main tensions - spring elements creation

[netstorm]

Hi, two questions I think fast, but they're at first.. .soever I wanted to know how to create elastic elements, soft type, i.e. properties I have to set, etc.

among all contour options I find which are the 3 that describe the three main tensions? I need to use the sines criterion

Thank you.

 

[lunetta]

I tell you how it is for the gaps that are many similar.(Now I can't control the springs because I'm running an analysis)
1)create the property:go on properties(with the pointer on created), write the name of the property for example pmolla.click on type and select spring-gaps.su card image select pelas and create-edit and change it as you need.
2)create the component "mode" and be careful that the current element remains
3) go to 1d panel on spring and create springs.

to know which fields to select start from the help and search pelas from there you will have all the links that will tell you everything you want on the springs!

 

[netstorm]

Since I opened the discussion I had updated myself on some things, I understood how to make the spring elements, in practice I create the property with card image pelas, I put the stiffness and check the property to the spring collector... .
What is not clear to me is how to "direct" the springs, I do not know if it is the same as the gap, but in practice I did not align them with any axis of the reference system, and of course I would react only in the own direction, but I do not know which dof to choose. . . .

the main tensions I also believe to have found them, there is p1(major), p2(mid) and p3(minor)

another student!

 

[lunetta]

I did not understand well what you mean by own direction.cmq springs being 1d react to traction and compression only in one direction.if you did not specify a reference system is the main one.
For the rest I can't tell you anything else I would like my gaps at least to react somehow instead they are very passive!! !

 

[netstorm]

I did not understand well what you mean by own direction.cmq springs being 1d react to traction and compression only in one direction.if you did not specify a reference system is the main one.
For the rest I can't tell you anything else I would like my gaps at least to react somehow instead they are very passive!! !

I try to explain better, when you create a spring element asks you on what dof you want to apply stiffness then dof1=axis x, dof2,3=assi y,z and dof4 to 6 are the moments, these axes are those of the global reference system

My spring is between two knots I created and is not aligned to any of the main axes, so you think I have to create a reference system and then specify its axis based on that?

 

[lunetta]

I'm afraid of you in the sense,that at least for the gap works so.that is if the allineum the gap we put with the x axis and then I apply a stress not aligned to a axis but we say randomly he will resent it only in part or only for the force component that brings it to compression.
I don't know if I understood the problem well, I hope so!

 

[Pakopako]

hi netstorm, then regarding the celas elements in nastran are simple spring-damper elements, which react with the stiffness k1 (assigned by you in the pelas card) along the x local direction of the element, that is along the direction connecting the two knots. the speech is slightly different if the two knots are overlapped. if you need spring-damper elements with stiffness-smoking in 3 directions, then you can use cbushs. I hope I've been helpful, bye