I am a new ABACUS user and i would like to model a shoulder bones with applying muscles forces on it. I hope if any one has an idea of applying finite element as well that will be great.
It is generally believed that similar to soluble ligand-induced signal transduction, mechanotransduction initiates at the local force-membrane interface (e.g., at focal adhesions) by inducing local conformational changes or unfolding of membrane-bound proteins, followed by a cascade of diffusion-based or translocation-based signaling in the cytoplasm. However, all published reports, including past studies with the reporter type of construct extended here, were limited in timescale to address this fundamental issue.
Xin-Lin Gao and I had the pleasure of guest-editing a special issue on "scale effects in mechanics" for the journal, Mathematics and Mechanics of Solids (editor: Professor David Steigmann , UC Berkeley).
I just wanted to know if i can consider one part of a FE model as a meshless part and form the global stiffness matrix just by assembling the meshfree stiffness matrix corresponding to the meshfree zone and the FE stiffness matrix of the rest. And then apply the boundary conditions to the model and solve. I would use RKPM to generate the meshfree stiffness matrix.
Carbon nanotubes as strong fibers in CNT-composites are subjected to large deformations in radial direction. They provide strength as well as structural damping in the composite. Despite being strong in the axial direction, CNTs are rather soft in the radial direction.
Many researchers have already used micromechanical modeling techniques such as Mori-Tanaka (M-T), Self-consistent methods and dilute inclusion models depending on volume fraction and shape of the inclusions, etc., to predict the overall mechanical properties of CNT/polymer composites. However, we know that at nano scales the phenomenological behavior of material is different in comparison with micro or macro scales. Although the effects of waviness, interactions, agglomeration, etc.
Hi everybody. My name is Ada. I am a new user on this forum.
I am working with microcantilevers (MCs). Recently I experienced lack of sensitivity. I use MCs coated with nanostructured gold and I use SAM to attach different biological molecules e.g. Protein A, IgG, antiIgG. Everything was working fine until recently.
Would enybody have any sugestions what might be wrong?
On Friday, April 25th, 2008, the 20th Annual Melosh Competition for the Best Student Paper in Finite Element Analysis was held at Duke University. The competition resulted in a tie between Ludovic Chamoin (of the University of Texas, Austin) and Irina Kalashnikova (of Stanford University). Here is a picture of the 2008 Melosh Medalists with the judges, Leo Franca and Nicolas Moes:
Here is a recent work on the Poisson's ratio of carbon nanotube sheet [1]. From the experimental results, the researchers found that the Poisson's ratio could change from 0.06 to -0.20 as the content of MWNTs increasing from 0~100%. The interesting zero Poisson's ratio and auxetic materials were thus found.
I am working on crack propagation . I am trying to figure what factors should be taken into account when the crack is being propagated using XFEM.
I am especially interested to know what happens to the additional dof's corresponding to enriched nodes. Once the crack is propagated and crack tip is at new location , we add new dof's corresponding to enrichment functions , but what happens to the information stored by the dof's of previous enriched nodes,do we forget them altotgether , or do we map it to the new enriched nodes?
Strain gradient based (non-local) plasticity and damage models have been studied quite extensively in the literature.
I was wondering if anyone has experience in the development of cohesive zone models that obtain the tractions in front of crack tip not only as a function of the diplacement jump, but also as a function of the gradient of displacement jump.
1) the example and the role of an Academy of Engineering to find the correct blend of credentials and consensus to set research needs
2) The final 14 NAE resulting "challenges", being set at international level, should be accepted worldwide. Is this really the case, are the European Agencies considering them, or do they think we need to duplicate the search for the "challenges" separately?
I have promised more replies on Mandelbrot, fractals, strongly emotive discussions in journals, and here is a coincise statement, which I take from a Nobel prize, prematurely passed away last year. I think it has a lot to teach (including the kind of attitude that leads to Nobel prize, i.e. close to no human weakness), you will recognize the real name of the "Caesar" in this book is somebody with a 58 pages CV on his web site, most likely.
For a better idea of fractals, read please the other attachment.
Recent experiments by Arnold et al. (ChemPhysChem, vol. 5, 2004, p383 ) revealed that a distance of less than 58-73 nm between receptor-ligand bonds is necessary to ensure focal adhesion in cells adhering to ligand-coated substrate. An elegant solution to this problem is supplied by Lin, Inamdar, and Freund.
I have a query regarding how to evaluate shape functions of nodes on the boundary (natural boundary conditions ) for weak from for mesh free method.
Mesh free method which I am using is Radial point interpolartion function for the interior nodes and mesh free weak from for the nodes at the boundary ....but facing trouble with the shape function to be used.
Saint-Venant's Principle is important in the theory and application of elasticity and its proof or formulation is a major attraction for authors. Among others，Toupin's Theorem plays the most influential role in the history of development concerning Saint-Venant's Principle.
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