All Questions
Tagged with materials solid-mechanics
19
questions
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DLC wear resistance
I read that a thickness of one micrometer of DLC coating (which, if I understood correctly, shows similar properties to diamond), increases the lifespan of an item plated with it from a week to more ...
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Plane strain delamination on bilayer material (conversion from material stress state to residual force and moment)
I have been reading the book The Mechanics and Reliability of Films, Multilayers and Coatings (https://doi.org/10.1017/9781316443606) on chapter 4.2 and got stuck in chapter 4.2 and 4.3.
Suppose that ...
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1
answer
52
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Potential Problems of Excessively Hard Shaft
Will there be any issues if we make the shaft too hard?
Hardness being a surface property may prevent surface scratches and wear, could it lead to any problems in general?
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Conversion of elastic moduli for plane stress case
For isotropic material an elastic modulus, like Young's modulus and in combination with a Poisson ratio can be used to convert to any other elastic modulus, like for example the bulk modulus. Tables ...
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Stress concentration
Let's say we are using an aluminium with a yield and ultimate stress for an element like this:
In this case we will get some stress concentration around the fillet due to the change of area, however, ...
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2
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145
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What are the practical solutions to manufacturing this mechanical piece?
My Custom Piece (Measures are in mm)
I'm designing a custom mechanism that needs this piece to be able to function, but when i started thinking about how to manufacture it, I started getting confused ...
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138
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What is the difference between an alloy and a metamaterial?
Metamaterials are carefully structured materials — often consisting of periodically arranged building blocks — that exhibit properties and functionalities that differ from and surpass those of their ...
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2
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4
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What is the significance of brittle materials and why do we use them?
What is the significance of brittle materials and why do we use them?
As you can see in the stress-strain curve, brittle materials have extremely low plasticity, in which cracks can initiate without ...
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How do I properly scale down a force for scale-down model testing?
I am designing structural frame for a shipping container that would have 8000 lbs of weight stacked on top of it. Of course, i don't access to real size container. I have built a model whose scale is ...
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2
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3
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276
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Do all structures deform if put a load on them?
Suppose I have a concrete wall in front of me and I push on it, now it seems that I do work and the energy has magically disappeared.
I am trying to figure out how this works, the explanation I ...
user28616
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2
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173
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Modeling composite material fibers orientation in a FEA
I am looking for guidance for analyzing composite materials that are reinforced by fibers of some sort. A good mental model would be bars of steel in concrete. The concrete will have its own physics ...
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2
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51
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Why do all quantities used in the formulation of a physical law must be coordinate-invariant?
So I have just started reading the book "Introduction to Continuum Mechanics_third edition" written by W. Michael Lai, David Rubin, and Erhard Krempl.
At the end of the book's introduction, ...
user27920
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1
answer
50
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"Springiness" of rolled copper sheet
When a copper sheet is rolled into cylinder, it tends to unroll itself. Is there any name for this?
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2
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1
answer
129
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Compressional Strain Definition
Strain in the x and y directions are defined by the following equations:
$ε_x=\frac{du}{dx}+\frac{1}{2}[(\frac{du}{dx})^2 + (\frac{du}{dy})^2]$
$ε_y=\frac{dv}{dx}+\frac{1}{2}[(\frac{dv}{dx})^2 + (\...
- 33
1
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1
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Stress strain curve [duplicate]
According to uniaxial stress strain curve, specimen fails at a certain stress value since necking begins.
My question is that, same stress value appears before necking especially around yield point ...
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