Hi Dr. Okereke, thank you for your effort in trying to enlighten us on your field of expertise. One feedback i have is that you break down your processes into simpler steps. Many of us have never used Abaqus and find it extremely difficult to follow your step procedures. I'm transitioning from ANSYS to Abaqus just for this modelling task and find it hard to keep up with what you're doing. Please keep this in mind when making future videos. PS, you've earned my subscription. Keep up the good work!
Dear Professor, I must say you are the best thing that has happened to TH-cam in ages. Thanks for your constant sharing of invaluable knowledge. Please, I have a personal request concerning my thesis (development of an abaqus plugin to predict the sound absorption coefficient of poroelastic materials). I have been trying to replicate the impedance tube experiment in Abaqus but to no avail. I was hoping I can tap from your well of expertise to complete this project. Your feedback would be highly appreciated. Thank you
Hi @Jimmylolu Olajide, thanks for your kind comments. I have not actually worked on this sort of problem so cannot help now. I will try and explore this research area in future.
Dear Dr. Michael Okoreke, thank you so much for constantly spreading knowledge regarding these topics. If I may ask, I am recently trying to analyze gyroid lattice structure TPMS, however, I could not change the STL formst of the gyroid into solid thus I could not import it to abaqus. Could you please help me with issue? Thank you so much
Hello @NM, this should be relatively straightforward to do if you have a dedicated CAD software like SolidWorks. You have to import your STL file into SolidWorks as a solid body. Here is a video that can help you (it is not my video but the content addresses your question): th-cam.com/video/zE3b7d1_OSc/w-d-xo.html
Hi Dr. Okereke, How would you calculate the effective mechanical properties of these lattice structure for eg. the effective young's modulus in the compression test?
Hello, I have a few videos in the channel showing how to calculate Young's Modulus from such test. YOu simply extract stress-strain plot and then find modulus from that. I hope you check the other videos and see what I did. Thank you.
hello dr great content as always... well to be honest i am still waiting for the video about meta material simulations using abaqus software... i have another another question actually which is how i can assign negative poison's ratios to metamaterials ... should I use a umat ?? i can u please suggest a reference that i can read about meta materials and broad my knowledge about them?? i mean computational implementing them
Hello @Amirmohamad Balizadeh, thanks for your interest in the channel. I have not done any work on the metamaterials. I am focusing on other projects. This is a good paper that can help you with your metamaterials modelling of auxetic systems: doi.org/10.1016/j.eml.2016.09.001. On poisson ratio, I think there is a bit of confusion here. You can design the base material with positive poisson ratio for example steel with a poisson ratio of 0.3. However, due to the design of the metamterial (auxetic system), then following loading you can recover a negative poisson ratio often described as effective poisson ratio. This, is a result of a structural behaviour rather than an intrinsic material response. For the later, I do not think you can use the classic hookean elasticity model in ABAQUS to simulate that. I do not know of alternatives of dealing with your query - maybe a UMAT, as you say can help.
HELLO SIR. YOUR LESSON IS SO HELPFULLY TO US COULD YOU PLEASE PREPARE A SUBJECT ON HOW TO IMPLEMENT NOVEL ASYMPTOTIC HOMOGENIZATION AND MAKE COMPARISON WITH RVE AND TRADITIONAL AH.... THANK YOU VERY MUCH FOR THE LESSON.
Doctor, good afternoon. Please, I am PhD student presently and I'm having issues with Abaqus software. I don't know if you can training student on Abaqus software. Please let me know
Hello, thanks for your query. I am not sure exactly of what the problem is with your ABAQUS model. It is certainly a challenging thing working with ABAQUS and can get really frustrating so I understand and share your pain. I do not have a dedicated training video for ABAQUS but this is something I plan to do in the future as I sense it will be useful to many. I often do not offer one-on-one consultation as I tend to answer most queries here and prefer to share videos freely to my audience. However, if you do want to consult with me, then here is a link that might help you book a slot with me: cmvideos.ck.page/products/one-on-one-consultation.
