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Ehsan Sadeghi
Spain
เข้าร่วมเมื่อ 5 พ.ย. 2012
Coupling constraints in ABAQUS. Kinematic vs Distributing
Coupling constraints in ABAQUS. Kinematic vs Distributing
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The three point bending flexural test provides values for the modulus of elasticity in bending and the flexural stress-strain response of the material. The main advantage of a three-point flexural test is the ease of the specimen preparation and testing. However, this method has also some disadvantages: the results of the testing method are sensitive to specimen and loading geometry and strain ...
Cold Gas Spraying Coating (CGDS) - Abaqus
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Cold spraying is an emerging coating process in which in contrast to the well-known thermal spray processes such as flame, arc, and plasma spraying, the powders do not melt before impacting the substrate
Seismic/Abaqus
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Seismic Analysis of 20 Storey biulding Dynamic Implicit solver-Abaqus "scale factor=10" e-sadeghi@hotmail.com 98 933 10 100 69
Creating Infinite Elements in ABAQUS
มุมมอง 20K9 ปีที่แล้ว
In this video you will learn how to create infinite elements with a simple tricky way. Please share your comments with me and if you have any question i am pleased to answer.
So what is the difference?
no analyse of the results... explication ??
Hello, if I want to simulate soil structure interaction, the infinite elements don't need to be set up on the top and bottom of the model? Only the lateral sides need to be set up?
is it possible to create infinite element in Abaqus explicit? if possible, how can we model? i am modelling liquid storage tank with soil structure interaction.
Hello I am trying to simulate thermal spray coating, need your help if you have tutorial for beginner?
NO BULK MODULUS IS DEFINED FOR ACOUSTIC ELEMENT'' i get this error when I try to analyze my problem, and I check inp file AC3D8 elements are come back even I change them like you did in video, is there a solution for this?
Hi sir, if I model according to this, what would be the boundary condition between the finite soil element and the infinite soil element? And if I only model 2 infinite soil element (let say along x-axis), what would be the boundary condition of the finite soil element along z-axis? Thank you!
Great video, thank you so much.
*Element, type= search this in input file
CIN3D8
CINAX4
با عرض سلام، خیلی ببخشید جناب مهندس من مشکلی که در مش بندی زیاد بر می خورم ولی نتوانستم برطرف کنم، سه تپه مثلثی شکل دارم که از نوع free و Quad با سایز مش مثلا ۱۰ یا ۸ مش زدم و وریفای میکنم مشکلی نیست ولی بعد از اعمال المان بینهایت(اصلاح فایل inp به cinpe4 و ایمپورت ) اندازه های مش کم و زیاد میشه، چرا؟ و بعدش تحلیل دینامیکی خطا(مربوط به نامناسب بودن مش) میده!! چه باید کرد؟ پارتیشن بندی میکنم و سایز مش ریزتر میدهم باز خطا میده!! ممنونم راهنمایی بفرمائید
I D ONT FINE THE OUT PUTE FILE I CANT CHANGE ELEMENT
Respected sir, How to apply simultenous horizontal plus vertical ground motion earthquake load case in Abaqus?
Sir can you please guide me details of this tutorial. I am trying to know the adhesion between the steel substrate with magnesium powder.
I'm also having same project al coating on low carbon steel. Email: bday7aug@gmail.com
Can YOU help me SIR ? For solid pipe(C3D8R element) how to assign infinite elements to a solid pipe?
que interesante!🤗🤗
nice video bro 👍
what element did you use to make sure that euler bernouli beam type analysis is done?
can we make seismic velocity modeling using ABAQUS??????
sir, m doing my m tech dissertation work and kinda stuck in ABAQUS simulation... please make a video on bolted beam-column joints with bolts(probably blind bolts) explaining interactions in it...i am not getting any idea how to proceed please explain interactions for bolted connections
sir can u help me on load settlement curve ,of a soil model, my mail id: baishalitushi@gmail.com
Can I use infinite element in thermal only analysis ?
