research
Sardinia radio telescope finite element model updating by means of photogrammetric measurements
The 64 m diameter Sardinia Radio Telescope (SRT), located near Cagliari (Italy), is the world’s second largest fully steerable radio telescope with an active surface. Among its peculiarities is the capability of modifying the configuration of the primary mirror surface by means of electromechanical actuators. This capability enables, within a fixed range, balancing of the deformation caused by external loads. In this way, the difference between the ideal shape of the mirror (which maximizes its performance) and the actual surface can be reduced.
How to calculate Stress intensity factor through FE programming?
Dear all,
I need to calculate SIF through a FEM program by writing some line of codes. The problem is that I wasn't able to find a reference contains straightforward formulation and procedure for this. Can anybody help me please with this issue?
Cordially,
Mohammad
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Heat seal properties of polymer–aluminum–polymer composite films for application in pouch lithium-ion battery
Polymer–metal–polymer composite films are widely used in packaging, building, and cooling, and more recently as envelopes for pouch lithium-ion batteries (LIBs). The influences of heat seal temperature and dwell time on the heat seal strength (HSS) of five different multilayer films were investigated by T-peel testing. The failure modes were observed and analyzed by digital optical microscopy. Heat-sealing temperature and dwell time interacted and simultaneously influenced the HSS. Temperature was confirmed as the primary factor while dwell time was secondary.
Write out local material orientation
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I have set up a vibration problem. I assign a local material orientation by assigning coordinates a and b to define the 3rd material direction. From documentation, I understand that the other two directions are assigned to be orthotropic to the 3rd direction. Beyond that, I think that they are set somewhat arbitrarily. I want to output each component of the local material orientation.
*Orientation, name=Ori-DS_LV_DS_LV_FIBRES, definition=COORDINATES, system=RECTANGULAR
DS_LV_DS_LV_FIBRES
1, 0.
Transfer printing enabled soft composite films for tunable surface topography
Transfer printing, an emerging manufacturing technique for heterogeneous material integration, is combined with the unique mechanics of soft composite films to realize a responsive surface for tunable topography in this work. Soft composite films are fabricated by transfer printing thin silicon ribbons on elastomeric films in a staggered manner. The corrugation formation in soft composite films requires a well-organized spatial distribution of the silicon ribbons which is enabled by transfer printing processes developed here.
Micromechanics Simulation Challenge
cdmHUB has completed the level I micromechanics simulation challenge. Several micromechanics methods/tools including both commercially available tools such as Altair MDS, ESI VPS, Digimat, SwiftComp and research codes such as MAC/GMC/HFGMC and FVDAM, are used to analyze six typical 2D/3D microstructures. All the results and model files, inputs and outputs, and the report are hosted on cdmHUB as a live project at https://cdmhub.org/projects/mmsimulationchalleng/.
How to link gfortran with Abaqus6.14 ?
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Dear Abaqus Experts:
I am new Subroutine user and I want to analyze plastic deformation behavior of micro component.
So, I have to link Abaqus,gfortran,and Microsoft Visual Studio.
I tried several methods by reference to the following link,but I have not yet been successful in them.
So, I'm a very necessary help of Abaqus experts.
Detail
1) I added the command "mingwvars.bat" to Abaqus Command > right click > properties > target
Graphene and Carbon Nanotubes are self-stressed
In the attached paper we have shown that graphene and carbon nanotubes are in a self-stress state in their natural equilibrium state, that is, the state prior to the application of external loads. We have identified different sources of self-stresses and accurately evaluated them; we have shown that they are by no means negligible with respect to load-related nanostresses.