Hello @Abhinav Siliveru, thanks for the comment. It does sound a challenging thing to design the Rhombus Dodecahedron. I gave it a quick go on my computer once I read your comment and I found it not a trivial exercise but I believe it is do-able. If I am able to create it, then I will try and make a video to help. I will suggest you keep watching and see if the video lands. Thanks for stopping by!
Dear sir, thanks A lot for your outstanding demonstration. sir, i have two humble request to you.1. sir can you please share me your email address.2.sir can you please make a video about how to use this micro lattice on macro scale. again i want to Thank you for your innumerable effort and the Materials you are providing us.Lots of respect From Bangladesh
Hello @mazed npu, thanks for your interest in the channel. I am glad you found the contents helpful for your work. On the two queries: 1. My email address is on the About page of this TH-cam channel. Please check there (on the Details section of the About page). You may also like to subscribe to my CM Videos Insider Group (cmvig.cmvideos.org) and you can reach me directly from the Welcome email. 2. Macroscale modelling of such matrices are complicated especially in 3D. There may be a benefit to 2D modelling as this is manageable. I have a video here: th-cam.com/video/4YDnKogZ_Ng/w-d-xo.html, which is a possible macroscale structural modelling of a lattice structure. Maybe, you should consider that to see if it helps. Has this answered your question?
Hi Dr. Okereke,
thank you for your effort in trying to enlighten us on your field of expertise. One feedback i have is that you break down your processes into simpler steps. Many of us have never used Abaqus and find it extremely difficult to follow your step procedures. I'm transitioning from ANSYS to Abaqus just for this modelling task and find it hard to keep up with what you're doing. Please keep this in mind when making future videos.
PS, you've earned my subscription. Keep up the good work!
Hello @boganix, thanks for taking time to provide this feedback. I accept it and will think about 'new ABAQUS users' like you in future videos.
Great video. Thanks lot for your effort 👏👏👏
Thanks
Dear Professor, I must say you are the best thing that has happened to TH-cam in ages. Thanks for your constant sharing of invaluable knowledge. Please, I have a personal request concerning my thesis (development of an abaqus plugin to predict the sound absorption coefficient of poroelastic materials). I have been trying to replicate the impedance tube experiment in Abaqus but to no avail. I was hoping I can tap from your well of expertise to complete this project. Your feedback would be highly appreciated. Thank you
Hi @Jimmylolu Olajide, thanks for your kind comments. I have not actually worked on this sort of problem so cannot help now. I will try and explore this research area in future.
Great work. Thanks lot for your effort !
Thanks @Ahmed.
Great video!
Glad you enjoyed it and thanks.
thanks a great work
You are welcome!
Dear Dr. Michael Okoreke, thank you so much for constantly spreading knowledge regarding these topics. If I may ask, I am recently trying to analyze gyroid lattice structure TPMS, however, I could not change the STL formst of the gyroid into solid thus I could not import it to abaqus. Could you please help me with issue? Thank you so much
Hello @NM, this should be relatively straightforward to do if you have a dedicated CAD software like SolidWorks. You have to import your STL file into SolidWorks as a solid body. Here is a video that can help you (it is not my video but the content addresses your question): th-cam.com/video/zE3b7d1_OSc/w-d-xo.html
Hi Dr. Okereke,
How would you calculate the effective mechanical properties of these lattice structure for eg. the effective young's modulus in the compression test?
Hello, I have a few videos in the channel showing how to calculate Young's Modulus from such test. YOu simply extract stress-strain plot and then find modulus from that. I hope you check the other videos and see what I did. Thank you.
