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Journal Club August 2010: Deformation Mechanisms in Nanotwinned FCC Metals
Submitted by Yashashree on Sat, 2010-07-31 23:52.Although the nineties witnessed an intensity of research on nanocrystalline metals owing to their ultra-high strength, the early enthusiasm was met with severe disappointment due to their brittle nature and loss of structural stability. In contrast, research over the past few years has provided compelling evidence that nanotwinned structures may be the optimal motifs for the design of both high-strength high-ductility materials. Indeed, nanotwinned Cu containing twin lamella of 20-100 nm thickness has been shown to possess a yield strength in excess of 1 GPa with elongation to failure as high as 14%, which is in sharp contrast to nanocrystalline Cu having a yield strength of about 400 MPa and elongation to failure of about 2-3% for comparable grain sizes [1].
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suo group research
Submitted by Zhigang Suo on Wed, 2007-08-01 23:14.- RSS feed for the posts: http://imechanica.org/taxonomy/term/85/0/feed
- RSS feed for comments: http://imechanica.org/crss/term/85
- Full list of PDF files of papers from the Suo Group
- Slides of research presentations
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RSS feeds for the Job Channel
Submitted by Managers on Wed, 2007-02-28 01:47.You will be alerted whenever someone posts to the Job Channel if you subscribe to RSS feeds.
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question about abaqus
Submitted by rainy_boy on Thu, 2010-09-02 11:17.Hi guys
I want to simulate a problem with abaqus,but during runing of my project,percent of process not increas for axample when i change mesh sizes to biger runing go up to 50 % and when i change mesh sizes to smaller than the previos size,it occure again but in 25%
is there any one that know about this problem,i'm trying to solve it for 2weeks but i cann't.
I'm waiting for your suggestions...
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question about abaqus
Submitted by rainy_boy on Thu, 2010-09-02 11:15.Hi guys
I want to simulate a problem with abaqus,but during runing of my project,percent of process not increas for axample when i change mesh sizes to biger runing go up to 50 % and when i change mesh sizes to smaller than the previos size,it occure again but in 25%
is there any one that know about this problem,i'm trying to solve it for 2weeks but i cann't.
I'm waiting for your suggestions...
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- 24 reads
PhD position in the area of mechanical design of compliant robots
Submitted by alberto.parmiggiani on Thu, 2010-09-02 08:37.Department of Robotics Brain and Cognitive Sciences - RBCS (http://www.iit.it/en/rbcs/)
Italian Institute of Technology - IIT, Genoa
Application deadline: Sept. 24th 2010
Project Description:
Conventionally designed robots are made of metal parts, bearings, levers, gears or other components that are assembled with fasteners and screws, to obtain the desired functionality. An alternative approach is to derive this functionality directly from the properties of the materials and to embed components as, for example, with shape deposition manufacturing. CAD and FE simulations are essential tools to design and optimize the details of the robot's shape.
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Accelerometer mounting and measurement
Submitted by adanoop on Wed, 2010-09-01 14:11.Hello all,
I need to mount an accelerometer in the test rig for dynamic measurement (machine condition monitoring). I am using MMF make KD41V accelerometer. The machine has limited space and I have to protect the accelerometer from splashing oil due to continuous lubrication. Due to space constraint, i have came up with a design in which a 25mm long, 25 mm diameter hylam material block is used in between machine face and accelerometer. Hylam material acts as insulator too. My question is, if i use such a long material in between accelerometer and machine face, will it affects the reading? Schematically this is shown in the following figure. Please guide me!
-Anoop A D
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Two Ph.D. positions are open at the University of Brescia, Italy
Submitted by AS on Wed, 2010-09-01 13:13.
The group of Mechanics of Solids and Structures at the University of
Brescia is seeking two candidates for Ph.D. positions. The appointment
is starting on January 1st 2011, application deadline Sept. 15th 2010.
The research topics involve: computational dynamics of solids with
reference to ground motion simulation due to seismic input, multiscale
computational fracture mechanics and discrete dislocation mechanics.
Interested applicants are welcome to send a resume to
Programme of the CONTACT course now available
Submitted by Edwin Vollebregt on Wed, 2010-09-01 08:56.Dear all,
The programme for the course on "Contact mechanics with the CONTACT software", to be held October 28th-29th 2010 in Delft, the Netherlands, is now available via the registration form on our website www.kalkersoftware.org.
Best regards,
Edwin Vollebregt
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ansys rotor dynamics analysis
Submitted by masoudeng on Wed, 2010-09-01 08:32.dear all
I need information about ansys rotor dynamics modeling and vibration analysis. please help me in this reserc.
tanks everyone.
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Postdoc and PhD Student Positions available in Nano-Mechanics, Multiscale Modeling and Ultrasonic testing
Submitted by Zhu on Tue, 2010-08-31 19:11.Qualified applicants are welcome to send CV to gzhu@yorku.ca
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Seeking opportunity as Postdoctoral Research Fellow/Structural Analysis Engineer.
Submitted by Sushil Singh on Tue, 2010-08-31 17:53.SUSHIL SINGH
Address: 417 Reed street
Tuscaloosa, AL 35401
Tel : (205) 239 1696 E-mail : singh.sushil@live.com
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FATIGUE CRACK PROPAGATION-- ITS IMPORTANT
Submitted by Amit S. Kulkarni. on Tue, 2010-08-31 06:48.FATIGUE CRACK PROPAGATION-- ITS IMPORTANT
Hello,
Currently , I am working on the fatigue crack propagation in ANSYS 12.1. Can anybody help me regarding how to get the next cracktip position?
