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Neo Hookean Model

Submitted by ViRuS on
education

I am modeling a RBC(red blood cell) membrane using shell181 element and
using neo hookean model. But when I try to solve it, it gives error. I
couldnt figure out the cause. Please help me.
This is my input file for creating the model.
/com,structural,,,
/clear,start,,,
/prep7,,,,
k,1,0,0,0.000000405
k,201,0,0,-0.000000405
k,2,0,0.00000005,4.06E-07
k,202,0,0.00000005,-4.06E-07
k,3,0,0.0000001,4.07E-07
k,203,0,0.0000001,-4.07E-07
k,4,0,0.00000015,4.10E-07
k,204,0,0.00000015,-4.10E-07
k,5,0,0.0000002,4.15E-07
k,205,0,0.0000002,-4.15E-07
k,6,0,0.00000025,4.20E-07
k,206,0,0.00000025,-4.20E-07
k,7,0,0.0000003,4.27E-07
k,207,0,0.0000003,-4.27E-07
k,8,0,0.00000035,4.34E-07
k,208,0,0.00000035,-4.34E-07
k,9,0,0.0000004,4.43E-07
k,209,0,0.0000004,-4.43E-07

Pressure on circular area of a semi-infinite plane: typos in textbooks "contact mechanics" "surface mechanics" "elasticity"

Submitted by Huapei Wan on
education

This is supposed to be a very classic analytical solution in applied elasticity. Forgive me if this is a repost or some correction has been made before. I had a hard time with it.

Problem statement:  uniform pressure is applied on cirular area (radius=r) on top of a semi-infinite plane. Find the vertical deflection.

We got discrepancy between FEA solution and analytical solution which I found from different textbooks (famous and non-famous): Deflection within the circle is good, however, no good outside the circle.

Pond design

Submitted by oleg on
Forums
Fluid Mechanics Forum
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. I want to design a detention pond, where should I start? The flow into pond is 1.4m3/s, the existing SW system near the pond is 600 dia pipe. If I calculate the disharge through the pipe using Mannings formula, the max capacity is 1.8m3/s, using the orifice formula for 600 dia pipe it is only 0.5m3/s. So which one should I use? Because if it is orifice one I will need to allow for 3m head water

abaqus cae

Submitted by shazwang on
Forums
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Hi guys..i am an abaqus CAE user and i am creating a model of an annular disc with a clamped at the middle hole. I have to compare the result of the stationary one with the rotating one. But I did not know the command for a rotating disc, as I have tried, I used the rotational body force. The problem is the result is the same as the stationary one which is wrong! i am a beginner at this, so could somebody help me out here, please?

shazwang

Solids Textbooks

Submitted by John M. Kolinski on
education
ES 240
student
2008
HW No.16

      The texts from Timoshenko and Landau and Lifschitz are classics. I think learning the physical approach of L&L is particularly valuable. The following sections are available in L&L:

 1. Fundamental Equations

 2. Equilibrium of Rods and Plates

3. Elastic Waves

4. Thermal Conduction and Viscosity in Solids

Look for insightful physical explanations, and expect to read with a pen and paper at your side, to understand exactly the brilliance behind each statement made.

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