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Shape memory alloy material models including plasticity implemented in ABAQUS

I am working with shape memory alloys (nitinol), and am in that respect investigating fracture behaviour of NiTi, using, among other things, simulations in ABAQUS. ABAQUS doesn't have a material model that include plasticity unless you pay for it. I am wondering if anyone have implemented either of the following models as a UMAT, and if you are willing to share the code with me.


The models I am interested in are:

My newest metamaterial paper: Power loss and electromagnetic energy density in a dispersive metamaterial medium

Phys. Rev. E 80, 046601 (2009) [5 pages]
Power loss and electromagnetic energy density in a dispersive metamaterial medium

Pi-Gang Luan
Wave Engineering Laboratory, Department of Optics and Photonics, National Central University, Jhungli 320, Taiwan

Received 8 March 2009; revised 11 July 2009; published 5 October 2009

The effects of boron dopings and boron grafts on the mechanical properties of single-walled carbon nanotubes

The effects of boron doping and boron grafts on the mechanical behaviour of armchair (6, 6)
and zigzag (10, 0) single-walled carbon nanotubes (SWCNTs) under axial loading are
investigated using the molecular dynamics (MD) simulation method. The results show that
Young’s moduli, the tension strength, the buckling loads and the buckling strains of SWCNTs
decrease after functionalization. The influences of the distribution density of functionalization
on Young’s moduli of SWCNTs are also systematically studied. The results show that Young’s

Ning Wang's picture

Embryonic stem cell softness dictates stress-induced spreading and differentiation

We recently find that embryonic stem cells are very sensitive to a local cyclic stress applied to the focal adhesion.  They spread and differentiate (Oct3/4 downregulation) in response to this local force.

Effective strain rate and strain rate in ABAQUS subrotine

Hi there,

would you please tell me how can I use or calculate the effective strain rate or strain rate in ABAQUS subrotine?

 thank you!

Concrete Damaged Plasticity

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Hi, I am currently trying to model a RC connection and I am using Concrete Damaged Plasticity, CDP, to model my concrete. WIthin this model, you would need to specify the tension damaged against strain or displacement. I have looked through the literature, there are many papers that talk about the damage, but they do not show how the tension damage was obtained.

Force Matrix for Transient Thermal Analysis

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Hi,

I have developed a 2D transient thermal analysis FE code which doesn't
seem to be correct. I am sure there is a conceptual problem in the
formulation itself which I have not been able to understand and could
not find concrete information in books.

I am putting up the question in a very simplified form so as to address the correctness of the formulation.

Help For learning Abaqus

Hi dears

Would you help me about Abaqus learning?

As I search in diffrent web pages and data base 

there is not  enough refrences about abaqus tutorials 

so How can I learn it as a begining user?

thanks for your help

good luck

Kaushik Dayal's picture

Nonequilibrium molecular dynamics for bulk materials and nanostructures

This is a preprint that of an article that will appear in J. Mech. Phys. Solids. (doi: 10.1016/j.jmps.2009.10.008).  Nonequilibrium molecular dynamics for bulk materials and nanostructures,
by Kaushik Dayal and Richard D. James

Teng Li's picture

A quality map of transfer printing

M.B. Tucker, D.R. Hines, T. Li, A quality map of transfer printing, Journal of Applied Physics, 106, 103504, (2009)  DOI: 10.1063/1.3259422

Teng Li's picture

Snap-through instability of graphene on substrates

T. Li, Z. Zhang, Snap-through instability of graphene on substrates, Nanoscale Research Letters,DOI: 10.1007/s11671-009-9460-1 (2009). (Open access)

Analytical Field definition in boundry condition

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Hi Dear iMechanica followers

I came accross a problem when defining displacament boundry conditions. I have been modeling cutting simulation in micron size. so I need to define tool cutter path in a circular shape. I mean cutter should follow the circular or parabolic path not smooth line. To do this I am trying to define analytical distribution in boundary conditions but it doesnt work. I attached the shematic picture of my job of  what I want to do. please look out the attached pdf file and send me your suggestions.

 Thanks in advance

regards

Babichev's picture

Nanotube geometry

Hi folks! I deal with buckling nanostructures, contact problem of nanostructures. And i have a problem with geometry construction of nanotube with arbitrary (n, m) chirality. Can any one write the algorithm for building nanotube geometry in 3d space(xyz-Cartesian coordinate system).  Many thanks!

Alex 

Thiyagarajan Dev's picture

I am looking for PhD position in Composite Materials

Hi Friends,

Iam looking for PhD positions in Composites Mechanics and Manufacturing area.

If you happen to know any information, kindly convey it to me.

Please find my Resume attached for your information.

 

Thanks and Regards,

Thiyagarajan Dev,

India

Effect of Gurson model parameters on the J integral for a CCP specimen with Abaqus

Hi

The question is coupling the Gurson model with the crack propagation on a CCP specimen with Abaqus. Then a study of the influence of parameters of the Gurson model J-intgrale  And deduct the best set  of the parameters with we can adjust the JR curve computed on the experimental curve

 

Pijaudier-Cabot and Bazant concept of non local damage

Hello all,

I would like to seek help on a topic on which I am slightly ignorant.

I do not understand the concept of non local damage and the internal length of the non local continuum as described by the well quoted paper of Pijaudier-Cabot and Bazant (1987) in continuum damage mechanics.  So may I please ask the experts in this forum to please explain to me using some simple analogy.

Dependence of relaxation time on the polymer length (via a string of viscoelastic springs)


Dear all,

According to polymer theory, the relaxation time depends on its length (or unit number), and there exist some relationships to describe such dependence. The smaller number of polymer units, the smaller the relaxation time  of the polymer is. How to describe this via a simple model of visco-elastic springs?

Rui Huang's picture

Excess energy and deformation along free edges of graphene nanoribbons

Q. Lu and R. Huang, Excess energy and deformation along free edges of graphene nanoribbons. Posted online at arXiv:0910.0912, October 2009.

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