# Questions tagged [deformation]

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24 questions with no upvoted or accepted answers
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### How to calculate the adhesion I need to keep a 3D printed bending part straight?

3D printed parts cool down during printing, resulting in thermal contraction which causes a bending moment and separation from the printing bed. The issue is solved by increasing adhesion to the ...
• 179
148 views

### Calculating the bending moment ($M$) of a beam as it relates to stress ($σ$) and strain ($ε$)?

I am trying to learn how to work out the bending moment for progressively complex systems to model a beam. I am assuming only one axis of motion (transverse = $y$). For the basic equation of material ...
• 161
84 views

### Are Green strain calculations apt for volumetric strains?

I am trying to calculate large volumetric strains but I am somewhat confused whether Green strain is the right thing to be using or whether I should use good old-fashioned engineering strain. The ...
11 views

### What degree of open span/narrow support can rigid PIR thermal insulating foam sustain under the short term load of setting concrete?

I've found data related to the deformation and shear performance of typical PIR (polyisocyanurate) foams such as Celotex/Kingspan, but I'm not sure how to use these figures in my own situation. I am ...
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620 views

### Impact force with unknown deformations or time duration?

I expected to find more documentation on analytical solutions to determine the contact force between bodies, where deformations ($\delta = \delta_{1} + \delta_{2}$) and impact time ($t = t_{f} - t_{i}$...
• 743
67 views

Due to the fact that pipe flanges rely on bolts, and bolts rely on friction, it seems obvious to me that in deflecting to meet the load, the nut will immeasurably turn. So my question is - how much? ...
• 5,333
1 vote
103 views

### How can I describe cold work and atomic structure?

A copper wire (42 cm x 0.25 cm diameter) twisted to failure did not change its dimensions significantly. How can I visualize or quantify the cold work done (tensile at the exterior, compressive in the ...
• 111
1 vote
106 views

### Calculate Rolling Resistance Experimentally

I am trying to calculate the exact rolling resistance ($F_{rr}$) of my car. The approach I am going with is a coastdown test at a low speed so no drag slows down the car. From there I am going to ...
• 11
1 vote
32 views

### How to calculate a global strain from a field disitribution

For an arbitrary articulated structure subject to non-affine (non homogeneous) deformations, the components of the strain tensor are defined locally. Is there a way to calculate a numerical strain ...
• 11
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### Confusion in deriving von Karman equation for strip rolling

In the derivation for von Karman equation for metal strip rolling, an infinitesimal element is chosen as shown in the picture above. The equilibrium equation for the element is as follows: Upon ...
8 views

### Does the magnitude or range of interaction of a force affect which layer dominates the mechanical response of a multilayered structure?

Suppose I have a two-layered material, with a stiff and thin outer layer (high E) and a soft (low E) and thick inner layer. Intuitively, it feels like the effect of short-ranged forces (e.g., van der ...
93 views

### How to go from a metal sheet to a metal box using (set of) dies only?

As a hobbyist, how to go from a metal sheet to a metal box (1 hollow side) by using (set of) dies only? All videos I watched involved : bending 1 side at 90° then A) cut twice and discard a square ...
• 101
22 views

### Fracturing and Necking

I am trying to model the deformation of an object after it has surpassed its UTS, before its ultimate failure, what formulas/methods are used to calculate this? My assumption is they have to do with ...
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### Deformation in nano timescales for stress > UTS

I am investigating the deformation of high-strength carbon steel past its UTS, subject to extreme pressures of order 1e+19 Pa, but applied in small timescales (100-500 ns). For a material, such as ...
• 21
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### Deformation Under High Pressure

If a FEA model suggests that a material deforms in a certain way for a max pressure of 1e+11, 1e+13, 1e+15, can it be suggested that the same "direction" of deformation would be true? I have ...
• 21
45 views

### Ansys Mechanical Section Plane Error

I'm attempting to make a deformation analysis for a specific scenario in Ansys Mechanical. Everything seems to be fine, but when I try to use a section plane, the deformed region appears to be 'hollow,...
18 views

### Calulating the compression deformation using strain data measured by strain gauge _ material engineering

I'm studying material engineering and conducting some experiment. The experiment was measuring the strain of long steel bar. The bar is compressed from left side and deformed shortened. Using strain ...
• 1
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### Beyond the codes maximum deflection in primary Aluminum beam

we had a alum pool enclosure built that has a primary beam carrying the roof trusses across it's length. the primary beam is a 4x8 bx beam spanning 43'between supports. the beam has started to show ...
175 views

### How to calculate the spring force of a rolled piece of steel?

If you have a steel sheet and then curled it to the point of being a semi-circle with a 30 degree (pi/6) gap from completion (...
89 views

### How they derive The Green strain tensor?

in this paper they give the deformation tensor and the green lagrange tensor without explanation i have some difficulties with tensor calculus ,Especially dyadic product can some one explain it in ...
33 views

### Model for dynamic plate deformation

I would like to gather ideas to model the dynamic behaviour of a plate with variable thickness. The assumption are: Small deformations. The plate is all made of the same material with variable ...
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### Quantifying the amount of structural/hysteretic vibrational damping that occurs in proportion to deformation? (ie. Based on how "bent" something is?)

Three different conceptual types of vibrational damping forces are described here: Viscous: $f(t) = -c \cdot v$ Coulomb: $f(t) = -c \cdot \text{sgn}(v)$ Structural: \$f(t) = -c \cdot |x| \cdot \text{...
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