Пікірлер

• 
  @mirzaabubakar47193 күн бұрын

  All verifications are passed Except (1) Verify test : Abaqus/Standard with user subroutines verification .. log located at C:\temp\verify\user_std\user_std.log result : ERROR : Abaqus/Standard with user subroutines verification (2) Verify test : Abaqus/Explicit with user subroutines verification - 'Abaqus/Explicit single precision user subroutine' Failed. - 'Abaqus/Explicit double precision user subroutine' Failed. .. log located at C:\temp\verify\user_exp\user_exp.log result : ERROR : Abaqus/Explicit with user subroutines verification (3) Verify test : Abaqus Doc_root verification .. log located at C:\temp\verify\docUrl\docUrl.log result : ERROR : Abaqus Doc_root verification Please tell me how can i solve this problem

• 
  @davidmichael81794 күн бұрын

  Why in your Abaqus model, failure of coupon is not happening at centre of the specimen.

• 
  @hnrwagner3 күн бұрын

  Why should it? Have seen many tests some start above mid section or near edges

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  @davidmichael81793 күн бұрын

  @@hnrwagner if it's equal pulling force applied on both ends, where the boundary conditions are fixed and if specimen dimension are uniform. It should fail at mid length or almost near to mid length right ?? Else if the force applied is non uniform, where the force is higher it will break near to that support. Am i right or wrong

• 
  @hnrwagner3 күн бұрын

  Its a dynamic explicit simulation, there are many simulation and also meshing parameters which also influence the results, in theory it should break in the mid section

• 
  @davidmichael81793 күн бұрын

  @@hnrwagner let me ask you one more doubt Why can't we do with a static general simulation

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  @hnrwagner3 күн бұрын

  @@davidmichael8179 as far as i know the static solver cannot handle such large deformations and element deletion as well as explicit solver

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  @arnobbaiga3184 күн бұрын

  Will it works for abaqus 2014 also?

• 
  @hnrwagner4 күн бұрын

  Cant say, probably not

• 
  @hnrwagner5 күн бұрын

  The Python Scripts for the Tower Analysis can be found here: github.com/hnrwagner/Round_Robin_Wind_Turbine_Tower

• 
  @hnrwagner5 күн бұрын

  The Python Scripts for the Tower Analysis can be found here: github.com/hnrwagner/Round_Robin_Wind_Turbine_Tower

• 
  @hnrwagner5 күн бұрын

  The Python Scripts for the Tower Analysis can be found here: github.com/hnrwagner/Round_Robin_Wind_Turbine_Tower

• 
  @hnrwagner5 күн бұрын

  Python Scripts and Inp files for this example are here on Github: github.com/hnrwagner/3PB_Concrete_Bar

• 
  @amangarg99217 күн бұрын

  Hi Prof., During analysis, I got the error, "The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively". How to recitfy it?

• 
  @reginawagnerbiolife78677 күн бұрын

  Open result file ,and check the element Set which has lead to this error, refine mesh in this Area

• 
  @mateuskostka21319 күн бұрын

  Hello, thank you for this Video. I use old Abaqus Version 6 14. Is this the reason why i cannot Open your subroutines? If yes do you know how to fix it? Thank you very much😊

• 
  @user-kb1ds1si7f10 күн бұрын

  Why is the damage I produced different from yours? Mine starts with a parallel fracture from the middle, while yours is slanted

• 
  @hnrwagner10 күн бұрын

  Different abaqus, pc, mesh, could be many reasons

• 
  @user-vp6sq4kb9l15 күн бұрын

  Hello, dear Dr. Wagner. I performed a buckling analysis with triangular loading on the left and right edges of a rectangle plate by the Px(Y)=P0*(1 - alpha*(Y/b)) function with a force magnitude of 1. How can I calculate the required buckling load from the obtained eigenvalue? P0 = 1 alpha = 1 b = 500

• 
  @hnrwagner16 күн бұрын

  reference for the video: www.sciencedirect.com/science/article/pii/S0029549314001885

• 
  @mubaraks740018 күн бұрын

  Why it is only applicable to ductile material? If there any way to find fracture energy of concrete from stress strain curve!? Thanks in advance

• 
  @hnrwagner17 күн бұрын

  Havent seen the video in a while did I say it works only for ductile damage? should work for every material model if you know what you do

• 
  @user-vp6sq4kb9l21 күн бұрын

  Hello dear Dr, thank you for your useful videos, I have a question. Is there a way to get the area under the buckled plate in Abaqus software?

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  @hnrwagner21 күн бұрын

  what do you mean with "get the area" ?

• 
  @Daikailovezombie23 күн бұрын

  I have a question about the stress triaxiality when you set 0 and when you set 1/3 for uniaxial tension

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  @hnrwagner22 күн бұрын

  it only works if you have at least two values, so only 0 or only 1/3 makes no difference

• 
  @joaovictorsantos566023 күн бұрын

  Great explanation Dr. Wagner. Could you show your "steps" configurations? Did you set Non-lineartity on?

