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small diameter thin wall pipe kink calculation
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Posted by: mdgarf

06/27/2010, 09:27:17

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Hi,
I need some help with pipe kink elimination.
Small diameter plastic pipe (0,3mm, wall thickness 30micro) is actually quite flexible, but under certain bend radius, wall crumbles inwards - kinks. I need maximal inner diameter (max 0,4mm), minimal wall thickness, maximal kink resistance for defined material. is there a way how to optimize this?
thanks
mdgarf







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: small diameter thin wall pipe kink calculation
: small diameter thin wall pipe kink calculation -- mdgarf
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Posted by: egsindia

07/04/2010, 22:45:37

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Hello:
Wrinkles are formed on account of strains exceeding permissible limits. A general rule would be to calculate the strain (along bend radius) by calculating change-in-length/original-length ratio and keeping this within material permissible limits. It is really difficult to estimate the radii unless the material data is known and the geometric layout is considered keeping in view the wall thickness.

Regards
Natarajan R
EGSIndia, Chennai








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Posted by: mdgarf

07/05/2010, 02:47:23

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Hi,
thanks for the answer.
Material is the problem, plastic, more than 50% porous and mostly not homogeneous. So I do understand that any calculation is difficult, I was hoping along the lines: smaller radius(better kink resistance) is achieved 0,6*wall thickness, 0,2*diameter, 0,8*material properties. I can not really change material ecept some annealing.., also limited in diameter and wall thickens, but I would know the importance of the parameters.
thanks







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