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

Submitted by Yogesh Bansod on
education
stress
crack tip
crack propogation path
formation of plastic/influence zone
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. 

Post Buckling of Thin Shells

Submitted by Himayat Ullah on
education

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

Submitted by Y. Wang on
education
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.

Runing of input file

Submitted by iitd.mani on
education

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 

thanks and regards

Mani

IIT Delhi

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