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Engineering Stack Exchange

Questions tagged [bending]

47 questions
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Why do we always need to calculate the 'Moment of Inertia' about neutral axis for bending?

I was having a look at the bending stress derivation in few of the books. The derivation indicates how each of the element in the bending stress equation is derived into that equation. However, for the moment of inertia (i.e. I), it is not indicated…
Rameez Ul Haq
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What are the units used in beam bending equations? Do they matter?

I was just wondering whether or not the standard beam bending equations worked for all units. E.g. imperial and metric etc. From what I'm guessing it shouldn't really, since once we plug everything in the units should cancel out properly.
TwoWaySpeedOfLight
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How do I EXACTLY calculate the k-factor for metal bending?

Introduction I've recently started to work with metals and the process of bending them. There is a lot more math involved than I initially thought. All the break press operators just have a standardized list of k-factors that they either use or…
Kapfy
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Failure in Hollow, Thin Beam due to Collapse of Cross Section

I'm having trouble figuring out how to predict the failure of a hollow channel due to bending. If I'm correct, for a beam with a static second moment of area, $I$, the following equation could be used to find the bending moment needed to cause…
Nick Fingerle
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Is bending moment along a beam independent of the cross sectional area of the beam?

We know this that if the a cantilever beam (of any cross section) is fixed at one end and a transverse force is applied on the other, then it will bend. However, we just casually assume that the moment only depends on the type of transverse loading…
Rameez Ul Haq
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Metal sheet forming - material properties when switching material

What does one have to look out in material properties when changing material grade in cold sheet forming operation (example: from DC04 to DC03 or to DC01). Operation is mostly made of 90°bends and punching (16 mm parts).
branexius
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Finding the Shear Center for a Beam with 1 Axis of Symmetry

I am trying to solve this problem of finding the shear center for the given beam and I have found that e = 35.94 mm, however the solution that was shared with me, had the answer of 39.17 mm. My method is to integrate the segment for each force…
DemonLordKing
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What is the relation between the angle of a bend along one axis and the length of a face perpendicular to that bend

Sorry if the title doesn't make sense, I just cant think of how to word it so I'm going to be using images to help. Basically I have a piece of sheet metal that I have bent along one edge to give me a right angle, I then bend it down the middle,…
M.Powell
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Maximum Shear force in diagram

So here I have a cantilever beam and I have the shear force diagram. When we are talking about the maximum shear force diagram. Should I take 40kN? Or I need to absolute the value and take 60kN. I am new to mechanical engineering and I am so confuse…
Antonymous
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Limits of Euler-Bernoulli Beam Theory for Wide Plate in Flexure?

I'm looking for established limits or rules of thumb for the validity/accuracy of Euler-Bernoulli beam equations for particularly wide "beams". For example, a simply supported rectangular plate where the breadth(b) is much larger than the height (h)…
willpower2727
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Does Bending Stress Affect Natural Frequency?

I have been researching about the factors that affect natural frequencies, particularly about the effects of stresses. Most of what I have found only discusses compressive and tensile stresses though, that they decrease and increase the natural…
Xyzar
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Bending analysis of beams with varying cross section

All problems I solved in MoM class regarding beam bending involved a beam with continuous cross section. But is the process the same for a beam with varying cross section? For 'same process' I mean applying the basic MoM equations learned and…
VXLR.
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How to find the location on the 2-support beam where the deflection will be biggest?

Consider the uniform indeterminate beam as shown above. This beam is to be subjected to a single, 80N point load (acting down ) somewhere along its length. What is the procedure (i.e steps and logic) to calculate the location where application of…
Noideas
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should the hachures in moment and shear diagram be vertical?

when we plot the shear or moment diagram we add hachures to the area created with these diagrams , in most cases we see vertical hachures, is it represent the internal forces? or its just used to highlight the area ? and can we use inclined…
Samir Benabdelaziz
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Maximum shear in a beam

Engineering books and lectures typically make two things clear: Maximum bending stresses (normal) develop at the beam surfaces, that is, at the greatest distance from the neutral axis. Shear stresses on the other hand have their maximum at the…
Erik
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