Hello, thank you so much for your reply could you please link the video@@MichaelOkereke
hello dr great content as always... well to be honest i am still waiting for the video about meta material simulations using abaqus software...
i have another another question actually which is how i can assign negative poison's ratios to metamaterials ... should I use a umat ?? i
can u please suggest a reference that i can read about meta materials and broad my knowledge about them?? i mean computational implementing them
Hello @Amirmohamad Balizadeh, thanks for your interest in the channel. I have not done any work on the metamaterials. I am focusing on other projects. This is a good paper that can help you with your metamaterials modelling of auxetic systems: doi.org/10.1016/j.eml.2016.09.001.
On poisson ratio, I think there is a bit of confusion here. You can design the base material with positive poisson ratio for example steel with a poisson ratio of 0.3. However, due to the design of the metamterial (auxetic system), then following loading you can recover a negative poisson ratio often described as effective poisson ratio. This, is a result of a structural behaviour rather than an intrinsic material response. For the later, I do not think you can use the classic hookean elasticity model in ABAQUS to simulate that. I do not know of alternatives of dealing with your query - maybe a UMAT, as you say can help.
@@MichaelOkereke thank you for your answer and your suggestions. I will definitlly consider them ... And thank you for the included refrence...
HELLO SIR. YOUR LESSON IS SO HELPFULLY TO US COULD YOU PLEASE PREPARE A SUBJECT ON HOW TO IMPLEMENT NOVEL ASYMPTOTIC HOMOGENIZATION AND MAKE COMPARISON WITH RVE AND TRADITIONAL AH.... THANK YOU VERY MUCH FOR THE LESSON.
Hello @Fikirini Jr, thanks for this. It is a good suggestion but I am not looking to make this type of video now. Thank you.
Doctor, good afternoon. Please, I am PhD student presently and I'm having issues with Abaqus software. I don't know if you can training student on Abaqus software. Please let me know
Hello, thanks for your query. I am not sure exactly of what the problem is with your ABAQUS model. It is certainly a challenging thing working with ABAQUS and can get really frustrating so I understand and share your pain. I do not have a dedicated training video for ABAQUS but this is something I plan to do in the future as I sense it will be useful to many. I often do not offer one-on-one consultation as I tend to answer most queries here and prefer to share videos freely to my audience. However, if you do want to consult with me, then here is a link that might help you book a slot with me: cmvideos.ck.page/products/one-on-one-consultation.
Can you please design rhombic dodecahedron lattice?
Hello @Abhinav Siliveru, thanks for the comment. It does sound a challenging thing to design the Rhombus Dodecahedron. I gave it a quick go on my computer once I read your comment and I found it not a trivial exercise but I believe it is do-able. If I am able to create it, then I will try and make a video to help. I will suggest you keep watching and see if the video lands. Thanks for stopping by!
@@MichaelOkereke Thanks for your reply Sir.
Hi Dr.
Material proprties and variables of plastic region are unclear
Hello, I am not sure I understand what you mean? Please can you explain better so I can answer correctly?
@@MichaelOkereke I mean what are stress and strain data in plastic region
How to calculate the data for stress triaxialty in the damage criteria?
Hello, I do not have any video about stress triaxiality but there are a few persons in TH-cam that have videos like this.
Dear sir, thanks A lot for your outstanding demonstration. sir, i have two humble request to you.1. sir can you please share me your email address.2.sir can you please make a video about how to use this micro lattice on macro scale. again i want to Thank you for your innumerable effort and the Materials you are providing us.Lots of respect From Bangladesh
Hello @mazed npu, thanks for your interest in the channel. I am glad you found the contents helpful for your work. On the two queries:
1. My email address is on the About page of this TH-cam channel. Please check there (on the Details section of the About page). You may also like to subscribe to my CM Videos Insider Group (cmvig.cmvideos.org) and you can reach me directly from the Welcome email.
2. Macroscale modelling of such matrices are complicated especially in 3D. There may be a benefit to 2D modelling as this is manageable. I have a video here: th-cam.com/video/4YDnKogZ_Ng/w-d-xo.html, which is a possible macroscale structural modelling of a lattice structure. Maybe, you should consider that to see if it helps. Has this answered your question?