• 
  @rahuljws709025 күн бұрын

  for me, linking part is done and is showing in info, but verification procedure is failed. how can i solve this? please help me out with this

• 
  @SandyTalks..26 күн бұрын

  Sir, can you please make a video on material models for asphalt materials using Prony series, Burger parameter and others.

• 
  @alkissideris85127 күн бұрын

  Hi Dr. Wagner, Great video once again! Thank you very much for all of the content you share. I am trying to use a VUMAT in my own analysis and I am encountering a compilation error due to "Cannot open include file 'vaba_param.inc' ". Do you know how I can solve this issue?

• 
  @hnrwagner27 күн бұрын

  Did you test my example with the cfrp tube and got the same problem?

• 
  @alkissideris85125 күн бұрын

  @@hnrwagner Hmm no I didn't, probably I should do that as a verification if there is something wrong with my code or my compiler.

• 
  @vincaldhool945328 күн бұрын

  slide @ time 2.11 shows stress = 273MPa on graph but in damage computation you use stress = 237MPa ? Is it a typing mistake or is there another reason

• 
  @hnrwagner28 күн бұрын

  its a typo,thanks

• 
  @marianop.ameijeiras515729 күн бұрын

  Many thanks for sharing your knowledge and experience.

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  @hnrwagner27 күн бұрын

  Thanks

• 
  @drury2d8Ай бұрын

  Dr. Wagner, can we use shell elements while evaluating triaxial stresses in thin metal sheets or foils?

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  @hnrwagner27 күн бұрын

  Yes but than only for a non 3D case

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  @ParameswaranPed22d008Ай бұрын

  Thank you. Its very helpful

• 
  @emmme7838Ай бұрын

  Thank you very much sir, i find your tutorials very useful.

• 
  @kitty861987Ай бұрын

  Dear Sir, It is a very nice video, thank you very much. Can you provide the Abaqus input file again, the attached link is not active now.

• 
  @hnrwagnerАй бұрын

  will add it again in June, currently still in paternity leave

• 
  @hnrwagner5 күн бұрын

  The Python Scripts for the Tower Analysis can be found here: github.com/hnrwagner/Round_Robin_Wind_Turbine_Tower

• 
  @kitty8619872 күн бұрын

  @@hnrwagner many thanks Sir!

• 
  @muhammadfadhlanafif3133Ай бұрын

  I found that there is damage evolution option in JC damage model. Could you elaborate more regarding this? Thanks

• 
  @ZiemzyOGАй бұрын

  Very informative, I am trying to do a low velocity impact analysis on a composite plate but for some reason my jobs abort whenever I select the hashin criterion in the field output. I also select the previous damage criterion in the field output but after my job run it does not show any results for those variable. No Idea why this is the case..

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  @hnrwagnerАй бұрын

  sounds like the elements you used dont support Hashin, which kind of elements do you use?

• 
  @ZiemzyOGАй бұрын

  @@hnrwagner I was using SC8R element (8-node quadrilateral in-plane general purpose continuum shell, reduced integration with hourglass control and element deletion on)

• 
  @ZiemzyOGАй бұрын

  I did create a 3D deformable solid for the plate and then assigned a continuum layup and continuum shell element

• 
  @mamdosein5207Ай бұрын

  Dear Dr. Wagner I hope everything is going well with you. Thank you for your informative and comprehensive videos. I have a question; could we calculate the strain rate from the machining process like the proposed video? based on RF and U of nodal displacement of a single element in the chips? or is it possible to activate one of the field outputs like PE or LE or NE to get the strain-time graph? Thank you for your help and time.

• 
  @AbubakrESMusaАй бұрын

  Dear Dr. Wagner, Could you please verify the obtained buckling stress for the same problem with any source (experimental or any formula from the literature)? I have tried to verify with formulas from the literature, but the answers are in the range of 13 to 14 kPa, where as your answer is 20.5 kPa.

• 
  @hnrwagnerАй бұрын

  see at 19:40, its actually pretty close to the test, but I will check some analytical equations

• 
  @AbubakrESMusaАй бұрын

  @@hnrwagner Thanks for your feedback. The comparison you made at 19:40 is very interesting. Please let me adopt it for more discussion. Since the elastic formula you used at 18.42 is based on the elastic material property, and usually small strains and perfect shell, it should be compared with the case of LBA. Suppose that I do not have Abaqus, how I can estimate the buckling pressure? I will just use the elastic formula (to get the 0.0138 MPa) and multiply it by the KDF (say 0.9). So, the question is how the elastic formula is greatly varying from the LBA (0.0138 vs 0.0203)? I have used different formulas for comparison including the exact solution and they mostly in the range of 0.013 to 0.014 MPa. This made me in a doubt about the accuracy of Abaqus in this kind of problems. How do you comment on that? I have another question but that is related to the article you adopted, their values are overestimated by 10 times. For example, the results of the elastic formula they presented in Table 6 of the paper is 138.2 kPa (or 0.138 MPa), which is ten times the value you presented (and yours is correct).

