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I heard this concept has been used before and I became interested in that . But I did not find where it is used.

well all my arguments above about the external sleeve thread was based on the calculations shown in the attached file. I found by kinetic analysis alone that if the pitch in the interior of the sleeve is less than twice the pitch on the outside i could arive at what i am looking for i.e. quick...

if I think the other way around , like I said you about the second configuration where the ideal case would be the pitch of thread on the ext surface of sleeve to be greater than at the internal surface ,turns out if the pitch is very very high it is infact a straight line . so your suggestion...

yes exactly its a one shot application. Once you are done with it ! its finished .. what you mean to suggest is two projections on the exterior of the sleeve which mates with the two female slots on the body (or even a square sleeve) would be better than the cylindrical sleeve with a anti...

hi rb1957, yes I agree that it is difficult to translate the sleeve with blocked rotation, thats the reason I taught of the second config. According to the design, the sleeve has to move for fixed number of rotation of screw and disengage the screw and bore(body) (by moving the sleeve). thats...

hi ted, yes the screw cannot translate. can you explain why you think it cannot work ? if it helps, the sleeve has thread (groove or female) internally as well as externally ..the threads(males) are provided on the bore and screw.

Can anyone give me the reference on how to calculate these kinds of structures, so I can do a detailed analysis of this?

hi rb1975, thanks for showing interest in the post, basically I started off the post by asking a question with basic configuration where the rotation of screw causes linear motion of the sleeve (this happens by blocking the sleeve to rotate by a flat surface on the outer suface). In the second...

thanks everyone for your reply... effectively, the sliding of sleeve occurs when the tangential force overcomes the frictional force. so imagine if the outer surface of the sleeve has threads too and is screwed inside a cylinder having internal threads. So when torque is applied on the screw...

hi , I am a bit confused here and i would like your help here please. I have a classic screw and nut(or sleeve?) system and I have attached a pic of it for your reference. the torque is applied to the screw and causes the translation of the sleeve. I have derived the relation between the torque...

Thanks irq for your reply. I will try and respond to it when I will be on my PC. Normally for a plastic part what is the recommended security factor? Like for ex if we are testing for rupture and the limit is 120MPa , if for example we consider a loading case of 1600N and the max stress is...

like gurmeet said, do you want to understand the position of plastic hinge of a beam? or do you mean a hinge boundry condition at the end of beam?

Hi, can you give me a name of the software that can calculate torsion properties for my section pls? and is it possible to calculate if the section has an insert of differnt properties? thanks

well thanks for your responses, in case if I recognize it as anisotropic , which criterion would you use to dimension the plastic part ? to see if there is a rupture . Anyone has experience in such sort of analysis? thanks

Hi structSU10 , thanks for your reply. I will refer the book you recommended and ask if i get any questions, but i noticed it is for steel structures, will it be valid for plastic structures too? hi desertfox, thanks for your reply too, I will try and sketch a profile to post it here maybe...

thanks again, I always wondered, how would you differentiate if the material is anisotropic and not isotropic? I mean what is the difference in tensile curve I am looking at say +/-20% along the curve (or average of curve!)? or is there a specific method for that?

hi rb1957 Thanks for your reply. Yes I am currently working on chopped short glass fiber reinforcements. I completely agree, I was hesitant to use vonmises in the first place. but what sort of test do you recommend (to check the homogeneity ? ) From what i know chopping of a samlpe injected...

Hi I am currently working on plastic part design (PA6) reinforced by GF 40% . I would like to analyse its structural rigidity in ANSYS . So I would like to know is it appropriate to look at the vonmises stresses. I dont know if i have to consider it as completely isotropic to look at von mises...

Hi I am currently trying to understand the effect of cross section on the torsional resistance of the bar/rod. I know that the moment about XX axis refers to the bending resistance . But I am confused,in case of torsion is it the moment along ZZ which has to be considered or the torsion...