@Ehsan Sadeghi This user uploaded your video- th-cam.com/video/asr9fM8kJNE/w-d-xo.html
Hi. How would you display bending frequencies or mode shapes in the visualization?
Thank you for the video!!!
Heya, I'm simulating silo in Abaqus of cement stored material, I can't figure how to fill cement material in it ...! can anyone suggest me plz....!!!
you have to section the parts and define different material properties for each part. it is the simplest way. however if you want more accurate model you need to define the composite properties and interaction between different material
Hi Sir, I am trying to simulate cold spray using Lagrangian and CEL Model. My particle is solid sphere with 12micron radius and substrate is cylinderical with 125 microns radius. Impact velocity is 700 m/s and I am using Johnson and Cook Plasticity model. Can you please guide me in above simulation. Thank You
Hi. How can i help you?
@@ehsansadeghi4486 Actually I am not able to get the proper simulation results. I would like to email you my problem in depth and also the results that i expect. Can i Email you. This work is part of my masters research. Thank You
@@amoghshejwal7472 yes please send me an email
when i start analysis this massage come NO BULK MODULUS IS DEFINED FOR ACOUSTIC ELEMENT 5313 INSTANCE soil base how can i solve these problem
I'm facing the same problem
@@daniloper1 i solve these problem in defining material go to other bulk modulus bulk modules K = E/3(1-2v)
thank you for your help. Saddly, I didn't make this thing work. I define two kinds of materials, one for the finite elements (without bulk modulus) and other for the infinite elements (only with bulk modulus and density,). So, I followed the tutorial and this new error appeared: AN ACOUSTIC MEDIUM IS DEFINED FOR ELEMENT <Numbers of elements> INSTANCE <Name of Part> ONLY ACOUSTIC ELEMENTS MAY HAVE THIS MATERIAL PROPERTY. Do you know something about this?
@@daniloper1 Are you using CIN3D8? this element is not acoustic
How would you model a Timoshenko beam where you have to take into account shear/rotational inertia?
Thank you sir <why the corner of soil without infinite boundary
I am using arbitrary lagrangian eulerian(ALE) and plastic deformation of the material is modelled with Johnson cook plasticity model.
And also lagrangian algorithm approach
There should be some problems using ALE in impact analysis. I would recommend you to use Eulerian approach. In Lagrangian method, because of high deformation of elements you will not get accurate results.
sir, i am doing cold spray problem with dynamic temp-disp and there is an error "Degree of freedom 11 and at least one of degrees of freedom 1 thru 6 must be active in the model for *dynamic temp-disp. Check the procedure and element types used in this model". can you please help me to fix it.
Sir, I am doing good impact problem(impact ofcopper particle on copper substrate and deformation of particle and substrate both ) in which I am trying to do a 3D modelling in which computational time is about 100nanoseconds with dynamics explicit procedure. General Contact is taking in the problem and meshing resolution is about 1/diameter of particle. In this problem about 5 micrometer clearence is taking between particle and substrate. Velocity of particle are 500,700m/s. Particle diameter 50 micrometer and substarte is 0.625*0.625sq meter.. Shape of particle is quarter of sphere(solid). Kindly help me sir. I shall be very thankful to you.
Do you use Lagrangian or Eulerian approach for impact analysis? what is your plasticity model?
Hello sir, my dissertation is on cold spray. I am not able to model it properly and also there is no proper tutorial of it. Kindly help me sir. Can I contact you through mail(e-sadeghi@gmail.com) if you don't mind.
please be more precise about you problem. how can i help you?
hello sir can u share video tutorial. i work on 3 point bend test of acralic.