• 
  @mohammadalaynia560626 күн бұрын

  @hnrwagner Please verify these results, regards

• 
  @hnrwagner26 күн бұрын

  @@mohammadalaynia5606 In Python code with results L = 1250 R = 500 t = 1 E = 210000 v = 0.29 P_nasa = 0.926*E/((R/t)**2.5*(L/R)) P_ven = 0.92*E*t/L*(t/R)**1.5 print(P_nasa*1000,str('kPa')) print(P_ven*1000,str('kPa')) 13.91 kPa 13.82 kPa same results as in the video @ 19:18 looks like my numerical results overestimate the buckling pressure, not sure why, maybe the boundary conditions are wrong, but the test loads are also very high 18.4 kPa

• 
  @AbubakrESMusa26 күн бұрын

  @@hnrwagner Thanks for the double check. Actually, your numerical solution seems perfect. I have solved several problems independently and I always find the LBA about 42% of the analytical one. It seems like it is an issue with Abaqus. I will try to see if I can simulate it in another FEM software. If I am able to reach to a solid conclusion, I will share it with you.

• 
  @helpingwithprojects5251Ай бұрын

  Sir please mame a vidoe on shear defecient beam under three point load

• 
  @amirnasirmanesh6049Ай бұрын

  Amazing example! Which one is closer to reality? Static or Dynamic?

• 
  @hnrwagnerАй бұрын

  Dynamic case is closer to reality, we performed tests who show similar behavior than dynamic simulation www.sciencedirect.com/science/article/pii/S026382311931835X

• 
  @mahfoudhtaleb-ali6617Ай бұрын

  it doesn't work for me. Abaqus 2020, Intel one toolkit 2024, and visual studio 2019.

• 
  @hehe19001Ай бұрын

  Verify test : Abaqus/Standard with user subroutines verification .. log located at C:\temp\verify\user_std\user_std.log result : ERROR : Abaqus/Standard with user subroutines verification What can be the reason for this.I installed vs2019+base and hpc kit 2024+abaqus 2023?

• 
  @mahfoudhtaleb-ali6617Ай бұрын

  Abaqus2020, Intel one API2024.1.0 and VS2019

• 
  @rahuljws709025 күн бұрын

  same problem. same error i am getting. with abaqus 2023

• 
  @generalCAE_Ай бұрын

  Very nice tutorial. It looks like the report link is not working anymore. Does anyone knows where to find it? Thanks!

• 
  @amrelsafoury5190Ай бұрын

  brilliant work professor

• 
  @kar-dt1hkАй бұрын

  thank you sir for this innteresting video,sir i have one question about riks method, sir i have modeled hollow sphere under internel pressure uding hyperfoma material, my problem i dont know how plot pressure fonction deformed raduis ,and i need the curve after reache max pressure decrases

• 
  @untacoenluxemburgo9387Ай бұрын

  Hello, What happened with all your videos? you had really amazing material...

• 
  @hnrwagnerАй бұрын

  They will be released later this year again, they will be remastered, better sound and so on

• 
  @untacoenluxemburgo9387Ай бұрын

  @@hnrwagner Awesome, thanks a lot for your contributions!

• 
  @ozlemkaradeniz7442Ай бұрын

  Dear Dr Ronald Wagner, I was very sad that you removed some of the videos.

• 
  @hnrwagnerАй бұрын

  They will be reuploaded later this year, I will remaster them

• 
  @shxuefaАй бұрын

  It's that you divide the boundary conditions into a lot of disp-bc-1,2,3...each disp-bc only limits one degree of freedom, why not limit all the degrees of freedom in one disp-bc?

• 
  @hnrwagnerАй бұрын

  You can do it this way or the other, it makes no difference

• 
  @AshwaniKumar-ne7oeАй бұрын

  For AMD processors: Replace the keyword intel64 with amd64. Thanks Dr. Wagner for the helpful video !

