деформация канала

[ИванСРБ85 0]

Я имею вопрос, чтобы спросить

Проблема решить - деформация канала, состоящего из внутренней доли с внутренним давлением 0.5bar, которые являются в большей доле. Между два - давление 0.3bar. Чтобы получить квази статическое решение, должен я включить "weak springs" - "on", потому что иначе я имел "rigid body motion"? Как должен связаться с областью быть определенным , чтобы усилия были правильно переданы между ними?

(face to face,body to body,rough,frictionless ,..)

Я пробую решить это как 3D и с Ansys Mechanical.

[nikalur 0]

Я имею вопрос, чтобы спросить

Проблема решить - деформация канала, состоящего из внутренней доли с внутренним давлением 0.5bar, которые являются в большей доле. Между два - давление 0.3bar. Чтобы получить квази статическое решение, должен я включить "weak springs" - "on", потому что иначе я имел "rigid body motion"? Как должен связаться с областью быть определенным , чтобы усилия были правильно переданы между ними?

(face to face,body to body,rough,frictionless ,..)

Я пробую решить это как 3D и с Ansys Mechanical.

ИванСРБ85, вам срочно нужен репетитор по русскому языку!

[Солнцеворот 207]

ИванСРБ85, вам срочно нужен репетитор по русскому языку!

Иноземец может... из Омерики.

Очень похоже на машинный перевод с английского.

[ИванСРБ85 0]

Можда бих онда требао покушати са српским, руски учим тек од скоро

Имао бих питање да поставим:

Проблем се састоји у следећем: отворени канал који се састоји из 2 дела, мањег у којем је натпритисак 0.5 бар-а и који је ослоњен унутар већег дела канала. У међупростору између два попречна пресека је притисак од 0.5 бар-а. Услед дебљине зидова (самим тиме и веће површине) и профила самог попречног пресека, јавља се сила која изазива кретање елемента. Да ли је довољно за квазистатички услов равнотеже изабрати опцију "weak springs" - "on" и на који начин се дефинише контактни регион како би се оптерећења правилно преносила између два елемента?

Изменено 24 февраля 2011 пользователем ИванСРБ85

[nikalur 0]

Можда бих онда требао покушати са српским, руски учим тек од скоро

ИванСРБ85, where are you from? Let's speak english.

[ИванСРБ85 0]

ИванСРБ85, where are you from? Let's speak english.

СРБ = Србија

No problem we can talk english. I have an open tube of conical cross section consisting of a smaller segment which is supported by a larger one. (through smaller one, which is of a more heat resisting material, there should be passing hot gasses with pressure of 0.5bar, between two there is 0.3 bar ). I would like to know is it the only way to get a quasi-static condition, to apply weak springs option in analysis settings, and what should i do to have properly transmitted stresses from one body (smaller) on to the bigger one.

Изменено 24 февраля 2011 пользователем ИванСРБ85

[YURIS 14]

СРБ = Србија

No problem we can talk english. I have an open tube of conical cross section consisting of a smaller segment which is supported by a larger one. (through smaller one, which is of a more heat resisting material, there should be passing hot gasses with pressure of 0.5bar, between two there is 0.3 bar ). I would like to know is it the only way to get a quasi-static condition, to apply weak springs option in analysis settings, and what should i do to have properly transmitted stresses from one body (smaller) on to the bigger one.

Я перевел его вопрос так (надеюсь, что правильно):

EN>RU: "Никаких проблем, мы можем говорить по-английски. У меня есть открытая трубка конического сечения, состоящая из меньшего сегмента, который поддерживается большим. (Через меньший, который сделан из более жаропрочного материала, должны проходить горячие газы с давлением 0.5bar, между двумя сегментами давление 0,3 бар). Я хотел бы знать, применять опцию податливых пружин в настройках анализа - это единственный способ получить квази-статическом состояние? и что я должен сделать, чтобы должным образом передать усилия от одного тела (меньшего) на большое".

