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Mechanical Engineering
Understanding horizontal shear in beam with vertical load
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[QUOTE="Lnewqban, post: 6623086, member: 673625"] Keep in mind that this shear flow concept was developed for dealing with thin wall cross-sections. I may be wrong, but this is the way in which I see it: If you can visualize the flanges of the beam as thin plates, you can see that: 1) The difference of the shear forces in the y-direction are negligible. 2) Is the area of both plates that are connecting to the web the ones "feeling" the pulling and pushing of the axial forces induced by the moments. 3) The shear force next to the edges of a thin plate is close to zero in increase toward the central area of the plate, as the following link shows. Please, see: [URL]https://en.wikipedia.org/wiki/Bending_of_plates[/URL] Therefore, the arrows represent how the flow begins and the free edges of the top flange (just like it starts at the top edge of a rectangular cross-section loaded from the top), increases in magnitude until reaching a max at the neutral line of the beam, to decrease again until reaching the free edges of the bottom flange. Note that the shear flow for a beam loaded by negative moment would be represented in the opposite direction. Please, see: [URL]https://mathalino.com/reviewer/mechanics-and-strength-of-materials/relation-between-load-shear-and-moment[/URL] [URL]https://www.ae.msstate.edu/tupas/SA2/chA14.7_text.html[/URL][ATTACH=full]300102[/ATTACH] [/QUOTE]
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Understanding horizontal shear in beam with vertical load
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