Currently, I am referring to the paper named, “Mixed mode fracture analysis of aluminium repaired panels using composite patches” , Authors : Hossein Hosseini-Toudeshky, Bijan Mohammadi, Hamid Reza Daghayani.
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could somebody help me to find a paper ?
Submitted by aken on Tue, 2010-08-31 03:17.could somebody help me to get a paper,named
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CONSTANT Velocity Gradient
Submitted by John Craighead on Mon, 2010-08-30 21:37.I'm hoping that someone can share the physical significance (i.e. type of motion) resulting when the (spatial) velcity gradient L is constant. I'm not certain if L constant wrt to only position or also time. Gurtin (The Mechanics & Thermodynamics of Continua, pp. 107-08) uses this assumption to develop the motion equation given below.
I think (?!) that the resulting motion can include rigid body and uniform stretch but not sure. I'm also wondering if the exponential term, additive decomposition of L into spin & stretch rate, & multiplicative decomposition of F into F = RU = vR suggests a Lie group/algebra relationship for this motion.
Thanks,
John
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Carbon Nanotube Initiated Formation of Carbon Nanoscrolls
Submitted by Teng Li on Mon, 2010-08-30 15:56.- Teng Li's blog
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questions about abaqus software package
Submitted by Loay-kh on Mon, 2010-08-30 14:52.Hello
I was analyzing pavement subjected to traffic wheel load. I was using the load as cyclic pressure. Suppose an amount of pressure with 200 different time frame. But I am not getting the right result as measured. So, would you please help on applying moving load? How can I assigned that load as moving load? where can I find the step load function? how can I determine the initial increment? is it more realistic to simulate the wheel load as dynamic? how can I do that?
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Does Anyone has older version of FRANC3D i.e. version 2.6
Submitted by ayjwat on Mon, 2010-08-30 14:15.
Hi
I am facing some problems with FRANC3D 3.2 as my getting different errors. Does anyone has the older version of FRANC3D i.e. version 2.6.
Furthermore all the manuals are for older version.
Kindly let me know if anyone has.
Thanks
Ayjwat
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cantilever column
Submitted by hany_333 on Mon, 2010-08-30 12:03.hello all,
i modeled a cantilever column with eccentric loading to simulate half of ordinary column, i get a small displacement at cantilever tip (equals 1/3 of reality,) so i want ahelp a bout updating geometry during analysis in order to getting effect of second order/nonlinear effects due to eccentric load.my software is ANSYS
thanks for all,
for contacting or sending any information my e-mail address:hany_well70@hotmail.com
best wishes.
hany ghazalah
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hydostatic load
Submitted by Sonu J K on Mon, 2010-08-30 10:57.Hai,
i tried to apply hydrostatic pressureon a plate.But the input file showes,it is distributed load .how can i get correct figure i.e, uniformly varying load on the plate
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boundary condition in plate analysis
Submitted by M.Hassan Mansouri on Sun, 2010-08-29 18:41.Dear All
I have a problem with some theories in plate analysis such as bending and buckling of plates.
you know that in various theories of plates, equations have different order and different number of boundary condiotions must be apply. for example in classisal theory of plates we have 4 B.C., and in first order shear deformation theory the number of B.C. are 5.
I am confused, how should I recognize the number of required B.C. in each theory?
Regards
Mansouri
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Analysis of grinding using nano cutting fluids with ANSYS.
Submitted by manoj konduru on Sun, 2010-08-29 16:30.Hello,
Im doing my M.Tech project on 'Analysis of grinding using nano cutting fluids with ANSYS" . But ANSYS has to work at nano level.. So how to make programming to make ANSYS to use to solve nano level problems.
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Finite element modelling
Submitted by parisa on Sat, 2010-08-28 09:49.Hi,
I am modellling a beam with a hole in ABAQUS and runs pretty well. Now I would like to model a small area of the beam.
For an example the rectangular area which has been shown in the attachment file. When I model it What should I put as a boundry
conditions ?. I know that you may say that reactions of the beam (namely, Moment, shear, axial force) but I would like to just
investigate this part under pure bending and shear. What should I do?
A model without support is unstable ????
It is a crazy idea but how could it be followed?
Thank you,
Parisa
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analysis for large deflection
Submitted by hany_333 on Sat, 2010-08-28 05:35.hello all,
i modeled a cantilever column with eccentric loading to simulate half of ordinary column, i get a small displacement at cantilever tip (equals 1/3 of reality,) so i want ahelp a bout updating geometry during analysis in order to getting effect of second order/nonlinear effects due to eccentric load.
thanks for all,
for contacting or sending any information my e-mail address:hany_well70@hotmail.com
best wishes.
hany ghazalah
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Extracting Load proportionality factor from odb file in ABAQUS using python script
Submitted by ssha6693 on Fri, 2010-08-27 07:32.
Dear firends,
I run some abaqus input files and got my odb files(for example 100 odb files in a specific folder with the name of try). I want to extract LPF (load proportionality factor for whole model) using python script (In my analysis I used static riks). I used the following commands but when I run my script I get an error :
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