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Displacement control VS. force control in Abaqus

Submitted by mahmood seraji on
research
methods of loading

Dear friends,



I have modeled a simply supported beam, using wire and the circle section of 1mm and a length of 110mm. I did two analyses


1) I used the distributed load of 0.2 N/mm (where the beam behaves in
the elastic area) and got the maximum displacement (at center).   

2) I used the obtained max displacement (from first analysis) as a
displacement control. the results of the reaction forces are supposed to
like the distributed load at first analysis, but it is much lower.

The surface effect on the strain energy release rate of buckling delamination in thin film–substrate systems

Submitted by tongqing.lu on
research
thin film
surface effect
buckling delamination

Gurtin–Murdoch continuum surface elasticity model is employed to study the buckling

delamination of ultra thin film–substrate system. The effects of surface deformation and

residual stress on the large deflection of ultra thin film are considered in analysis. A

concept of effective bending rigidity (EBR) for ultra thin plate is proposed on the basis of

Gurtin–Murdoch continuum theory and the principle of minimum potential energy. The

governing equations with EBR are formally consistent with the classical plate theory,

Periodic Boundary Conditions for Non-orthogonal Unit Cell

Submitted by twehrkamp on
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Hey guys,

I'm currently doing my master thesis on failure analysis of braided composites.

I want to apply Periodic Boundary Conditions on my non orthogonal (say for a braiding angle of 30°, it becomes a parallelogram) unit cell, and then load the whole thing by applying concentrated forces to a set of dummy nodes (which I call ConstraintsDrivers). I use the equation option in Abaqus. PBCs are defined in global XYZ axes (see attached pic), but I define my loading in a rotated CSYS (x axis from bottom left point to upper right).

Now here's the problem:

J integral variation through thickness in tubes with through-wall circumferential crack, calculated with Abaqus/CAE

Submitted by Marcos Bergant on
research
ABAQUS/CAE
J integral
tube
through-wall circumferential crack

Dear friends: I am a PhD candidate studying fracture problems in tubes. I am doing J integral calculations in Abaqus, for tubes with through-wall circumferential cracks subjected to tensile and bending loads. I am using quadratic 20 nodes isoparametric elements with reduced integration (C3D20R), ranging from two to five elements through the wall thickness mesh.

Strain rate values

Submitted by tonesthomas on
research

Can anyone guide me in clearing this doubt? I would like to get the values of normalized flow stresses Vs Strain rate for 304 L stainless steel and Ti-6Al-4V. This values will be used as an input for simulating fan blade-out event. This values will be used since this process involves higher velocities, higher deformations and it occurs in less time.

Computational homogenization of linear viscoelastic materials: a simplified approach

Submitted by Julien Yvonnet on
research
viscoelasticity
multiscale methods
computational homogenization

Several methods have been proposed for numerical homogeniation of linear viscoelastic materials, mainly based on Laplace transform or on multilevel (FE^2) approaches. In this paper, we introduce a much simpler technique based on a discrete representation of the effective relaxation tensor related to the homogeneous medium, which can then be used to evaluate the constitutive law in the form of a convolution product. In practice, calculations on the RVE reduce to 3 transient simulations in 2D and 6  in 3D. More details in

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