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Douglas P Holmes's picture

Rising Beyond Elastocapillarity

Douglas P. Holmes, P.-T. Brun, Anupam Pandey, and Suzie Protière, Soft Matter, 12, 4886-4890, (2016).

Lateral torsional buckling of I beams with restraint

I am looking to model buckling of I steel beams with restraint in abaqus. But I do not know how to make rigid connections between the steel members. 


Why is the other beam( beam with fixed supports) not stressed? How do i define contact between the two beams.

Arash_Yavari's picture

On superelastic bending of shape memory alloy beams

In this paper, a closed-form solution is presented for bending analysis of shape memory alloy (SMA) beams.

Corotational 2D Tangent Stiffness Matrix

Dear All,

As a part of my PhD project I need to implement the tangent stiffness matrix of a 2D beam co-rotational formulation.

 So I will apreciate if somebody can show me the components (coefficients)  of the element tangent stiffness matrix.

Thanks in advance


Calculating BMD for a hollow pipe beam

I have tested steel pipe (as a beam) under lateral distributed loads. Longitudenal strain gages are on the top and bottom lines of the pipe. Could any one suggest to me how can I derive the bending moment distribution along the pipe. I have E, I , t (thickness, and r(radius) for the pipe.

 I have found a formula from litrature as follows : M = K.E.I

Where K = curvature = 0.5 * (ε_tension side - ε_compression side) / C (i.e the Half Section Depth, or pipe radius)

Wenbin Yu's picture

Three-ways to derive the Euler-Bernoulli-Saint Venant Beam Theory

After having taught graduate structural mechanics for several years, I am finally
able to write down my lecture notes (attached) for teaching the beam theory. In
the notes, we formulated the complete classical beam model
(extension/torsion/bending in two directions), which is also called
Euler-Bernoulli-Saint beam theory, in three ways: Newtonian method, variational
method, and variational asymptotic method, using 3D elasticity theory as the
starting point. Many self-contradictions of the various assumptions used in both
Newtonian method and variational method are clearly pointed out. The

montero's picture

ABAQUS - Problem concerning "concrete damaged plasticity" model

Hi all,

I'm trying to solve a frame structure in ABAQUS. I'm using 3D beam elements (B31) so that shear and bending stresses may appear. This is ok for an elastic analysis, but I also want to perform a failure analysis of this frame. Therefore, I'm trying to use the "concrete damaged plasticity" material in ABAQUS.  But I've read in the manual I can't use B31 elements with this material.

 Does anyone know how to combine the "concrete damaged plasticity" material in a 3D beam analysis? Any other suggestions?

yawlou's picture

Help regarding 2D co-rotational beam formulation

I have implemented a 2D co-rotational truss formulation in matlab.  I get identical results to OpenSEES.

Now I'm trying to implement a 2D co-rotational beam formulation.  I have followed the simple formulation in Crisfield's book volume 1.  It seems like this should be a fairly straight forward extension of the truss formulation.  I have rederived everything Crisfield has done and obtained the same results, yet something is still incorrect.

Strain energy release rate of beam specimen using J-integral

Hi All,

Are there any good references showing the detailed derivations of elastic strain energy release rate using J-integral instead of differentiating compliance for end notch beam samples : DCB, 3/4 point bend ...? many thanks ...

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