HI Mr Sadeghi.Thanks for your great video.I have tried the procedure exactly and could generate infinite elements properly but I got following error in pre-process step and I do not know how to eliminate that.I appreciate any help. THE FACE S5 IS NOT VALID FOR THE UNDERLYING ELEMENT 8159 INSTANCE soil nnn-1 IN *SURFACE ASSEMBLY_soil nnn-1_SURF-LAYER3-INF
Hi can you please share the full tutorial of this video? I am doing a 3-point bending analysis of a glass fiber/vinyl ester composite short beam using hashin failure criteria in Abaqus in order to validate my experiment but I am keep getting an error message. As I am new in abaqus I dont know where is the problem. I have the data of the lamina so I am using a deformable shell part for the specimen. I have used Static Explicit then Dynamic Explicit but same problem. Also I have tried to find on youtube a full video of this test involving hashin failure criteria but it's very difficult. Can you please help me? Thanks.
contact me by email. e-sadeghi@hotmail.com
hi iam trying to model cold spray but there's no tutorial can you please assist me? I have sent you an email!!
Thank you for the video. It is possible to modify in the input file the element type because the AC3D8 have the same number of nodes as the CIN3D8. what if i want to use the quadratic infinite elements CIN3D12R or CIN3D18R? and does the thickness of the infinite media have influence on the damping?
what you want to try is somehow double precision in results. personally i haven't tried to that in a project because 8 node elements seemed to be satisfactory, but from technical coding point of view it is possible. try it. the method that i have introduced is some kind of trick.
an about thickness! i can say no, unless you make your boundaries suitable enough for damping. the overall prospect is having high aspect ratio in infinite element
Hello, I have some questions about your video 1. Are you using Dynamic Explicit? 2. What material do you use for the deformable shell? 3. What kind of force or displacement or velocity do you use for the top rigid? 4. Why does your time period in step just have only around 0.07 seconds? It really make me wonder, because I think that scenario doesn't exist in reality or I get something wrong with simulation. 0.07 is less than a wink of human. Hope to hear from you soon Thank you so much
Hi. Thanks for your message. Problem was solved by Explicit solver of Abaqus. 0.07 seconds is somehow artificial time for this problem. increasing time step would lead to more statically determined solution for this simulation, however it will increase computational time of simulation. Good balance between choosing appropriate time step and results can be carried out by analysing Energy quantities. both BC condition can be used, however using displacement BC would make more physical sense. choosing time step requires wise selection and it is somehow problem of trial and error to pick suitable time step. Time step here doesn't demonstrate real time of bending, rather it has a computational point of view.
I've just been doing some assigments with Abaqus/Explicit recently. When simulating impact between a rigid body and a deformable one at high speed, I set the time period short, It is understandable. But when I was doing Deep Drawing (the time period must be over 2 seconds, I assume), It looks like Abaqus/Explicit doesn't let set time period over 1 seconds, because there were always errors when I summited. On the contrary, Abaqus/Standard seem to let us set time period pretty long. Time period in step really confused me some way If possible, could you clarify it for me? I really appreciate it.
There is a difference between Static(or quasi-static) and Dynamic problems that are solved with Explicit solvers. Normally in static problems time step is artificial. it must be big enough to allow static determination of problem, while in Dynamic problems like impact, it must be real time. However in most cases big time steps result in long computational effort. Therefor using Mass-Scaling factors are recommended (with caution!) in these kinds of problems .
Thank you for your explanation Just one more question. In incrementation tab of Static, General type. there is increment size with Initial, Minimun and Maximun. What do they mean? I basically leave it as default when doing Static, General
incrementation is same as "dt" in differential equations. loosely speaking, as much as dt is small, finer and more precise answer we have. however these incrementation have specific limits.
Thank you for the video sir.. I am trying to create infinite elements for a layered structure with different geometry but unable to do so. Can you please provide some help?
Hi thanks for your message. You'd better to follow the instructions in the video and you will be able to create your infinite elements.
I have tried this sir but the since the geometry is different it's not coming on all sides. I'll share the details of the section if you provide me with your email id. My id is vidhivyas.29@gmail.com Thank You
it is ok. email me: e-sadeghi@hotmail.com
sene me email e-sadeghi@hotmail.com
Thank you for the help sir.
