I have been watching some small seeds germinate on different media.
The root pops out first, from a split in one end of the seed, navigates down to the substrate, then inserts itself into the substrate if it can (e.g. when placed on sand or soil). Otherwise it grows along the surface horizontally (on filter paper). The vertical growing plant also puts out a horizontal set of very fine root hairs, at the ground surface, and then stands up, lifting the seed into the air with the first leaves still stuck inside the seed.
Using ANSYS, I'm trying to create a single 2D cell model that has 3 components - nucleus (represented by a circular area), cytoplasm (represented by a circular area) and cytoskeleton (represented by a line). When I apply a load on the model, the link element of the cytoskeleton does not deformed whereas the rest of the solid elements (nucleus and cytoplasm) deform. I can't find a function that i can use to glue the line to the area of interest. Does anyone know how to combine or embed a link into an area?
Thanks & regards,
I need a bit help in preparing my seminar topic on the subject "Miniature disk bend testing".If anyone can help me out from this problem i will be indebted for life time.
You can post me the link, sites, any information on my email id- firstname.lastname@example.org.
waiting for a reply.
please help me out from this problem
I have written a user element subroutine by FORTRAN but when I call it through the ABAQUS (version 6.4), during loading the inp file, an error produces related to FORTRAN compiler (Compaq visual Fortran 6.5) as below:
ABAQUS JOB 2
ABAQUS version 6.4-PR11
I am new to X-FEM, started reading papers a couple of weeks before. I understood, functions[heaviside,sign..] are used to enrich the nodes to simulate virtually the discontinuity and asymptotic functions are used to charecterize the crack tip,other than this regular FEM nodes are there. I have few questions.
1.what is the role of the asymptotic functions and its unknown co-efficient 'b' in charecterizing the crack tip. What are the parameters do these functions exactly charecterize means wat are the details can we extract from these fns n co-effs?
recommend more references about this topic: S. van der Zwaag Editor, Self Healing Materials-An Alternative Approach to 20 Centuries of Materials Science. Springer, 2007. about half of this book talk self healing polymers.
I am implementing visco-hypoelasticity in my FEA code for my research as
given in the 4.8.6 ANSYS manual.
I have relaxation only in the shear modulus and not in the pressure. The
manual doesn't give the explicit expression for the shear elastic stress
term and the pressure stress term. I extrapolated the expressions from what
is given, and the code is not working properly. Can you please tell me if
the following expressions for the shear elastic stress and the pressure term
If not, please let me know the equations of the pressure part and the elastic stress part.
- Shear Elastic Stress (Sinf)
I am a third yr undergraduate student of Aerospace Engineering department, IIT Kharagpur. I have a very simple question in strucutral mechanics. Is there any analytical solution available for deflection of plate under distributed load?
There is a global need to extend the lifetime of materials in order to reduce maintenance and energy costs. One route to achieve this for polymeric materials is through self-healing. There are two routes for activating a self-healing mechanism in polymer composites. Outside stimuli such as heat, light, mechanical, or chemical agents may be applied after damage has occurred in the polymer. This is effective, but requires an infrastructure (more $) to monitor and then fix the damage. A second route is to incorporate the healing mechanisms within the framework of the polymer matrix. In this case, when the material is damaged the localized damage is repaired and the crack no longer propagates through the material. For this week, I focus on two mechanisms of self-healing.
We recently find that podosomes, very dynamic, self-organized structures, can function as mechanosensors. For details, see the recent issue of Current Biology.
Capture the dynamic behavior of dislocations in nanocrystalline Ni with its average grain size less than 10 nmSubmitted by zwshan on Fri, 2008-08-29 04:07.
Metallic glass in bulk form is known to have superb strength and elastic response but very limited plastic deformation ability. Through machining the metaillinc glass into submicometer pillars, experiment found that metallic glass can actually sustain very large plastic doformation (see attached Figure). The detail of this finding can be found in our most recent publication: Z. W. Shan et al, Plastic flow and failure resistance of metallic glass: Insight from in situ compression of nanopillars, Phys. Rev. B 77, 155419 (2008) (6 pages). Videos are availabe upon request.
I am performing bolted joint analysis, I want to know the what is the effect of the preload.
If preload is applied/removed whether there will be any effect on the deformation of the bolt and component.
what is the relation between the bolt preload and deformation.
Postdoctoral Research Position – Computational Solid Mechanics Weapons and Materials Research Directorate (WMRD, US Army Research Laboratory (ARL) Aberdeen Proving Ground, MD WMRD has an immediate opening for a postdoctoral research associate to conduct research in high rate damage and failure of ductile and brittle materials. Researcher would be part of a team that includes scientists at WMRD/ARL and faculty and students in Mechanical Engineering and Materials Science at The Johns Hopkins University under a Cooperative Research Agreement.
please if any of you peoples have any information on parallel manipulators / parallel robots please send to me..on
i am soing a project on this topic....
We have studied experimentally and theoretically the response of randomly folded hyperelastic and elastoplastic sheets on the uniaxial compression loading and the statistical properties of crumpling networks. The results of these studies reveal that the mechanical behavior of randomly folded sheets in the one-dimensional stress state is governed by the shape dependence of the crumpling network entropy. Following up on the original ideas by Edwards for granular materials, we derive an explicit force-compression relationship which precisely fits the experimental data for randomly folded matter.
I am a new member in your site, I do research on (the theory of propagation of elastic waves in the composite) with the theory of self consistent,
I seek PlZ of documentation on the theory of self consistent and if you can helped conceranat this subject.
thank you in advance
Finite Deformation Effects of Residual and Strain-Dependent Parts of Surface Stress on Resonant Properties of Metal NanowiresSubmitted by Harold S. Park on Wed, 2008-08-20 15:56.
There has recently been a great deal of discussion on imechanica regarding the effects of surface stress on the resonant properties of nanostructures such as nanowires. The controversy has revolved around the strain-independent part of the surface stress, which can be shown, i.e. by Gurtin et al. APL 1976, 529-530, or by Lu et al, PRB 2005, 085405, to have no effect on the resonant frequency of the nanobeam. The reason is because in taking the moment, and differentiating the moment to get the beam equation of motion, the strain-independent part of the surface stress drops out as it is constant, while the strain-dependent (surface elastic) part survives the differentiation.
A linear constitutive thermodynamic relation between thermodynamic force f and flux v.
v = Mf, where M is the phenomological coefficient.
How to constitute a nonlinear thermodynamic constitutive relation for an unknown system which we expect to exibit nonlinear behaviour?
I am using exponent Drucker-Prager model at the moment, is there anyone can tell me where the follow exponent D-P eqation comes from originally?
(σ e)(σ e)=λ(σt)(σt)-3(λ-1)σmσt
Where λ= is hydrostatic stress sensitivity parameter and equal to σc/σt, σe is effective stress, σm is hydrostatic stress, σc, σt are stresses under compression and tension, respectively.
In a recent rapid communication (see attached paper), using principles of pattern formation, we expose some simple stategies to reliably produce perfect long range order in self-assembling systems. Most self-assembling systems exhibit short ranged order. This imperfection is detrimental to several practical applications. It is almost always possible to produce perfect patterns in small domain sizes but self-assembly over a larger areal span results in defects.
I'm trying to model a composite structure with shell 99 element in Ansys.
I set the thickness and material no. in real constant and prepare an orthotropic material property for that. While ploting the result, as I expect to get the stresses among layers different from other points, but the result is a kind of uniform isotropic graph.
I don't know if any setting other than real constant and material property should be done to get a true result or not. and if I'm true then how can I read the true result.
I will appreciate any help.
Thanks in advance.