education

Problem is using static/riks option

I have some problem in defining the material properties using UMAT. I want to simulate the cubic stress-strain traction-sepration law. Solution doesn't converge after max load is applied (i.e zero slope of stress-strain plot). I am using riks solver. I have written my stress -strain relationship as below in UMAT file. Please tell me how to converge the solution even after zero slope of stress-strain relationship. Can i make my load factor(lambda) negative in riks option.


A lack of heroes, a lack of open culture

One of the things that I've thought about often in relation to mechanics is:

 1)  There's a paucity of heroes. Growing up, my heroes were not mechanicians. Certainly not any of the mechanicians in the last 100-150 years. Physics has it's heroes: Feynman, Hawking, Einstein, Wheeler, Bardeen, Oppenheimer etc. etc.


Carl T. Herakovich's picture

Berger on Video Solutions for Teaching Mechanics

Professor Ed Berger, Univeristy of Virginia Mechanical Engineering, is featured in the Chronicle of Higher Education for his use of web technologies and, in particular, "video solutions" for teaching undergraduate mechanics courses. See http://chronicle.com/weekly/v54/i34/era01301.htm.  Or contact Berger at berger@virginia.edu.  Ed hasn't used this approach for all undergraduate mechanics courses as yet, but the potential is there. 


cbrinson's picture

New Book on Polymers and Viscoelasticity

I wish to inform the imechanica community about my recent book,  Polymer Engineering Science and Viscoelasticity, Springer, 2008. THe book starts at the beginning and contains both the physics of polymers and the mathematics of viscoelasticity. It is also unique in the history of mechanics in being the (first ever?) father-daughter book. Those interested in polymer mechanics may find this a useful resource! It may be found in your library or further information can be found here
http://www.springer.com/chemistry/polymer/book/978-0-387-73860-4?details...


shaofan li's picture

New Graduate Textbook on Micromechanics and Nanomechanics

World Scientific Pub. Co. will soon (2008 Winter) publish a new graduate textbook on Micromechanics and Nanomechanics.  The book is based on a lecture notes that have been used in Berkeley for seven years. Reading of book requires minimum knowledge of continuum mechanics and mathematics, and the book is intended for the first year graduate students as well as those practitioners who have no time to read the literature for self-study.


Is the limit of stress intensity factors "1" when the crack length is close to "0"?

I have read some papers about fracture mechanics of functionally graded materials. I find there are different results for the stress intensity factors when the crack length is close to "0" . In some papers the values of stress intensity factors are "1" when the crack length is close to "0" , but in other papers the values of stress intensity factors are not "1". I obtain the stress intensity factors is "1" when the length of crack is close to "0". I hope to get the explaination about the results.Thanks a lot.


XFEM

Hello,

As far as I understand from the previous blogs: we can now embed XFEM in ABAQUS. Is this approach restricted to linear elastic behavior? Can we simulate fracture propagation in an elasto-plastic material ("XFEM coupled with ABAQUS" type analysis) or is this approach only limited to fracture propagation in elastic materials.

 Thanks,

 Uno.


FEM Analysis of Composite plate girder Bridge

hello friend,

my self jignesh patel, give some guide about the construction stage analysis of composite section.How to appy live load (movind load) in Construcion stage Analysis.

plz reply me if know abt the content.

thanks 


Power Hardening

Hi all!

I am trying to simulate the tensile test in ABAQUS. Could you please tell me how I can incorporate the power hardening stree strain relation in ABAQUS?

Thanks in adavnce

Usitha


Harvard Engineering

The April issue of the IEEE Spectrum featured the recently re-named Harvard School of Engineering and Applied Sciences, and the man who made it happen:  Dean Venkatesh “Venky” Narayanamurti.  With incredible energy and ingenuity, Dean Venky has been leading his colleagues to build up Engineering at Harvard.  He has to answer obvious questions:  How would Harvard make a mark in engineering with the mighty Massachusetts Institute of Technology just down the street? And why would Harvard, essentially a liberal arts college, want to do engineering anyway?  To learn about the man and his answers, read the Spectrum article.    The Harvard School of Engineering and Applied Sciences has been the host of iMechanica. 


thermal analysis

What are the good books to refer for thermal analysis with practical applications.


What is the meaning and advantage of“ isoparametric element” in FEM?

Does the FEM software( ANSYS,abaques,et al) ues the isoparametric element  concept?

 Thanks for your reply。


problem in full transient analysis

hi friends

i have problem in full transient analysis in ANSYS 11.0

kindly give me solution.

i have data .....

BEAM FOR IMPACT LOAD 

lenth=144 inch 

area=120 sq inch 

moment of inrtia=1000 inch rest to four

depth=10 inch

elastic modulas=3605 kips per sq inch

density of material=8.6805E-5  kips per cubic inch

FOR SOLUTION..(force 23.8 kips is linearly decreases from time = 0 to 0.042 at centre of the beam)

at time = 0 sec , force = -23.8 kips

at time = 0.042sec , force =0 kips 

time increament = 0.002 sec 

 

 


Basic information about Plasticity

Does anyone know of a simple book, approximately 50 pages or so, for plasticity?. I am looking for something that is similar to Morton Gurtin's "Topics in Finite Elasticty" published by SIAM. This book is an uncluttered treatment of finite deformation elasticity and was very useful for me during graduate work. I am NOT looking for 200-300 page texts, becasue I will never get around to reading them.

 -Amit 


Stress Concentration at the corner of a "change in angle"

Does anyone know how to calculate the stress concentration at the corners (a change in angle of a straight line)??? if you do, could you explain it to me and present equations.

 


Zhigang Suo's picture

Elastic dielectrics, slides for a short tutorial

Rob Wood teaches a course on micro/nano robotics, and asks me to give a 30-minute tutorial on the theory of dielectric elastomer actuators (DEAs).  I attach my slides, which might be useful to you if you'd like to include this topic in your class.  The tutorial draws upon work in the literature, as well as recent work in my group:


Graduate Research Supplements (GRS) to Current ENG Awards to Broaden Participation

(This message was sent to iMechanica by Ken Chong, of the National Science Foundation).  This letter is to call your attention to an opportunity to broaden participation particularly of underrepresented students in Ph.D. programs in engineering through supplements to current research grants funded by the divisions in the Directorate for Engineering (ENG) at the National Science Foundation.


3D fracture analysis using Ansys

hi,

i m vijay doing M.TECH in aerospace,  i m doing project in the area of fracture mechanics using Ansys, so i need to find Energy release release rate for 3D plate (composite plate having cracks on thikness). i want material related to this, can anyone plz send the material.

thanks in advance 


tutorial for hot deep drawing simulation

I  am  final  year  student  ,  doing  my project    on  "hot deep drwing  on  non-ferrous materials"  and    doing  simulation  on  abaqus . I  need  a  tutorial ,,,,,,,,,,,please   some  one  help


K value calculation in Ansys

I am trying to calculate K values for a double tip crack orientated at 45 deg in a rectangular plate in ansys.I am stuck with a strange problem. When i give the Kcal command it says the crack face is not parallel to the active x axis. But i have checked the cordinates of the keypoints that i have used to create the crack. The crack is perfectly symetric about the active cordinate system  about the crack tip.Can somebody help me please.


Abaqus/CAE version 6.6

 Dear all,

For my final year project, I've done the 3D model of a test fixture which is used for the compression testing of a specimen.

When I apply a downward vertical displacement to top Slider B, eventually the 2-slider linkage mechanism will cause the bottom Slider A to move horizontally and to compress the cube shaped specimen.

 


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