Hello! I was wondering how you make the modeling of of the impact? I am making the modeling of a particle impacting a substrate and have no idea how to procede. You'd insight would be welcome!
You must clarify which regime of velocity impact is it? High velocity or low velocity? Does material undergo extensive plastic deformation or not? and what kind of contact behaviour is in the interface? All these questions must be answered in order to clearly model the impact analysis.
The velocity im using is between 400-600. Well, it should shouldn't it? For there to be a bonding. Actually the contact of the elements is were I have the problem. Would you mind giving me your email or somewhere I can contact you?
Ok. You are modelling Cold Spray not contact in general. right? It is a little bit tricky to define contact interface. sometimes it is process of trial and error! This is my email, feel free to contact. e-sadeghi@hotmail.com Best
Perfect , useful ......
Thank you for this video! I want to study a soil-structure interaction during an earthquake, I think that Infinite elements are a good tool for this purpuse! About the boundary conditions, should I assign only an acceleration to the bottom of the model? Should I assign any BCs to Infinite elements? If the soil is non-linear, how infinte element behave? Thank you =)
Hi, I would recommend you to read fundamentals of FEM before using any FE Solver. Infinite Elements are working as a boundary conditions (roughly speaking) and is not needed to assign other Bfs to constraint the nodes. Acceleration should be assigned to solid bed, i.e bottom of the soil medium. This acceleration should be evolved till surface of the soil. Be careful about using the correlated acceleration data. Should you have any further questions, don't hesitate write in comments.
Ehsan Sadeghi thank you!
@@stefanodalerci6149 please did you use CIN3D8 element? I have question about it
dear ehsan I do a same work for 2D infinite element but when i input the inp file, i faced with an error: "The model "Job-1" has been created. AbaqusException: in keyword *ELEMENT, file "Job-1.inp", line 229: Element type "CIN2D4" is not supported. This occurred while parsing the input file. Run the input file through the batch pre-processor to check for syntax errors. The model "Job-1" has been imported from an input file. " please help me thenk you
Did you resolve your problem?
Hello may i know how u did this simulation starting from scratch ? starting from modelling and all. I need a tutorial for my final year project. thank you !
You must clarify which regime of velocity impact is it? High velocity or low velocity? Does material undergo extensive plastic deformation or not? and what kind of contact behaviour is in the interface? All these questions must be answered in order to clearly model the impact analysis.
great work can you sen me the CAE or INP file.please i need it please my email: ehajian0@gmail.com
dear ehsan, what will happen to waves striking at any corner? will they reflect ??
no they will be absorbed! which is the effect of infinite elements!
i mean corner of finite domain as there are no infinite elements diagonally..
because we have defined infinite elements in horizontal axis, consequently x-component of wave will be damped. If damping in y-direction can not be ignored . you must define infinite elements in x-y direction.
thank you very much
DEAR EHSAN IS THIS METHOD CAN BE APPLIED ON 2D DIMENSION
+Harith Basim Yes of course
may you sent to me the CAE file, it will help me more, thanx alot mohamed1982dh@yahoo.com
Unfortunately I can not send you the abaqus file. but in case you need any help i will be glad to help you.
hi, I am also a student from University of adelaide and currently working on seismic analysis using ABAQUS. Can you send me the CAE file.that will be great appreciate with your help, sir. Thanks
My email address is henrychin1991@gmail.com
Unfortunately I can not send you the abaqus file. but in case you need any help i will be glad to help you.
Unfortunately I can not send you the abaqus file. but in case you need any help i will be glad to help you.
Dear sir, i am also working on similar project .please send the CAE fileIt will help me a lot my mail ID : lakshmikantseth@gmail.com
Unfortunately I can not send you the abaqus file. but in case you need any help i will be glad to help you.