I Adhesive Collision: Coding for Sticky Objects

[Hyperbolu]

I am trying to code collision of two objects. When they collide, instead of rebound or motion of them according to their velocity, i want them to stick together and move in direction of resultant normal velocity. It is not plastic collision. I want a force that stops the rebound. how can i proceed with this. I tried using linear spring dashpot model and making the normal impact force 0 by adding equal in magnitude an opposite in direction force but even if the normal impact force is zero. objects still keep moving. Any help is highly appreciated.

 

[PeroK]

You mean you want to model a totally inelastic collision?

 

[Hyperbolu]

You mean you want to model a totally inelastic collision?

No it is not totally inelastic collision. If i take inelastic collision then there will be no need of adhesive force. I want that objects to collide, but like mostly they rebound, instead I want them to stick together (because of let's say magnetic force or vander waal force/ formation of some bond) and then keep moving with the normal velocity of system.

 

[PeroK]

No it is not totally inelastic collision. If i take inelastic collision then there will be no need of adhesive force. I want that objects to collide, but like mostly they rebound, instead I want them to stick together (because of let's say magnetic force or vander waal force/ formation of some bond) and then keep moving with the normal velocity of system.

That is a totally inelastic collision. Do you know about conservation of momentum?

 

[Hyperbolu]

That is a totally inelastic collision. Do you know about conservation of momentum?

yes i do know about conservation of momentum. Can you please elaborate why it will be inelastic collision. let's say two chemical globules collide , they are sticky so they adhere to each other on collision but there motion gets damped because of collision but they will keep moving if one has higher velocity than other. So i do not understand that there will be a contact adhesive force as well. Where does it come in picture if we just have inelastic collision?

 

[PeroK]

yes i do know about conservation of momentum. Can you please elaborate why it will be inelastic collision. let's say two chemical globules collide , they are sticky so they adhere to each other on collision but there motion gets damped because of collision but they will keep moving if one has higher velocity than other. So i do not understand that there will be a contact adhesive force as well. Where does it come in picture if we just have inelastic collision?

A totally inelastic collision is, by definition, one where the two objects collide and stick together after the collision.

 

[Hyperbolu]

A totally inelastic collision is, by definition, one where the two objects collide and stick together after the collision.

yes i understand but we usually say that KE is lost in form of heat etc. but if I want to write let's say force balance: fn(normal force) acting on first object = fij(interaction of particle i and j when they collide)+ fa (adhesive force) , so i am asking is that I want to include this adhesive force as well, so how should write the force balance equation when sticking is caused by inelastic collision only. I am sorry if i am not making sense

 

[PeroK]

yes i understand but we usually say that KE is lost in form of heat etc. but if I want to write let's say force balance: fn(normal force) acting on first object = fij(interaction of particle i and j when they collide)+ fa (adhesive force) , so i am asking is that I want to include this adhesive force as well, so how should write the force balance equation when sticking is caused by inelastic collision only. I am sorry if i am not making sense

The force balance equation is Newton's third law. If they stick together then motion after the collision must be the same as before the collision. The internal impulse can be calculated, but the force profile over time is not determined.

 

[Hyperbolu]

The force balance equation is Newton's third law. If they stick together then motion after the collision must be the same as before the collision. The internal impulse can be calculated, but the force profile over time is not determined.

okay i understand.Can you please suggest how i should proceed then? how can i model this problem

 

[Hyperbolu]

The force balance equation is Newton's third law. If they stick together then motion after the collision must be the same as before the collision. The internal impulse can be calculated, but the force profile over time is not determined.

https://www2.msm.ctw.utwente.nl/sluding/PAPERS/2013_Singh_GRMA_v2.pdf i was reading this material