Hi there,

Can anyone explain me the results I got from Explicit? I am investigating cracks propagation in hybrid timber-glass beam. It is a I-shaped section and consists of timber flanges and glass web bonded with an adhesive.

Please look at the attached diagram - Force versus vertical deformation. Until an initial crack it is almost perfectly linear. But what happens after the glass failure? What could be the reason that the force changes like a wave?

Topic: Behavior of offshore wind turbines under seismic loadings

Detailed description of the subject:
The study of wind turbines is one of the privileged research themes of the renewable energetic resources strategy of the French national agency ADEME (AMI large wind turbine project). The development of offshore wind turbines is considered as a main scientific and industrial goal for the forthcoming years.

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Many researchers have studied the effect of surface energy on the
elastic behavior of nano-structural elements based on Gurtin and Murdoch surface
model. Many of them, however, assumed that the surface energy depends only on
the 2D symmetric infinitesimal surface strains and neglects the second-order
products of surface strains/displacement gradients. Moreover, there are some
researchers assumed that the surface energy is independent on infinitesimal
rotation tensor and neglected all rotation

      The velocities of atoms in MD simulation are not objective quantities, which depend on the choice of the reference frame and sample size. In our previous study (http://imechanica.org/node/3181), we discussed how to overcome this non-objectivity and compute the atomic stress objectively. In this blog, our newly published paper on temperature computation is attached, and the abstract is as follows.

Hi, all,

I recently encounted a big question regarding to the temperature dependent UMAT case. 

I used the UMAT for non-isothermal elasticity as followed. The DDSDDE calculating part is not shown here.

You can see that I output  ETHERM(K1),EELAS(K1),STRAN(K1),DSTRAN(K1) at the beginning of the code.

And this UMAT also saves ETHERM and EELAS to state variable array.

Job set up is no loading and using the static general step. But essentially it is a free expansion with thermal expansion coef of 6e-6 and temperature from 0 to 80, which is reflected in UMAT only. After Abaqus completes the job, these resluts are all correct, SDV(1-6)=EELAS=0, SDV(7-9)=ETHERM=4.8e-4. And the DSTRAN is 4.8e-4 as well.

Can any one tel how to simulate numericall and analytically fracture in polymers?

In this paper, we present a geometric discretization scheme for incompressible linearized elasticity. We use ideas from discrete exterior calculus (DEC) to write the action for a discretized elastic body modeled by a simplicial complex. After characterizing the configuration manifold of volume-preserving discrete deformations, we use Hamilton's principle on this configuration manifold. The discrete Euler-Lagrange equations are obtained without using Lagrange multipliers. The main difference between our approach and the mixed finite element formulations is that we simultaneously use three different discrete spaces for the displacement field.

The full articles selected for this Virtual Special Issue are freely available until 28 May 2013, from the Journal Homepage

Research highlights:
• Outdoor air quality is one of the major environmental problems today
• Micro-scale pollutant dispersion covers the building scale and the meteorological micro-scale
• Computational Fluid Dynamics (CFD) is increasingly used for micro-scale dispersion studies
• Virtual Special Issue groups papers published previously on this topic in Building and Environment

Several recent papers have reported measurements of adhesion energy between graphene and other materials (e.g., Si/SiOx and copper) [1-3]. Like thin films, many experimental methods may be adopted to measure the interfacial properties of graphene, such as the pressurized blister test [2] and the double-cantilever beam test [3]. The challenges lie in the handling of atomically thin membranes and analysis/interpretation of the data.

Dear All

I am quite new in this area.

Somebody can give me an idea on:

How to impose aqua loads by phyton scripting in abaqus?

Thanks in advance

I am solving a simple solid mechanics problem by meshless method.  use RPIM to  calculate shape function.

when i calculate the derivatives of shape function, i found the derivative is not close to zero at the compute point, when the point is on the boundry of problem domain. 

My question is, should the derivative be zero if the node is on the boundry?

One Ph.D. position is now available starting October 2013 on magnetorheological elastomers in the Solid Mechanics Laboratory of Ecole Polytechnique, France. The potential student will work on the development of new experimental procedures and high fidelity numerical models for the understanding and constitutive description of microstructured magnetorheological solids. Students with strong interest in new coupled problems and strong background in engineering, physics or/and mechanics are encouraged to apply.

Please find more information and contact details in the attached pdf file or visit the following webpages:

Hello,

If i know the yield stress,ultimate stress, and modules of elasticity.can i predict the behavior of stress strain in the plastic region using some kind of model.?

Thank you

A new scientific journal, Mathematics and Mechanics of Complex Systems (MEMOCS) [http://msp.org/memocs/], has been launched this winter. You may view the first edition at http://msp.org/memocs/2013/1-1/index.xhtml. MEMOCS is a very unique publication in several ways: a
nonprofit publication owned, managed, and supported by academic
institutions from countries all over the world. Because it is supported
by these sponsoring institutions, subscription fees and page charges are
not necessary, and electronic access to the publication is open
and free to all. Accepted manuscripts are published free of charge