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How to use non-dimensional form in open source codes instead of Units

Submitted by crg123 on
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# Finite Element modeling
2D plasticity
units
dimensionless analysis

I am using an open source FEM platform, which requires you to convert your equation system to non-dimensional form. So, there are no units specified for the parameters in the problem. If you use compatible input units, you should expect the output in matching unit - just like one would do in a normal python or C++ code for solving physical problems. I have an elasto-plastic dynamic problem to solve, and these are the parameters for the Drucker-Prager Soil Model for soft clay.

E = 5000000;                 // Young's Modulus in N/m^2 or Pa

Problem between diaphragm and embeded region in ABAQUS

Submitted by akram fetoh on
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Hello every one,

I am modeling a core (C shape) subjected to lateral load. I used embeded region constraint to contact steel bars and stirrups to the solid core. Then i want to apply the load at one end of core, but i need to contact all points in this end with a diaphragm to take the effect of the slab which aren't modeled. But i thing that ABAQUS doesn't permit to use two constraints at the same point. So what can i do to constrain the steel bars to core and also to constrain all points at one end with a diaphragm.

Thanks in advance

Rectangular frame calculation by beam finite elements

Submitted by Arifdjanov Abdulla on
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Beam elements are very widely used in structural engineering. Here we consider the methodology for calculating the rectangular frames with articulated or rigid nodes. The load is evenly distributed and concentrated.  The result is exactly the same with the results of the method of force and displacement method. A practical example of the calculation of the frame. The input data for the program will be the number of items and the number of degrees of freedom, geometrical and physical characteristics as well as the degrees of freedom of information for each item.

Journal Club for October 2016: Roughness evolution of biomaterial surfaces

Submitted by Henry Tan on
research
Biomaterials; Biomechanics; Nanotechnology

As an example, here we discuss implant-associated infection from the mechanics point of view on bacteria adhesion affected by the biomaterial surface roughness:

1.    Implant-associated infection, a leading cause of failure in many biomedical devices, is caused by adhesion of bacteria to the surface of biomaterials. Implant-associated infection is difficult to treat, for example, joint replacement infections may occur deep around the artificial implants.

Elastic-plastic analysis by 4 nodes isoparametric finite element. Theory Mises

Submitted by Arifdjanov Abdulla on
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 The relationship between the strains and stresses will be considered based on the premise that for every increment of load deformation occurs, consisting of two parts - the elastic and plastic

 The program of calculation by finite element method. Basis of its program described in the work [Siratori, T. Miesi, and Kh. Matsushita,Numerical Mechanics of Fracture], which has implemented the theory of plastic flow and deformation theory. The plastic problem is solved by the incremental method of loading, with each increment of load shifted one element to the plastic zone.

Fatigue crack propagation

Submitted by Lazuardi Pujilaksono on
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fatigue crack propagation
Plasticity
Fatigue
crack
uhmwpe
fatigue crack

Hi, I'm trying to perform a supposedly-simple experiment on fatigue crack propagation of UHMWPE. I use a compact-tension specimen on a servopulser hidraulic testing machine. I will try to do the experiment on a fix Pmax with a varied force ratio (R) from 0.1 to 0.5. I'm having trouble in deciding the maximum force Pmax. How does one decide the amount of force applied for FCP testing? Calculation steps and so on.

Time-dependent deformation behavior of polyvinylidene fluoride binder: Implications on the mechanics of composite electrodes

Submitted by Siva P V Nadimpalli on
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thin film
lithium ion batteries

Time-dependent deformation behavior of polyvinylidene fluoride binder: Implications on the mechanics of composite electrodes (http://www.sciencedirect.com/science/article/pii/S0378775316312721)

Arnuparp Santimetaneedol, Rajasekhar Tripuraneni, Shawn A. Chester, Siva P.V. Nadimpalli 

Compatible-Strain Mixed Finite Element Methods for 2D Compressible Nonlinear Elasticity

Submitted by arash_yavari on
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Mixed finite elements; finite element exterior calculus; nonlinear elasticity; geometric mechanics; Hilbert complex

In this paper, using the Hilbert complexes of nonlinear elasticity, the approximation theory for Hilbert complexes, and the finite element exterior calculus, we introduce a new class of mixed finite element methods for 2D nonlinear elasticity -- compatible-strain mixed finite element methods (CSFEM). We consider a Hu-Washizu-type mixed formulation and choose the displacement, the displacement gradient, and the first Piola-Kirchhoff stress tensor as independent unknowns. We use the underlying spaces of the Hilbert complexes as the solution and test spaces.

How to know the element number within an hetval subroutine

Submitted by Fausto Tucci on
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abaqus HETVAL element number

Hi everybody

I'm a new user of abaqus and I'm trying to describe the heat generation in a changing phase thermoset polymer using abaqus user subroutine HETVAL. I need for my computations the current element number (in such a way that I can find the adjacent elements in the connectivity matrix).

Does anyone have any suggestion?

Thank you

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