Questions tagged [metals]

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The behavior of the stress-strain curve of metal, containing a void

Let's assume that in a metal sample without any dislocation, there is a void. Then we conduct a uniaxial tensile test. (1) How does the stress-strain curve change, when the size of the void increases? ...
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0answers
21 views

Should I use brass compression fitting on brass tube?

I would like to use brass compression fitting on brass tube, I am confused because I have seen all the fittings that are used for copper and steel tube only. Is there and disadvantages?
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1answer
43 views

Metallic flow behavior under eccentric loading conditions

So, I did a quick search around and didn't seem to find anything regarding this, so I thought perhaps I should just ask a question. Metals are malleable and will generally flow/deform if you roll it ...
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0answers
26 views

Steel Worm/Steel Wheel vs Steel Worm/Bronze Wheel

I have a question regarding worm drives, specifically double-enveloping types: Do steel worm/steel wheel combinations last longer than steel worm/bronze wheel or steel worm/brass wheel combinations? ...
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0answers
88 views

Calculating diameter of steel rod required to not bend over a given length

I want to use steel (or other material) rods to support weight over a 900mm cavity. The weight that needs to be supported is technically unknown, but I'd specify some rough guidelines as: 100KG (max) ...
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0answers
100 views

Can coating tungsten to stop oxidation?

A patent that I read that stated: " Coating tungsten with nickel then with aluminum, will stop oxidation in open air environments. And even pass the melting points of both the tungsten and nickel, ...
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0answers
11 views

Thermal expansion during the course of melting (in metals specifically)

The question is with regards to Thermal Expansion at the point of melting. My basic understanding is that a material will generally undergo linear thermal expansion until some phase change occurs (...
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0answers
11 views

Will expanding metal disrupt my motion sensor?

I am trying to install a door motion sensor in a environment that will get very hot for our work. So the door could heat up to temperature of 150-200°F. We built the frames and door to handle the ...
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1answer
34 views

Effect of annealing on the defects

What is the effect of annealing on the defects present in the sample? Does it remove defects in the sample? Is there any chance that due to annealing the point defects present in the sample combine to ...
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0answers
31 views

How to produce aluminium powder by E. J. Hall method

I have watched videos on YouTube producing Aluminum powder by mechanical methods. Like this one. It uses Aluminum foil and coffee grinder: There are similar videos which use the same basic method but ...
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2answers
410 views

What metal thickness and/or type is needed to support 100kg load?

I'm making a prototype that will have some load cells mounted approximately where the arrows are pointed in the image. The prototype will hold up to 100kg of load/force in the marked location thus I ...
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0answers
40 views

Find electronics in wilderness; or, “I dropped my cell phone in the woods!”

Imagine I was working in the woods and dropped my cell phone somewhere in a large area where it is now hidden beneath dense vegetation. By calling it I confirm that either it has powered off or its ...
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1answer
109 views

How Can I do punching of 0.22mm in stainless steel sheet (Sheet thickness 0.5mm)

Wanted to press punching of 0.22mm dia (Bottom) and on (top) 0.6mm dia Please suggest how can I make such die?
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3answers
2k views

What is the proper screwdriver for a M2 counter-sunk hex screw?

I have many M2 flush-mount, counter-sunk hex screws ordered from a variety of sources, including McMaster Carr, Ebay, etc. The Wiha 263 1.5x50 screwdriver I have does not drive any of these properly, ...
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2answers
166 views

What is the rated tensile strength of 2000 kcmil stranded copper conductor?

All the documentations I could find goes upto only 1000 kcmil. Please direct to a reference for larger cables. Is there a method to extrapolate from smaller cable sizes?
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1answer
75 views

Hansel-Spittel equation parameter determination

I am currently learning how to determine the Hansel-Spittel equation parameters. The equation has following form: $$\sigma= A \cdot e^{m_1\cdot T}\cdot(\epsilon^{m_2})\cdot \exp\left(\frac{m_4}{\...