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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)

 

Post-doctoral positions are available in the area of ultrasonic material characterization and nondestructive evaluation (strong background and experience in ultrasonic experiment and modeling are required). The positions are supported from research grants and are intended for several years. The focus area is ultrasonic study of nonhomogenous materials like composites, adhesive bonds and polycrystalline materials. State of the art ultrasonic laboratories and other characterization facilities are available. More details will be provided to interested individuals.

There are several  fully funded graduate student openings starting Spring 2011, in the
Department of Mechanical and Aerospace Engineering at the Utah State
University (http://www.mae.usu.edu).
The openings are in the broad area of Computational Solid Mechanics. In
particular, applicants having demonstrated interest (in terms of
completed projects, authorship in journal articles or coursework) in
Fracture Mechanics are especially invited. Applicants are requested to