- Welcome to Mechanics Forums by Mark Barkey.
Recent posts
#51
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by SOMANATH MOHANTY - March 20, 2019, 06:07:07 PMSir I am a beginner learner in Fracture mechanics. Whatever may be the answer at-least i will get the direction of answer from your comments. Please provide answers.
#52
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by Mark Barkey - March 20, 2019, 02:41:04 AMThose are great questions, but ones that I cannot answer in a meaningful way. Best wishes!
#53
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by SOMANATH MOHANTY - March 14, 2019, 06:26:40 PM1- suppose I want to arrest the crack in mode-1 loading then crack surface is no more traction free. In this case j- integral will give path independent result or it depends on path or j concept is not applicable?
2- what will happen when the same scenario applied on mixed mode loading?
3- if from crack tip multiple cracks originates simultaneously then how j-integral concept will be applied there to find the energy release rate for individual cracks?
4- during mixed mode loading once the crack initiation starts it will move at a certain angle. Is this angle Will change during its fracture path or it remains constant?
2- what will happen when the same scenario applied on mixed mode loading?
3- if from crack tip multiple cracks originates simultaneously then how j-integral concept will be applied there to find the energy release rate for individual cracks?
4- during mixed mode loading once the crack initiation starts it will move at a certain angle. Is this angle Will change during its fracture path or it remains constant?
#54
Welcome Center / Re: Welcome to the forums
Last post by m.caocci2 - February 09, 2019, 11:42:34 AMHello
I study mechanical engineering in Italy, I'm using Abaqus for the
thesis.
Tank you for the great idea of the forum.
I study mechanical engineering in Italy, I'm using Abaqus for the
thesis.
Tank you for the great idea of the forum.
#55
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by SOMANATH MOHANTY - January 28, 2019, 01:56:49 PMThank u sir for your reply
but in question no 2 the path independent of j-integral in mixed mode loading, could you please mention where I can find the derivation in detail?
but in question no 2 the path independent of j-integral in mixed mode loading, could you please mention where I can find the derivation in detail?
#56
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by Mark Barkey - January 28, 2019, 02:24:55 AMQuote from: SOMANATH MOHANTY on January 25, 2019, 02:29:11 AM
Questions
1- what is the physical meaning of stress intensity factor value to be Zero or negative in a centre crack under compression loading or it is not possible to get -ve SIF?
2-in a mixed mode case is j-integral is Path independent?
3- EPFM is applicable to nonlinear material behaviour case but as the process zone is nonlinear then how superposition principle is applicable to this EPFM plastic models like dugdale.. others?
For a center crack in compression, the crack faces should transmit tractions, so the stress fields (ideally) would be very similar to an uncracked plate in compression. I do not know of a situation where a negative stress intensity would be physically meaningful or possible.
I believe that the J-integral should still be path independent for mixed mode loadings, but I have not done the math, or if I have it has been forgotten. I think this should be derived in an advanced fracture mechanics book.
It has been a while since I have looked into the Dugdale model, but it may be the stress fields outside of the process zone for which supperpostition is applied. I will have to let someone else answer that one!
#57
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by SOMANATH MOHANTY - January 25, 2019, 02:36:18 AMHi professor thanks a lot for your videos I learn something in plasticity hope you will provide some videos like how to implement UDF in abaqus and more videos on continuum mechanics.
#58
General Mechanics Discussion / Re: Fracture Mechanics Discuss...
Last post by SOMANATH MOHANTY - January 25, 2019, 02:29:11 AMQuestions
1- what is the physical meaning of stress intensity factor value to be Zero or negative in a centre crack under compression loading or it is not possible to get -ve SIF?
2-in a mixed mode case is j-integral is Path independent?
3- EPFM is applicable to nonlinear material behaviour case but as the process zone is nonlinear then how superposition principle is applicable to this EPFM plastic models like dugdale.. others?
1- what is the physical meaning of stress intensity factor value to be Zero or negative in a centre crack under compression loading or it is not possible to get -ve SIF?
2-in a mixed mode case is j-integral is Path independent?
3- EPFM is applicable to nonlinear material behaviour case but as the process zone is nonlinear then how superposition principle is applicable to this EPFM plastic models like dugdale.. others?
#59
Welcome Center / Re: Welcome to the forums
Last post by Mark Barkey - January 18, 2019, 04:32:46 AMWelcome. Thanks for signing up. It is a bit quiet here, but I promise to keep the site up for many many more years 
#60
Welcome Center / Re: Welcome to the forums
Last post by wasimrezaunsw - January 17, 2019, 07:32:32 AMHello
I am student of structural engineering and I started using Abaqus, it's been only 3 months. I saw you lectures on Youtube combination of theoretical mechanics and application in abaqus, a lot helpful for me to understand how FEM simulation works?
Kind Regards
Wasim
I am student of structural engineering and I started using Abaqus, it's been only 3 months. I saw you lectures on Youtube combination of theoretical mechanics and application in abaqus, a lot helpful for me to understand how FEM simulation works?
Kind Regards
Wasim