industry
Fatigue to Fracture - paper in print
Submitted by Xiao-Yan Gong on Wed, 2009-06-03 16:12.This article will appear in Journal of ASTM International. I hope you find it useful.
Xiao-Yan Gong, President, medical implant mechanics LLC
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Design Optimization Software HEEDS v5.3 Released
Submitted by Marcus Rademacher on Wed, 2009-05-27 20:58.Red Cedar Technology recently released its latest version of their design optimization and process automation software, HEEDS v5.3. It has direct interfaces to Abaqus, LS-DYNA, and other tools.
Check out the press release, or go read about the new features.
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NDE residual stress
Submitted by ennio curto on Tue, 2009-05-19 16:04.More information about residual stress tester
The residual stress in a metal do not depend on its hardness, but from the module of elasticity or Young module and from its chemical composition (density).
The hardness of a metal indicates its ability to absorb energy elastic, plastic or kinetic energy, but through it not possible to determine the value of residual stress. In a metal with the same hardness we will have a different values of this stress. Therefore, the problem will be to measure the values that vary so exactly proportional to the residual stress values in a given metal.
The residual stresses tend to equilibrate themselves in the surface of the material.
Assigning Hardness to part in Abaqus
Submitted by pavan_k on Tue, 2009-05-12 18:57.Hello Friends,
I am working with abaqus since last year,
I am facing the problem in assigning the hardness property to the material in Abaqus.
If some one knows ,how to Assign a hardness in Abaqus Please let me Know.
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Wear Couple Charactersistics - CRES 347, 17-4 PH and Phosphor Bronze
Submitted by navanee on Fri, 2009-05-08 10:18.Hi,
Can anybody throw some light on the wear coupling characteristics between SS347 and 17-4 PH, as well as between Phosphor Bronze and 17-4 PH Steel?
It will be helpful if you could refer to some literature where I can learn about Wear Coupling Characteristics...
Thank You,
Navanee
bifurcation buckling using ABAQUS
Submitted by ranababu on Thu, 2009-04-30 19:57.
The following is taken from the book Concepts and applications of Finite element methods by Cook, Malkus and Plesha.
For bifurcation buckling, we have the following eigenvalue problem:
(K+Lambda Ksigma)delta d= 0
working on Tilting Pad Thrust Bearing...help me
Submitted by sprashant27 on Tue, 2009-04-21 06:34.
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Question about stochastic Finite Elements
Submitted by tlaverne on Wed, 2009-04-08 12:20.Hi to the community !
I would like to ask if anyone have some experience with stochastic finite elements in an industrial context ?
Would you know some software (free or commercial) package for stochastic finite elements ?
Why do I have the feeling that sfem methods which look to be very promising aren't used much in practice ? Am I wrong when I say that ?
Thank you very much for any help about that !
Thomas Laverne
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lagrange multiplier and contact elements
Submitted by ranababu on Sat, 2009-03-07 13:50.Hello,
I would like to know how contact elements are different from " general "ie non contact finite elements.
Also I would like to know how Lagrange multiplier method is used in contcat analysis.
My understanding of the Lagrange multiplier is like this: when we have to impose a constraint equation
[C][D]=[Q] as constraint between DOFs, we incude a term Y*{[[C][D]-[Q]} where Y is the Lagrange multiplier ,in the potential energy functional and minimize the functional to get the algebraic equations.
non linear analysis
Submitted by ranababu on Sat, 2009-03-07 13:39.I am trying to learn non linear FEA ( Newton Raphson method)and this is what my understanding is. Kindly advise if you think my understanding is correct.
Are you looking for KEO Carbon Pedals
Submitted by robpoulton on Mon, 2009-02-23 05:45.Are you searching for KEO carbon Pedals; The Attending KEO Carbon pedal embodies the absolute antithesis amid weight and performance. Twenty years ago if attending aboriginal invented the blow beneath pedal it afresh too was the criterion for all others that followed. At one time Shimano pedals could use attending fabricated cleats and you can see today similarities afresh with Shimano's use of an Attending block attending akin (no pun intended) in their SPD-SL design.
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Is there a failure criterion/model for brittle spheres?
Submitted by shuo zhao on Mon, 2009-01-19 16:20.Hi, everyone
I am a student. I am dealing with a failure problem of brittle spheres. These have a lot of flaws inside.I did some compression tests. Single spheres are crushed by a pair of parallel plates. I got the crush load distribution (in terms of critical contact force).
My question is:
is there a failure criterion/model which relates to load(critical contact force), Youngs moduli and Poisson ratios of shpere and plates, radius and friction coefficient?
Unfortranitaly, I can't get the friction coefficient between plate and sphere which influences the surface stress of spheres significantly as shown in ABAQUS simulation.
Both theoretical and empirical models are welcome.
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Interlaminar Stresses
Submitted by nav_mech35 on Wed, 2008-12-24 05:15.Dear Sir/Madam,
Interlaminar stresses in Composites
I have modelled Plain Stress problem in hypermesh(Input deck is created in Hypermesh to solve in Abaqus).Layup sequence is [0/90/90/0], am getting the Stresses( σ11, σ22, σ12) in top and bottom layers only, but unable to get the stresses at each Interface, If any one knows how to write the code, please reply back.
