# Questions tagged [bending]

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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 ...
• 31
119 views

### 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 ...
42 views

### 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 ...
• 33
1 vote
133 views

### How many support beams/rods needed for a firewood storage cabinet

I am building a firewood storage cabinet which should support around 100-150 kg of firewood. The cabinet is made out of wooden boards (...
• 111
1 vote
153 views

### Simple cantilever beam deflection - what is the simplest way to add a damper?

I am looking at a simple cantilever beam deflection: I understand the general expression for deflection/force would be: $$y_s = \frac{Fx_s^3}{3EI}$$ $$F_p = \frac{3y_sEI}{x_s^3}$$ If you were going ...
• 161
1 vote
2k views

### Multiple varying cross section beam with uniform loads

I have the following cantilever beam problem where I need to find the deflection of the tip at P. I tried to compute the deflection of the beam using Castignliano' s theorem as described in this ...
8 views

### Multiple varying cross section beam with distributed load - FBD Method?

Based on the 2 different threads read below : Multiple Varying cross section beam deflection + Multiple varying cross section beam with uniform loads I'm trying to set up a calculation sheet (Excel is ...
38 views

### Are there structural (or code) reasons for choosing longer or shorter beam spans (besides bending moments, and ignoring cosmetics)?

When selecting the length of beams for a bridge, the better approach is to choose multiple full-length beams. Unless there is a compelling reason, one would not choose multiple shorter spans. An ...
• 411
42 views

### Is bending stress over round thin-walled tube cross section linear?

It is thin walled because roughly d=200mm and t=6mm of a carbon fiber wrapped tube. The question is, if the bending stress $\sigma$ over the cross-section (in y-direction) is linear or not. It is ...
• 103
307 views

### Calculating Pressure Loss (K Value) of Pipe Bends at varying Angles

I am analyzing the total pressure loss of a run of pipe that has several pipe bends at varying angles (30, 60, 45, 90, etc. degrees). Reading through CRANE: Flow of Fluids Through Valves, Fittings, ...
• 1
17 views

### Spring making machines

There's lots of videos of high-speed spring making machines floating around e.g. YouTube, typically taking wire stock of up to a millimeter or so in diameter and producing items which are clearly ...
310 views

### Second moment of area (moment of inertia) for annulus segment

I am a Mechanical Engineering student and I'm working on some calculations for an assignment at a company. As a part of this assignment I need to calculate the moment of inertia (Ixx) of a segment of ...
• 1
89 views

### Traction boundary condition : Cantilever beam

Since I don't have that much experience with solid mechanics and stress theory, I am a little confused about my understanding. My problem is a basic solid mechanics problem of cantilever beam bending. ...
40 views

### Truss beam like structure strength per height

The second beam is 2x the height of the first one. Is 1 stronger then 2 to bending force (arrow shows direction, supported on the sides)? If it does, I'm trying to figure out why, because they both ...
• 115
99 views

### Bending moment capacity of T-cross-section (reinforced concrete)

I have a question regarding a simplification/derivation of the (ULS) bending moment capacity of a given T-cross-section, with compression-zone on the flanged side. The problem is that the rebar-strain ...
• 13
276 views

### What is the equivalent rotational/angular stiffness of a beam

I'm trying to model a larger system and working through a conceptual issue. I'm familiar with the concept of expressing the stiffness of a beam as an equivalent spring stiffness like in the image ...
20 views

### Is the a similar method of calculating moment in inelastic bending like in the case of torque for inelastic torsion?

When calculating for Torque in torsion or for Moment in the case of bending, the concept is usually first introduced with the simplification of the assumption that the stresses and strains are in the ...
69 views

### Bending stress and permissible bending stress

I have a task to choose a material and gear module for a double step up gearbox with equal ratios The first pinion has a max bending stress of 296 MPa and the gear has 239 MPa. The permissible being ...
• 3
269 views

### Calculating how many bolts are needed to hold parts

Suppose we have a stack of thin metal sheets, layered on top of each other. Let's say 20 sheets, 0.2mm thick, and each sheet is 70mm by 70mm. Let's also say that the sheets are not totally flat, so ...
• 121
85 views

### What process is involved in freeform 3D tube bending?

I have seen 3D freeform tube bending in videos such as this, this, and this. I would like to ask what process is involved in such machines. I can see a swivel mechanism used for bending. What is it ...
• 101
84 views

### How to reduce a welded iron pipe without bending it?

I would like to reduce the diameter of an iron (welded) pipe without bending to the side, where the weld is. With the usual procedure, the result is as follows: I am using the usual pipe reducing ...
91 views

### Composite Beam Theory - Calculating torsion and beam deflection of a composite beam made up of a pipe inside a pipe

I am trying to calculate two things. First the beam deflection of my model after bending and second angle of twist after applying torque. My model is composed of two tubes (cylindrical hollow beams). ...
Suppose you have a parallelepiped box of dimensions $a\times b\times L$ with $L\gg (a+b)$, filled with simple distilled water exerting a uniform and constant inner pressure $p$ as reported in figure. ...