Dear All,
I think that many students are looking for some tutorials about writing a UMAT in ABAQUS.
You can find a comprehensive tutorial for elastic problems.
This file contains:
• Motivation
• Steps Required in Writing a UMAT or VUMAT
• UMAT Interface
• Examples
Example 1: UMAT for Isotropic Isothermal Elasticity
Example 2: UMAT for Non-Isothermal Elasticity
Example 3: UMAT for Neo-Hookean Hyperelasticity
Can someone help me to understand this please:
The stretching tensor (D) is the symmetric part of the velocity gradient (L), and if I derive D from L with using the polar decomposition of the deformation gradient (F=RU) I get the relation:
D=0.5 R (Udot Uinv + Uinv Udot) R' ----(Eq.1) where Udot is the time derivative of U, Uinv is the inverse of U, and the prime indicates the tranpose of the matrix.
I am refering to the book - Mechanics of Materials by Beer, Johnston and DeWolf (McGraw-Hill) topic 8.2.
When we design a wide-flange beam, we must consider two conditions. First, the shear stress at the maximum shear section must not exceed the allowable shear stress. Second, the principal stress at the junction of the web and the flange at the section of the maximum moment must also be compared to the allowable normal stress. This is straightforward and clear to me.
I finished the grad course on Mechanics of Soft Materials. It took 14 weeks with 2 academic hours per week and it covered the following topics: 1 Tensors 2 Kinematics 3 Balance laws 4 Isotropic elasticity 5 Anisotropic elasticity 6 Viscoelasticity 7 Chemo-mechanical coupling 8 Electro-mechanical coupling.
I attach the class notes and I will be grateful for the remarks, corrections, and criticism from iMechanicians.
A Summer School on Fracture will be held at the Institut d’Etudes Scientifiques de Cargese, in Cargese, from June 7 to June 18, 2010. This is jointly organized by Elisabeth Bouchaud, CEA Saclay and Krishnaswamy Ravi-Chandar, University of Texas at Austin. Details of the School can be found at http://www.ae.utexas.edu/SummerSchoolFracture/
Hi,
I am trying to do flutter analysis for a wing using fluid structure interaction technique. I know that I need to do simultaneous coupling but couldn't figure out how to do it. Can anyone here give some more detail guide on how I should do it. I am using ANSYS and ANSYS CFX. There is tutorial that come with the software but it is not about flutter analysis.
Thanks,
Freddie
hi i am doing my PG project on plate buckling analysis using abaqus but i struck in initial stage.. to do so please help me...
hi everyone,
i am doing my masters in offshore structures, as part of my thesis work i am doing fatigue analysis of offshore tubular joints. So , i have modeled the typical joints( T joint, K joint and Y joint) in ansys, now i have to model the cracks to find stress intensity factors, then i ahve to estimate fatigue life.
Can anybody pls tell me how to model the crack in Ansys classic, if u have any tutorials or examples please send me.
my mail-id nareshphilics [at] gmail.com
Hi,
I'm an Engineer and a Ph.D. student in Applied Maths, working in the field of Nonlinear Finite Elements for Elasticity. I often think about my future career since, by now, I have a strong experience with coding FE in C++/Matlab/Mathematica, but no clue whatsoever about commercial black-box softwares for FEA. I'm worried about this, since most of the job vacancies from the industry (I'm not interested in pursuing the Academic career) seem to require only experience with a specific software and application, and not to directly code FE.
