The absolute roughness value can make a big difference if you have, e.g., a long, straight, horizontal pipeline discharging water into atmospheric air. Imagine, e.g., long sections of pipe, and joint designs that connect the pipe perfectly flush, with no joint interior protrusion nor gap. After...
(1) Maybe I should expand my question to include polyethylene (PE) pipe, and not just polyvinyl chloride (PVC) pipe (?). Which of the two is more common for water pipe, in the diameter range I mentioned above? And is the polyethylene pipe usually PETE, HDPE, or LDPE? (2) Is there a difference in...
Yes, I should have stated, I want the typical absolute roughness, in mm, of typical, new, clean, rigid PVC pipe having an ID of, say, 15 to 75 mm. Thanks.
Correction: My second sentence should read, "If you apply your test force to it, the linkage rods rotate upward (and the suspension upper plate stays level), which is a dynamic problem."
davidmandis: Your structure, as currently drawn, is a mechanism and is therefore unstable. If you apply your test force to it, the linkage rods rotate upward, and the suspension upper plate rotates downward, which is a dynamic problem. In order for this structure to be static, you must fix at...
BlastResistant: The so-called nominal flexural strength, Mn, is Fy*Z as stated in your second and third paragraphs, not Fy*S as stated in your first paragraph. And this Mn value also applies to bending about the major axis (if the member has adequate lateral bracing), not just bending about the...
Cecile9: There are two Nxy vectors at each corner fastener, intersecting at 90 degrees. One Nxy vector is parallel to Nx, and the other Nxy vector is parallel to Ny. The parallel vectors are directly additive.
licensetochill: If the U-bolt ends are simply supported, the maximum bending moment on the U-bolt occurs on the unthreaded shank at the midpoint of the leeward leg and is M = 0.62*r*F, where r = U-bolt mean radius, and F = lateral wind force on the pipe. If the U-bolt ends are fixed (clamped)...
PLCKing: The aspect (length-to-thickness) ratio of your elements is too large, which is an inherent problem with trying to use solid elements to mesh thin plates. Shell elements, on the other hand, are ideally suited for meshing thin plates.
You can perhaps perform a reality check on your fea...
prex: If you run two separate regions in an analysis program, as described in blakrapter's second post, the program has no knowledge of the composite cross section centroid location. Your formula requires this composite centroid location, whereas mine doesn't. My y1 is the distance between the...
blakrapter: A2 is the cross-sectional area of the second region described in your second post. The Ix derivation is, summation of moments of inertia of the two shapes/regions (outer and inner) described in your second post (about an arbitrarily-located x axis), minus summation(Ai)*d^2, where d...
blakrapter: I think your approach sounds good. If I understand correctly the way you are doing it, then working this out using parallel axis theorem in reverse, and simplifying, gives
Ix = Ix1 - Ix2 - {[(A1*y1 - A2*y2)^2]/(A1-A2)},
where Ix = centroidal moment of inertia of composite cross...
franc11: For load case 2, it's possible, in rare instances, that the right-hand bolt could be in "compression" (meaning zero bolt applied load) if the upper plate is very flexible compared to the lower plate, because then the upper plate might bend at, e.g., the left-hand bolt.
But typically...
PCS74: I haven't checked Roark, but I think you can estimate the maximum line load per unit length, w, required to deform the ring by setting the bending stress at +/-77 deg (and +/-103 deg), divided by plastic shape factor, equal to tensile yield strength, and solving for load w. This works...
Philrock: ISO 898-2 doesn't list nut yield strength. A nut of property class n can support greater than or equal to the bolt proof strength load of a property class n.j bolt without encountering permanent deformation of the fasteners (meaning the nut is removable by the fingers after the load...
carpenters1son: Answers to your three questions. (1) Yes, you seem to have a good understanding of what I wrote. (2) I agree, and I agreed with where you said in your original post "rotations not fixed." (3) Yes, that sounds like a good approach.
carpenters1son: Assuming these tanks have an integrally-connected floor, then rather than constraining all nodes around the exterior perimeter in two horizontal directions, instead constrain only the midpoint of one exterior wall in two horizontal directions, and constrain the midpoint of the...
tnteng: I agree with your findings; I got the same thing. Extreme fiber stress on the upper leg of the C increases only slightly due to the increased tensile stress as the cable angle is decreased. However, the tensile stress on the lug eye, on the other hand, increases directly in proportion...
