thispaper describes a model to show that the snap-through instability is markedlyaffected by both the extension limit of polymer chains and the polarizationsaturation of dipoles.  The model mayguide the search for high-performance dielectric elastomer transducers.

 

When Newmark Misses!

                         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:

http://www.adina.com/newsgH84.shtml

rjmecheng's picture

suggest a proposal

Hi everyone,

I'm a master student of mechanical engineering in the field of applied design.

I am looking for a good proposal to convince the university to accept that for

my final research. I appreciate that anyone can help me with this.

thank you 

The "Goldilocks" Effect in Fossilized Dinosaur Trackways

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.201...

Authors welcome any comments for future studies!

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