I guess it is about time some one from the Cornell Fracture Group got on this site to try help answer questions related to the CFG software or other fracture mechanics related questions.  We do try to answer questions sent to us via email, but sometimes a forum like this would be best and we do appreciate other users input, feedback, and answers.

Congratulations to Tom Hughes for the election to the US National Academy of Sciences.  See the full list of the new members.

Obama spoke at the National Academy of Sciences on Apr. 27, 2009, in which he states his commitment to doubling of science funding and stem education. From his speech,

 "At such a difficult moment, there are those who say we cannot afford to invest in science, that support for research is somehow a luxury at moments defined by necessities.  I fundamentally disagree.  Science is more essential for our prosperity, our security, our health, our environment and our quality of life than it has ever been before."

hi...i am doing drilling simulation on abaqus.... 



it consist of two parts...a tool and a blank.... 



now when i am running analysis...tool touches the blank and goes back. 



i checked material data...density,elasticity...and i used surface to surface interaction with penalty as interaction property.... 



can any one tell me ...how to perform this.... 

Hi all

   I am a new ABAQUS VUMAT user. Recently, I try to substitute the explicit intergation method in VUMAT by back EULER intergation method. But the calculated equivalent stress is nonuniform for simple compression test. Would anyone pls help me find the reasons? Many thanks. Attached pls find the VUMAT subroutine and INP file.

 J.G. Liu

Ph.D

HK Polyu

Hello Everyone,

 My research is in petroleum geomechanics and I am Using Abaqus for my simulations of cracks and induced fractures in rocks around the wellbore I do have some problms and I will be happy if anybody can assist me:

1- I am interested in looking at Hoop stress at evry point around the wellbore ,but in Abaqus I can only see that in degrees of 0,90,180,270 of circular wellbore by using S1 and S2 ,naybody has a code or experience with that?

2-What is a correct method if we are interested in propping our fractures?

Hi everybody, I'm so interested in analysis of wave propagation in solid medias. and I've started by studying some books like "Ultrasonic wave propagation in solid media"(Rose). My question is about the importance of this analysis  (propagation of high frequency elastic waves) in the structures. I know that the major application is in the field of Nondestructive Testing(NDT). but I don't know if it is usefull in vibrational analysis of mechanical structures (elastic waves with frequencies around KHz or MHz). is this study important in "dynamic response analysis" of mechanical structures in some special kind of loading like impact? I'd be gratefull if you could introduce me some examples.

I have a mechanical problem it is a part of my studies, this problem relates to mechanics of material (geometrical non-linear problems by using Newton Rahpson method (If I was right) I am struggling to solve it. The thing is because of my poor knowledge I could not find the right reference. All I want is a volunteer someone I will send him the problem then he advice me where should I go to find similar examples or at least the right sources

Hi, I am Ms Zartasha Mustansar from the University of Manchester. I am currently working towards my PhD, funded by Microsoft and the Dorothy Hodgkins Postgraduate Award scheme. I am working in the Palaeontology Research Group, headed by Dr Phil Manning, who together with my supervisor Dr Lee Margetts, are leading the development of a new discipline "Computer Aided Palaeontology".

Conference link  May 8th, 2009 -- Abstract Submission

2nd IC4N – 2009 Symposia/Special Sessions on Fundamentals of Nano-materials: experiment, theory and simulation Organizers: Traian Dumitrica (U. Minnesota, USA), Boris Yakobson (Rice U., USA)