I think you first need to do thermal analysis, and then transfer the temperature field in the static analysis. Contact can be set as bonded (Pure penalty).

"DS will add weak springs for several reasons. First it will add them if it detects that your model is underconstrained. Secondly it will add them if it finds contact conditions other than bonded. This is because although you are specifying no-separation, the parts may still slide relative to one another. Weak springs are added in case you do not provide adequate constraint to prevent free sliding. Assuming you have real life loads and adequate constraints to stop free sliding, the weak springs should have no affect on your answer and the message can be ignored.)", Al Hancq (ANSYS, Inc.)

[ИванСРБ85 0]

I think that part of a problem is with setting a bounded connection. Say i put the same pressure between two segments, same value as inside the smaller one. Because of the bounded connection the smaller segment will deform just by following the deformation of the outer one, which is not true. There will be some very small deformation just because of the wall thickness and stress of course (compression), but it should remain almost without any deformation, since the equality of pressures inside and outside.

p.s. thanks for translation

Изменено 24 февраля 2011 пользователем ИванСРБ85

[nikalur 0]

I think that part of a problem is with setting a bounded connection. Say i put the same pressure between two segments, same value as inside the smaller one. Because of the bounded connection the smaller segment will deform just by following the deformation of the outer one, which is not true. There will be some very small deformation just because of the wall thickness and stress of course (compression), but it should remain almost without any deformation, since the equality of pressures inside and outside.

p.s. thanks for translation

Not sure that you correctly understood. What is the purpose of your analysis? Are you interested the static strain and stress only or something else? Изменено 25 февраля 2011 пользователем nikalur

[ИванСРБ85 0]

Not sure that you correctly understood. What is the purpose of your analysis? Are you interested the static strain and stress only or something else?

Only static for now. OK i will explain my thinking on more intuitive case. Let us assume there is no pressure inside the smaller cross section only in the space between two. Now the inner segment will be compressed and the outer expanded, and there could be separation of this two. If the contact setting is set on bounded e.g. welded, the inner,smaller segment will not have correct deformation, so i think i should put friction contact between two but i am just trying to check if it is the right way.

[nikalur 0]

<noindex></noindex>

is your inner body free floating or have supports to outer body?

Изменено 25 февраля 2011 пользователем nikalur

[YURIS 14]

I think that part of a problem is with setting a bounded connection. Say i put the same pressure between two segments, same value as inside the smaller one. Because of the bounded connection the smaller segment will deform just by following the deformation of the outer one, which is not true. There will be some very small deformation just because of the wall thickness and stress of course (compression), but it should remain almost without any deformation, since the equality of pressures inside and outside.

p.s. thanks for translation

I think that the thermal expansion of materials will affect the deformation to a greater extent than the pressure.

[ИванСРБ85 0]

<noindex></noindex>

is your inner body free floating or have supports to outer body?

It has constructive supports.

Forget any thermal loading for now.

Изменено 25 февраля 2011 пользователем ИванСРБ85

[nikalur 0]

It has constructive supports.

Forget any thermal loading for now.

<noindex></noindex>

[ИванСРБ85 0]

Not sure that would do the trick, still have to transmit loads from the inner body to the outer one. Like in a sandwich composite structure. I could maybe try with a friction contact between.

[Борман 2 391]

No problem we can talk english. I have an open tube of conical cross section consisting of a smaller segment which is supported by a larger one. (through smaller one, which is of a more heat resisting material, there should be passing hot gasses with pressure of 0.5bar, between two there is 0.3 bar ). I would like to know is it the only way to get a quasi-static condition, to apply weak springs option in analysis settings, and what should i do to have properly transmitted stresses from one body (smaller) on to the bigger one.

Weak spring - it's not effective method. See bellow (my solution)

Don't lead to additional stress.

[ИванСРБ85 0]

It is a good advise, i however have to find out the most suitable settings for my contact region.

Thanks everyone!