Hi, In my analysis, I used a moving pressure (did not model the tyre) on a road section. However, when I use dynamic implicit steps, I see oscillations in my deflection profile. I cannot seem to find the error in my subroutine file. Do you have any idea about this?
hi. maybe only the elastic deformation occurs during the analysis or major of the deformation is in the elastic region that will be removed after the passing of the load. also you can do the simulation using the static general step to check whether the oscillation is because of the inertial effects or not.
I created a model that imitated yours, but "Surfaces which include edges cannot be used with * contact pair” is displayed and it cannot be analyzed. What should I do?
hi. I have not seen such error before. in these cases, you must send your model to be checked. then I can find the mistakes and give you the solution. this is one of our paid services.
yes. in the recent years, because of improvements in computers, analysis of moving loads is performed more than before. so the fatigue life of structures like bridges and railways can be calculated more accurate than before.
hi. the velocity of the vehicle is an input to the problem and is known. the angular velocity of the wheels are calculated according to the no slip assumption.
@@ごりごりあん yes it is. if you want to model the wheel, you must use this equation for finding the angular velocity. but if you want to use subroutine, there is no need for finding the angular velocity.
@@FemexIran In addition to using the DLOAD subroutine, you also do it by modeling the tire, right? In the latter case, what are the material properties of the tire?
@@ごりごりあん those problems are not related to each other. in that example I didn't model a tire. it was just a moving rigid body for the illustration of this method.
Good example to show the way of moving load simulation in Abaqus. Thank you Mr Mirzabozorg!
Hi.
You are welcome.
Thank you very much for your great explanation.
Hi, In my analysis, I used a moving pressure (did not model the tyre) on a road section. However, when I use dynamic implicit steps, I see oscillations in my deflection profile. I cannot seem to find the error in my subroutine file. Do you have any idea about this?
hi.
maybe only the elastic deformation occurs during the analysis or major of the deformation is in the elastic region that will be removed after the passing of the load.
also you can do the simulation using the static general step to check whether the oscillation is because of the inertial effects or not.
I created a model that imitated yours, but "Surfaces which include edges cannot be used with * contact pair” is displayed and it cannot be analyzed. What should I do?
hi.
I have not seen such error before.
in these cases, you must send your model to be checked. then I can find the mistakes and give you the solution. this is one of our paid services.
This is an important field like rotating bending fatigue test
yes. in the recent years, because of improvements in computers, analysis of moving loads is performed more than before. so the fatigue life of structures like bridges and railways can be calculated more accurate than before.
Is it possible to create a beam as a wire part instead of a solid part and do the same analysis?
yes. it is possible. beam elements must be used.
the computational time will decrease too.
How did you decide the magnitude of velocity and angular velocity?
hi.
the velocity of the vehicle is an input to the problem and is known.
the angular velocity of the wheels are calculated according to the no slip assumption.
@@FemexIran Is v = rω okay, assuming no slippage? Where v is velocity and ω is angular velocity.
@@ごりごりあん yes it is. if you want to model the wheel, you must use this equation for finding the angular velocity. but if you want to use subroutine, there is no need for finding the angular velocity.
@@FemexIran Thank you for your answer.
@@ごりごりあん your welcome.
How to model a cyclically moving wheel?
hi.
you can define a cyclic amplitude for the horizontal displacement of the wheel in a single step.
@@FemexIran thanks sir!
@@matsualaidrus8173 you are welcome.
Do you give the tires density?
hi.
in this project I used DLOAD subroutine.
when we use subroutine, there is no need for defining the tire and its density and ... .
@@FemexIran In addition to using the DLOAD subroutine, you also do it by modeling the tire, right? In the latter case, what are the material properties of the tire?
@@ごりごりあん those problems are not related to each other. in that example I didn't model a tire. it was just a moving rigid body for the illustration of this method.
@@FemexIran Is the tire made as discretized rigid body?
@@ごりごりあん the tire can be modeled as a discrete rigid too.
Could you give me your cae file?
yes of course.
it's cost is 10 US dollars that must be paid by paypal. for getting the payment details, please send email to mirzabozorg71@gmail.com
Can you please give your email i
hi.
my email is: mirzabozorg71@gmail.com