stress in pipe
stress in pipe
(OP)
what is the difference between axial stress and longitudinal stress in a pipe under internal pressure? i am always having little confuse between these two....eloborate explanation is appreciable
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RE: stress in pipe
RE: stress in pipe
RE: stress in pipe
circumferential stress acts on the longitudinal weld seam , and has twice the stress value of the above defined axial stress, therefore the longitudinal weld governs the life of the fabricated pipe when fluid pressure is the governing load.
"In this bright future, you can't forget your past..." Bob Marley
RE: stress in pipe
RE: stress in pipe
You are not really answering his question. There is no difference between axial stress and longitudinal stress for a pipe - end of story.
RE: stress in pipe
Stress in the Axial Direction can also be caused by internal pressure and is nominally equal to the circumferencial stress, S = P*D/2/t, * Poisson_Ratio. P = pressure, D = diameter, t = wall thickness. Poisson_Ratio for steel pipe is usually taken as 0.3
If the pipe is unrestrained, the pipe will shorten without generating stress. If the pipe is held rigidly fixed at both ends, S will result as an axial tension stress.
If the pipe has closed ends, another axial stress can be generated from internal pressure, as the pressure will act on each closed end surface to generate an end force F = pi*D^2/4 * P
If the pipe is not axially restrained, the pipe will elongate with the resulting axial stresss = F/A in tension. If the pipe is held rigidly fixed at both ends by an anchor, or is well embedded in soil, the anchor or soil will take that load and an opposite compressive axial stress, F/A, will be introduced into the pipe.
If there are changes in temperature, thermal axial stress can be generated. If the temperature is increased, a compressive axial stress can be introduced into the pipe, or if temperature is decreased, a tension stress can be introduced. Thermal stresses are only generated if the pipe is held fixed at both ends, otherwise the pipe will expand or contract, respectively, without generating any additional stress.
Bending can introduce another axial stress Sb = M * c/I , tension on one side and compression on the other. M is bending moment, c is the pipe radius, I is the moment of intertia.
Total Axial stresses is the algebraic summation of all of the above.
RE: stress in pipe
The post given by DSB123 is correct there is no difference between axial and longitudinal stress its the same stress just a different name.
Do you mean what the difference between axial stress and hoop stress?
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
RE: stress in pipe
http://www.engineersedge.com/material_science/hoop...
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
RE: stress in pipe
RE: stress in pipe
RE: stress in pipe