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Crack tip stress and formation of Plastic/influence zone for composite solid rocket propellant

Crack tip stress and formation of Plastic/influence zone for composite solid rocket propellants

The necessity to understand the crack behaviour of composite solid rocket propellants as it helps in analysis of service life of rocket motors. Experimental data reveals that a material’s microstructure at the crack tip can have a significant effect on the local damage near the crack tip and crack growth behaviour in particulate composites. 

shear stress distribution in nanotubes

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David J Unger's picture

J-Integral Elliptical Hole (Plane Stress) Perfectly Plastic Material

Choose a channel featured in the header of iMechanica: 

The fracture mechanics community may be interested in a new evaluation of a J-Integral for a fundamental geometry:  an elliptical hole in a perfectly plastic material under the Tresca yield condition for plane stress loading conditions. The analysis is exact and involves only elementary functions.  This makes the problem suitable as a classroom example or as a homework problem for a graduate level course in fracture mechanics.  See J. Elasticity (2008) 92:217-226. http://www.springerlink.com/content/102932/

Post Buckling of Thin Shells

It is difficult to conduct post buckling analysis of thin shell under axial compression using Arc Length method in Ansys.
The Minimum & Maximum Arc Length radii are chosen by hit & trial.When imperfections are incorporated in the FE model,  some times the solution diverges at a higher critical load that the eigen value  buckling, which should be vice versa in actual. Some times , negative eigen values are also shown.

Is there any easy way to solve this nonlinear stability problem?

Himayat

What is the meaning of nonhardening Material

I am getting confused with a definition of nonhardened Material as I read the book Fracture Mechanics written by T.L. Anderson.
I got two understandings and am not sure which one is right.
1)    Material with lower yield strenth, which was not work-hardened.
2)    d(stress)/d(strain) = 0 after yielding.

STRESS DISTRIBUTION IN NANOTUBES

(All my simulations and research is conducted under guidance of respected Dr. Henry Tan, Uni. of Manchester)

STRESS DISTRIBUTION IN NANOTUBES

Konstantin Volokh's picture

Nice and low-cost introductory texts

There are two very nice companion texts on continuum mechanics and nonlinear elasticity printed by Dover recently: "Continuum mechanics" by Spencer and "An introduction to the theory of elasticity" by Atkin and Fox. Great and fairly affordable reading!

Runing of input file

Dear friends,

if i have one input file i will import by file---model---inputfile

the i will see what they did in othermodules, for learning from exapmle problem

but if i have morethan one input file mean main input file and node information and element information both are seaprate input for reduc thesize of file.

how to import via part--model--

so how to merge this more than one input file 

contact & Geometric non linearity

I am looking for acadmic material to address contact & Geometric (Large deformation) non-linearity problem. Can anyone provide the material to address these two concept in details.

Thanks

Ritesh Parikh

Neuber Plasticity correction

All,

Can we used Neuber Plasticity correction method to composite material to estimate equivalent elasto-plastic stress from linear elastic stress results ?

Can anybody provide some document which support the usability of Neuber method to composite ?

Thanks

Notes On Linear Static Analysis & Dynamic Analysis

Hi friends i am new user and 1 year experienced guy in CAE field in  Pune, India.

    i wants some tips/notes in Linear Static Analysis & non Linear analysis.

 Tips/ Notes about softwares like MSc nastran, Abaqus will be useful for me. So plz tell me how can i obtain them.

elastomer gasket life prediction

my project is life prediction of elastomer gaskets in ic engines using fea.     how can i select the constitutive model and the life prediction associated with which mechanism whther stress relaxation, stress softening or  excessive creep

 

Analysis and Optimization

I m Manoj, doing my Mtech in CAD/CAM. I  m doing my project work in design analysis & optimization of seatback of  car seat. I want the information about rear impact & theory material for the same.

Thank's all in advance.

How to import Ls-Dyna files(*.k) to Abaqus CAE 6.7 Edu version

How to import what i beleive is Ls-Dyna files with an extension (.k) in to Abaqus CAE 6,7 edu version?? . Any free translaters are available or can it be done with Abaqus itself ??

 Thx in advance

mike 

Naghdi's Notes on Continuum Mechanics (ME 185)

 Professor Naghdi's classnotes on continuum mechanics are posted at http://me.berkeley.edu/csml/other.html, and are also linked from my faculty page under "ME 185"

Concreate Prestress Model Not converge in step Loading

Dear Sir,

 

             I 've mater thesis project about prestress concreate bridge. On the first step I used Bolt load for represent prestress on Tendon

to hold all bridge block. And second step I apply load on vertical load such as 3 point bending test. On the first step I can run it completed. But on the second step it not converge. I need some comment for help mesolve this problem

 

                                                                                                                        Thanks you 

Adhesive modeling in ANSYS

Hello,

Anybody knows how to model Adhesive between two block in ANSYS? Please help me out by suggesting the approprate method(s). 

I will welcome any appeal for clarification, required in this question.

Thanks

Ritesh 

 

Amit Acharya's picture

Deformation 'Gradient', Right/Left Cauchy Green Compatibility

I post some (hand-written) notes on compatibility conditions for both small and finite strains that I have used for helping me in lecturing. These may be useful for our student friends on imechanica. I also post a paper on compatibility conditions for the Left Cauchy-Green field in three dimensions as well as the paper by Janet Blume on the same subject.

Modal analysis of reactor internals of PWR

In Modal analysis of reactor internals of PWR how the mass of moving water will be added in the structure in ansys.

finite element analysis

Can i have some notes on FEM & FDM?

I am a ew member

   I am a first year student of civil school in Myanmar.

I wanna get knowledge from all of you about civil engineering. Please show me the way to the success by a civil engineer .If u have something to guide me,u can send email nalazyboy@gmail.com

     thanks to all

Rui Huang's picture

Engineering Mechanics 397: Thin Film Mechanics

Time: Tuesday and Thursday 2:00 - 3:30 pm

Place: ECJ 1.214, University of Texas at Austin

Instructor: Rui Huang, WRW 117D, (512) 471-7558, ruihuang@mail.utexas.edu

Lecture notes (coming soon)

Homewrok sets (coming soon)

Brief Outline of Topics

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