# education

## VUMAT of Drucker Prager, help needed please..

Hi Everyone,

I have written Drucker Prager in VUMAT version as shown below..but still there are some deviation with the original in built version of ABAQUS. I have all the notes how i derived these equation.could you please show me where the code has gone wrong or have i missed a critical point in here..i tried my best to spot the error but could not..may be you all experts could find it. Thank you very much.

subroutine vumat(

1  nblock, ndir, nshr, nstatev, nfieldv, nprops, lanneal,

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Hello together,

my professor just failed me in an oral exam. It was shwn a graph of a piezometric headline that increased. I said that its because of an increase of the diameter of the tube. He said afterwards:

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## Nominal vs. net strength

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I have difficulty accepting the definition of "nominal strength" and "net strength" given in Shigley's Mechanical Engineering Design.

Consider a plate of width w, thickness t, with a hole of diameter d centered at w/2, loaded with force F.

Shigley's says: the "net stress" is \sigma_net=F/(wt) and the "nominal stress" is \sigma_nominal=F/((w-d)t). ==> I think he is wrong!

According to: http://dictionary.reference.com/

Net:

— noun

## New educational program: MSc Advanced Dynamics of Discrete and Continuum Systems

St. Petersburg State Polytechnic University (Russia) opens a new MSc program in mechanics and mathematical modelling. The program is designed for training highly professional scientists and engineers with the theoretical background and practical experience in theoretical mechanics, computational mechanics, IT, mathematical modelling and simulations, and distributed computing.

## Bridgman and tensile test

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Dear all I came up with some stress distributions which exist in a cylindrical specimen in a tensile test. However, I cannot understand how these formulas were gotten. There is a reference to a Bridgman paper (1944). Is there anyone who can give some inputs abouts this?

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## University of Michigan Continuum Physics and FEM lectures available online

Open.Michigan is a University of Michigan initiative that enables faculty, students, and others to share their educational resources and research with the global learning community. As part of this, Continuum Physics and Finite Element Method lectures offered by Prof. Krishna Garikipati are now available online on youtube and open.umich.edu.

## Novice ABAQUS user seeking advice on damaged plasticity reinforced concrete model

Hi
all,

I
am an ABAQUS novice working on a graduation project.  My model is a
reinforced concrete Tee-joint with steel rebars and stirrups embedded to the
concrete.  The concrete is modeled using the Damage-Plasticity model, with
mostly default suggested values.  The elastic and plastic values are
derived from experimental values.  In addition to the embeddment, the
column and the beam is tied together using the tie command.  The model is
subjected to an axial load as well as a displacement force.

## Please recommend a good mechanics of material book

I am teaching mechanics of materials to sophomore. However, our students do not have a separate static course. They get a some exposure to free body diagrams in particle dynamics. I am currently using the book by Gere and Goodno. But I found that both the teaching and learning experience were not good. Thanks a lot in advance for your suggestions!

Wenbin

## Free Elementary Differential Equations and Real Analysis Textbooks by William F. Trench

1. ELEMENTARY DIFFERENTIAL EQUATIONS

2. ELEMENTARY DIFFERENTIAL EQUATIONS WITH BOUNDARY VALUE PROBLEMS,

## Picture frame shear test

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Hi,

I'm trying to simulate a picture frame shear test using ABAQUS and I have landed up with some problems for which I haven't been able to find any solution from almost a week. Any help would be much appreciated!

So, here's the problem:

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## Isotropic hardening law

Hi all,

I have come across the two relations where aim to describe the isotropic hardening of a material

Power law:

R = Kεpn R is the variation in stress from initial yield, εp is the plastic strain where K is the strenght coefficient and n is the strain hardening exponent as observed in Ramberg Osgood equations.

Exponential law:

R = R∞ [1-e(-bεp)] where R∞ is the saturated value of the R variation, b is the rate at which the sauration is reached.