• 
  @yasserhamed6930Ай бұрын

  I have AMD Rayzen 7 processor but I still not able to link it

• 
  @Henriquesf769Ай бұрын

  @@yasserhamed6930 Same, the Fortran compiler is recognized by Abaqus, but the verification fails and no std_user.log file is generated

• 
  @karun71362 ай бұрын

  Sir... should we use true stress value in yeild stress column plastic property or else we can use the engg stress

• 
  @saiabhishek23202 ай бұрын

  Great video Prof. I have a doubt. I am modelling a material which is linear-elastic, perfectly plastic and undergoes instantaneous damage. But the problem is the material undergoes larger values of elastic strains, almost till a strain of 150%, it remains in elastic region. So can this code be used for the doing the same? (I have to use ductile damage model)

• 
  @user-fd4jh9qx8y2 ай бұрын

  Make some video on VUMAT

• 
  @hnrwagner2 ай бұрын

  There is one video on vumat already, what do you have in mind

• 
  @chillwithmonkey67792 ай бұрын

  thank you!

• 
  @hnrwagner2 ай бұрын

  A pleasure

• 
  @user-yf9wz8dk4w2 ай бұрын

  I have done the same analysis for my problem but after submitting it is showing job LBA aborted due to errors. Kindly help

• 
  @reginawagnerbiolife78672 ай бұрын

  What is the error message

• 
  @hnrwagner2 ай бұрын

  what is the error in the job message center?

• 
  @user-ls9ss4pi9h2 ай бұрын

  Hello Professor! First of all, I gained a lot from watching your video, thank you! However, I realized that the selection of mesh type is not involved in the subroutine. If I want to use different types of meshes to compute a model through the subroutine, where should I declare the mesh type. Is the interface of this subroutine itself limited to the type of mesh?

• 
  @hnrwagner2 ай бұрын

  should work with most elements (no reduced integration) there is also a video on how to use the UMAT with shell elements

• 
  @user-ls9ss4pi9h2 ай бұрын

  @@hnrwagner OK, thank you, Professor. I will keep learning.

• 
  @MrPuopa2 ай бұрын

  Thank you very much for the helpful video! I had some problems after following the presented procedure but was able to solve them. These tips might be helpful to some of you as well: 1. Make sure you have also installed the SIMULIA Established Products CAA API for the Abaqus (including the hot fix) version you have 2. If you are seeing the Abaqus solver abort immediately with some user subroutines, you will also need to add the following line to the abaqus_v6.env file: link_sl='LINK /NODEFAULTLIB:LIBCMT.LIB /dll /def:%E /out:%U %F %A %L %B'

• 
  @hnrwagner2 ай бұрын

  thanks

• 
  @refquesog8104Ай бұрын

  Thank you very much.

• 
  @rahuljws709025 күн бұрын

  still i am facing error with this recommendation. I am trying to link the fortran with abaqus2023. linking part is ok. but verification part failed and giving errors. this is the error Verify test : Abaqus/Standard with user subroutines verification .. log located at C:\temp\verify\user_std\user_std.log result : ERROR : Abaqus/Standard with user subroutines verification ------------------------------------------------------------ Verify test : Abaqus/Explicit with user subroutines verification - 'Abaqus/Explicit single precision user subroutine' Failed. - 'Abaqus/Explicit double precision user subroutine' Failed. .. log located at C:\temp\verify\user_exp\user_exp.log result : ERROR : Abaqus/Explicit with user subroutines verification linking part C++ Compiler: Microsoft Visual C++ 14.39.33523.0 Linker Version: Microsoft (R) Incremental Linker Version 14.39.33523.0 Fortran Compiler: Intel Fortran Compiler 2021.12 MPI: MS-MPI 10.1.12498.18

• 
  @MrPuopa25 күн бұрын

  @@rahuljws7090 Did you run the verification and "info=system" with the same command? Do the other Abaqus verification jobs pass? I have this working on abq2023hf7 with almost identical linking part info to yours but the C++ compiler / Linker versions are 14.29.30154.0

• 
  @titorotod2 ай бұрын

  Hi I've tried everything but I keep getting this error for subroutines: ifort: command line error: no files specified; for help type "ifort /help" Abaqus Error: Problem during compilation - std_user.for Abaqus/Analysis exited with errors Any ideas?

• 
  @hnrwagner2 ай бұрын

  Looks like u have not installed a compiler

• 
  @palashdas8232 ай бұрын

  Hello Sir. Can i use this same vumat without any editing for dynamic,disp-temp, explicit analysis? For cylindrical object under thermo-mechanical environment

• 
  @hnrwagner2 ай бұрын

  should work, please try and let me know

• 
  @palashdas8232 ай бұрын

  @@hnrwagner Thermal properties (K,alpha,Cp) should be given in VUMAT , along with constitutive law . am right? my another question is in dynamic explict analysis i have found total energy is negetive . Is it possible ? I have tried with dynamic,explicit and dynamic,temp-disp,explicit same thing happened. Can you explain it

• 
  @palashdas8232 ай бұрын

  Hello sir, I have a question related to dynamic explicit. I am trying to model FGM spherical pressure vessel in abaqus where in monitor it is showing total energy is negative. Can total energy be negative?

• 
  @hnrwagner2 ай бұрын

  Sry, don't know