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Compressor Operator B 30.67 hour

Submitted by DominOC on

About Us

Dominion is one of the nation's largest producers and transporters of energy, with a portfolio of approximately 27,500 megawatts of electric generation, 11,000 miles of natural gas transmission, gathering and storage pipeline and 63,200 miles of electric transmission and distribution lines. The company operates one of the largest natural gas storage systems in the U.S. with 947 billion cubic feet of capacity, and serves nearly 6 million utility and retail energy customers in 10 states.

creating zero thickness cohesive elements using tetra mesh

Submitted by matunt on

Hello everyone,

I am working on crack simualtion by creating zero thickness cohesive elements by editing the nodal co-ordinate in ABAQUS. I am able to simualte it on some of the components using hexa mesh , but for complex components it should be meshed with tetra mesh so,   my question is , is it  possible to create zero thickness elements using tetra mesh in ABAQUS? If it is then please guide me  through this problem.

Thank You.

Dynamic necking can avoid notches

Submitted by D.Rittel on

Following an earlier post on dynamic necking of tensile bars, we show in the attached paper (to appear in JMPS) that the presence of deep notches in the specimen does not necessarily dictate the location of the neck. Various material parameters are identified and modeled numerically, to assess their respective influence. Strain-rate sensitivity is identified as an important factor.

Surface preparation of dental implants

Submitted by D.Rittel on

It is commonly admitted that "rough" surfaces promote osseo-integration of dental implants. Numerous studies emphasize an optimal Ra parameter for this purpose. One very common way to achieve that state is the so-called "grit blasting" process whereby tiny ceramic (alumina) particles are shot on the implant's surface.

Up to here for the basic story.

It has also been noted in other instances that surface blasting may not be entirely beneficial and it should be controlled, in terms of blasting pressure, particle size and shape. 

Dental implants can fail......

Submitted by D.Rittel on

Contrary to the common naive feeling of clinical dentists, it so happens that dental implants can also fracture. This is a very unpleasant event which necessitates a surgical extraction procedure. So far, the most part of reserach on dental implants has been emphasizing biological failures and biocompatibility related issues. Mechanical aspects of implant design have been touched upon and a lot of work has been done on the surface condition of the implants to allow optimal osseo-integration. Those are all central clinical issues.

Abaqus tools

Submitted by Sri Nikhil on

<p>Hi all</p>
<p>im modeling an laminated rubber isolator in abaqus and i have used mooney rivlin model.My model consists of three layers of rubber and steel plates in between.&nbsp; I dont know how to view the results for seperate parts of rubber and also how to adjust the contour plot valuees. kindly help me with it. thanks in advance.<a href="http://imechanica.org/comment/26854#comment-26854"><br /></a></p>

Experiments with porous materials

Submitted by D.Rittel on

The additive manufacturing technology, among its many advantages, allows us to manufacture solids with controlled enclosed porosity. To the best of my knowledge, this was not doable with conventional machining technologies, but now this is done. In the attached document, the interested reader will find experimental results (both static and dynamic) describing the influence of the porosity on the specimen's performance. We show that while the volume fraction is indeed an important parameter, aas expected, the spatial arrangement of the voids is also of prime importance.