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Hi, I've a doubt in ANSYS
Submitted by tjasminmary on Tue, 2008-11-11 09:16.My doubt is in transient dynamic analysis.
take a simple model of 40*2*1 m dimensions.Applying brick45 material. with e=2.069e11N/m2
poissons ratio= .3
density= 7830kg/m3
first performing modal analysis with just arresting displacements in 1 side in subspace method and getting 10 sets of frequencies..
then performing transient dynamic analysis in mode superposition method with dynamic loads.and solve it
i can get value of the stress or displacement at each node and i can plot a graph for time vs displacement or stress at that node by using time history post processor.
what i need is
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Announcement: Moceon launches new website
Submitted by meon on Tue, 2008-10-21 05:23.Moceon; world leading experts in high quality all hexahedral meshing, today announces the launch of their website www.moceon.com
Based on the Spatial Twist Continuum, which was discovered by the founder in 1992, a new method has been developed into a commercial level software package that is being rolled out first as a premium high quality hex meshing service.
Moceon also introduces the Cell3 concept, a revolutionary new way to describe a hex mesh with integrated morphing and smoothing capabilities. Cell3 = cells with conformal continua.
This new Cell3 definition breaks the bounds of conventional meshing paradigms by enabling interactive design based modeling.
-Dr Peter Murdoch
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Concrete tied arch
Submitted by Mahendra Gattu on Tue, 2008-08-26 23:21.
Respected imehanicians!
I am a tackling an important problem about the behavior of concrete tied arch. Each concrete arch rests on two steel I-beams. The steel I-beams are supported at their ends. They are connected at various locations along their length by tie rods. A picture is worth 1000 words basic figure.pdf.
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mold filling simulation with flo3d
Submitted by masood_star on Sun, 2008-08-17 17:28.
I want to simulate mold filling of a bar mold with a semisolid alloy by means of FLOW3D cfd package. but there are some problem. for example when I input a file I encounter an error like "level 1 error in subroutine rdstl: level 1 error in subroutine rdstl"in preprocessor. what can I do? does my .stl file have any faults?
other problem with another project is that when i want to solve the problem I encounter an error like "convective flux exceeded stability limit".repeatedly. is my meshing insufficient? how can I solve that too?
any useful guide is appreciated.
thanks a lot.
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nanoindention lab services
Submitted by Dehua Yang on Mon, 2008-08-04 00:24.We are pleased to inform you that Ebatco’s Nano Analysis and Testing Laboratory (NAT Lab) now is open to serve your nanoscale mechanical and tribological testing and analysis needs. The NAT Lab’s staff scientists have more than 10 years of nanomechanical and nanotribological testing, applications R&D and instrument development experience. The lab is equipped with state-of-the-art nanoindenters with nm-resolution in-situ SPM imaging capability and full lines of advanced options such as nanoDMA, modulus mapping, feedback control, heating/cooling stage, vacuum chuck, and environmental control and isolation chamber.
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What is the Shore A hardness used for?
Submitted by Biswajit Banerjee on Thu, 2008-07-31 05:37.The Shore A and D hardness tests are widely used by the rubber industry. However, I'm not sure what practical use these numbers can be put to during design. My current feeling is that Shore hardness numbers can at best give you a feel for the texture of the rubber - a Shore A value of 5 = gummy bear texture, Shore A = 40 implies erasure texture etc.
Can someone explain how Shore hardness values can be used in the design of mechanical components made of rubber?
Thanks in advance,
Biswajit
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Nasa engineers work overnigth in competition against other Nasa engineers !!
Submitted by Mike Ciavarella on Wed, 2008-07-16 12:55.NASA Engineers Work on Alternative Moon Rocket
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2nd position in the oil industry
Submitted by Edward W. Walbridge on Tue, 2008-07-15 02:27.Our Agency, Reliability Analysis Associates, Inc., is seeking candidates for the "Manager, Methods and New Product Support" position described below. Note that the position requires significant work experience in industry. Salary range: $90K - $130K per year.
Reliability
Analysis Associates, Inc.
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Position in the oil industry
Submitted by Edward W. Walbridge on Mon, 2008-07-14 23:55.
Reliability
Analysis Associates, Inc.
1440 North Lake Shore Drive, #30F,
Chicago, IL 60610
Phone:
312-274-0542; Fax: 312-274-0574; E-mail: reliability@nidus.com
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2008 Aerospace Congress; Tampa, Florida
Submitted by CorporatEvents on Thu, 2008-07-10 14:34.
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The Industry's First Commercially Available Off-The-Shelf MEMS Microhotplate For Chemical Sensors Applications
Submitted by Mo Kebaili on Mon, 2008-06-23 16:53.Laguna Beach, CA June 23, 2008 -- Kebaili Corporation a leading California based high-tech company in MEMS and nanotechnology, announced today the release of the KMHP-100 Series, the industry’s first commercially available off-the-shelf MEMS microhotplates for researchers and scientists in innovative chemical sensor research and development applications.
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