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PB Equation

Hi,

I am working on a coupled fluid structure problem , precisley on the elasto-acoustic mode, of a system consist on a cube which define the fluid domain coupled with an elastic plate.

The boundry conditions is:

- all the face of the cube is regid only the face coupled with the plate

Hi everyone,

        I'm working on the strength of  FRP wrapped concrete beams. I'm using Ansys to analyse this. Can somebody explain me how to handle the nonlinearity of concrete and how to analyse the adhesive between the FRP sheet and concrete beam in ansys?

I thought the mechanics community would be interested in the course notes of
Prof. K. J. Bathe on "Finite Element Analysis of Solids and Fluids". This
course was taught at MIT and now is available freely through MIT Open
CourseWare website:

http://ocw.mit.edu/OcwWeb/Mechanical-Engineering/2-094Spring-2008/CourseHome/

Enjoy!

Dear all,

Hello

 What is Lumped Mass in Dynamic Analysis,its Significance?Can anyone suggest its definition please.How do we create it in LS-Dyna.

During the study of FEM, I found the term "weak form" of differential equation, which is the integral form of a differential equation along with the boundary conditions for a boundary value problem. Now my question is that why the term "weak" has been used.

Hi all,

Can anyone explain me the characteristic features of continuum mechanics, micromechanics and nanomechanics?  My present level of understanding is:

Hi,

how do I Determine Z axis ( blue axis ) of the element coordinate ( with solid46 ) in  outward Direction .

in Attached file put the cross section of the Model .

 Regards

These are slides of poroelasticity and diffusion in elastic solids for final presentation based on ES241 notes.

These slides are based on an on-going paper written by Wei Hong, Xuanhe Zhao and Zhigang Suo and Suo's talk in ucsb.

I am trying to implement an analytic formulae of dynamic flow stress in material plasticity in abaqus. The model is similar to FlowStress=K*(PlasticStrain^n)*(StrainRate^m). 

Could you provide help for these 2 questions?

1: Is it OK to define Young's modulus (E) and v in "Elastic" and choose "User" in "Plastic-->Hardening" with the subroutine "VUHARD", instead of by "VUMAT" with plasticity criterion and calculation of delta stress and strain?

sir

can i find natural frequencies of cracked rotating shaft in ansys.i am using contact elements to model crack due to which nonlinearity comes into picture.since modal and harmonic analysis cannot solve nonlinear problems,so please tell me in detail the steps to find natural frequency .

my project submission date is on 15th june and i have no results.pls reply as soon as possible

it will be yr great help.

thanks in advance

pushpendra

iit roorkee

In the field of Solid Mechanics, Harvard has a sequence of 5 graduate courses:

• ES 240 Solid Mechanics
• ES 241 Advanced Elasticity
• ES 242r Solid Mechanics:  Advanced Seminar
• ES 246 Plasticity
• ES 247 Fracture Mechanics

The first course goes over linear elasticity, finite element method, vibration, waves, viscoelasticity, as well as some ideas of finite deformation.

I am wondering a problem slove by ogden hyperelastic model.

I want to know about the basics of stroh fromulation and its application in Piezoelectric material.I didn't find the basic lecture notes or the material regarding that on the internet.

kuldeep sharma 

hello eve1,

i m facing some problem while trying to mesh a horse shoe type structure,  when i define the element type as solid 8 node 70 (brick8 node 70) it gives me error saying cannot apply coz it violaets the ASME code or some hting like that....plz help me out wiht what element type has to be defined for the HORSE SHOE type structure...............or whether to define the semi-circular portion seperately (with wat typr ) and the bottom portion seprate.

Hi!

I`m new to this webpage, and hope for some good answers for use in my masters degree within fatigue. Currently I`m working on calculating the total life of a gusset specimen using strain based fracture mecahnics. I`ve read som articles on the topic, but have some difficulties on understanding the calculations itself. I`m using Excel in the calculations. If anyone has an excel-sheet, or other ways of helping me, I would hihgly appreciate it.

Thanks, Sean Angus

Dear All,

 I am just starting out on my research in fracture mechanics.

Coming straight to the point,

My background is in Engineering and hence, when there things that need
to be resolved Mathematically , I often get confused in the maze of
equations. After some looking around, I realize that I simply did not
know about this theorem or that axiom.I know from my interactions with other students, that I am not alone in this situation.

 Can anyone tell me:

1. What are the absolutely necessary mathematical skills for a career in mechanics

2. How does one go about inculcating them? Which book or whose notes?

 Thanks for your time,

 Siddharth

Hi I'm trying to work out the following problem

The pressure at the start of a 180Km stainless steel natural gas pipeline is 4MPa and at the end is 2MPa.  If the diameter of the pipe is 0.4m, what will be the gas flow rate through the system? (ignore losses other than friction)

(for natural gas, density = 40 Kg/m3, viscosity = 11x10-6)

This is from an exam paper and at the end of the paper there's a moody diagram with roughness values, the closest to stainless steel is commercial steel and has a k value of 0.045 mm.

 I'm not sure how to handle this problem so I used the following formula

Q = ( (PI d4)/(128μL) ) * (P1 - P2)

I will be highly grateful if u will say me how to link subroutines with abaqus....... intel fortran compiler is there.......... how to proceed now????????

Tensor analysis is a very useful tool for continuum mechanics as well as other courses. I wonder which book is best for me. 

I have background of anvanced mathematics, linear algebra.  The book should be comprehensible.

i am not clear about implicit and explicit FEM
kindly let me know the difference of two and where to use which one