Questions tagged [materials]

Use for questions about designing, manufacturing or synthesizing engineered materials or about the properties of specific materials. Questions concerning common construction materials, such as wood, steel or masonry do not need to use this tag; use the more specific tag instead.

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35 views

Stress strain curve stress and resilience

When calculating 0.2% offset from stress strain curve please, do I take 0.2% of the original length and then, divide this by original length to get strain and plot this please? And for resilience, is ...
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1answer
31 views

How to find yield strength and Young Modulus from S-S curve

I have a S-S curve and am not sure how to find yield strength from it as when I did 0.2% strain (0.002 * strain at fracture) I get a small number that plots close to (0,0)? For young modulus, I am not ...
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1answer
44 views

Building lightweight 1 km high fence [closed]

I would like to build a fence that is 5 km2 and height of 1 km. This wouldn't be feasible as the material needed and cost implications plus environmental factors. Therefore I thought of finding the ...
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0answers
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Manufacturing with glass panels [closed]

I would like to design a 3.2-inch LCD display onto a product. The best aesthetic I have seen is using a flush glass screen front face. My product does not use touch screen. How would I go about ...
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Filler Material

If I was to add a filler to a metallic substance, is it possible for the Young's modulus to decrease as filler content increases? Also, when a filler is added, how do the atoms change for improving ...
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4answers
53 views

Is it somehow possible to “lock” moving boxes without damaging them?

I have a standard moving box like this: Of course, since I'm asking about it, they don't have a top-down photo. These are other photos, if they help you understand how it's constructed better: ...
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2answers
41 views

Mounting a digital indicator on a plate

I have a flat aluminium plate and I need to mount a digital indicator[1] on it. The digital indicator doesn't seem to have any mounting holes itself so I think I need to use a clamp to hold it. I don'...
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1answer
1k views

Is cast iron better that Copper or Aluminum for cooking steaks?

Folk wisdom states that Cast Iron pan is the best for searing steak because of its high heat retention relative to the aluminum/copper counterpart. However, this doesn't make sense in practice... ...
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1answer
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Why is the Stress vs strain diagram preferable to the Load vs displacement diagram?

I’m really unsure what is the difference between stress vs. strain and load vs displacement graphs and why stress-strain is better. I know that the units are different: stress is in MPa and the load ...
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23 views

Why is carbon boil even necessary?

Particularly in an Electric Arc Furnace I have seen carbon boil occuring . I understand the reaction is very vital but what is it's utility? A detailed answer to this is most welcome. The internet ...
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2answers
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How can moving boxes not require any tape and still hold 50 kg of content without the bottom breaking when lifting them?

The other day, I bought a bunch of normal-price moving boxes. They come as one big cardboard unit which you bend in various ways. When assembled, they appear to be extremely strong and yet they are ...
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1answer
35 views

What does time temperature specifically give us? [closed]

What is a Time Temperature curve basically? I have come across this a couple of times while dealing with heat treatment in my industry. A detailed reply to this is most welcome.
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1answer
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Why is manganese steel non magnetic in as cast condition? [closed]

Is it because of some ferrite stabilizer or something?A detailed explanation to this is most welcome.
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3answers
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Shelf Reinforcements

Hi I know this is a little bit of a strange one, but I’ve got a relatively cheap shelving rack that I bought to make good use of garage space. I have included a pic, It’s footprint is 1220mm x 610mm ...
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What impact does reduction internal stress cause?

I have noted that recovery primarily reduces the internal stresses of the material.What is particularly confusing is why would that work out.A slightly detailed answer to this is most recommended.Also ...
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2answers
66 views

Pressure vessel wall dimensions

I am trying to design a small cooling setup which has two parts: the compressed air vessel and the turbines. My understanding is that the compressed air, upon being released, passes through the ...
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3k views

Why doesn't epoxy stick to silicone?

Why doesn't epoxy stick to silicone? Is there a type of epoxy that does?
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1answer
35 views

Economical difference with high-pressure vessel design pressures for fixed volume

Suppose space is not an issue and I need a fixed volume of compressed air (for storage), say 1m³. Is it more economical to manufacture a thick-walled vessel but with a smaller volume or a thin-walled ...
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0answers
16 views

Alternative materials for reflectors in solar concentrating systems

Other than the usual silvered mirrors, that are expensive to form into parabolas, what can be used as an effective reflector in parabolic troughs/dishes. I saw a few people tried using Mylar and Al-...
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1answer
33 views

Why does decrease in dislocation density result in higher ductility?

Why does a decrease in dislocation density result in decrease in yield strength and increase in ductility?A slightly detailed explanation is what I am looking forward to.
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1answer
19 views

Relevancy of (neutron energy loss and atomic weight) and the material selection of fast and thermal nuclear reactor

From this https://www.nuclear-power.net/glossary/neutron-moderatoraverage-logarithmic-energy-decrement/, I have found that the relationship between atomic weight and neutron energy loss can give the ...
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1answer
74 views

What is meant by soaking time in heat treatment?

After heating at 950°C and holding the temperature for 3 hours there is a soaking time that is provided for 12 hours. What is the soaking time being referred to here? A detailed reply to this will be ...
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0answers
23 views

Adiabatic compression maximum temperature achievable?

The TV($\gamma$-1) = constant formula appears to be unbounded, which begs the question how high can we go? Let's say you have a theoretical fire piston, and want to increase the adiabatic temperature ...
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0answers
18 views

A question on how heat treatment is done in bogies

During heat treatment of metals I find that Normalizing is done in railway bogies and tempering is done following normalizing only for the CP top and bottom. Following the tempering process quenching ...
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1answer
31 views

Mirror specification used in Solar Fresnel Collector systems

Im designing a Linear Fresnel collector system, and wanted to know what type of mirrors would be suitable for use as the reflectors. Thickness, type, coating etc. I couldnt find a manufacturer of ''...
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1answer
177 views

How do the constraints imposed on a material increase the stiffness?

As the title of this post says, how do the contraints increase the stiffness. For example, I was doing an exercise where I had to calculate the deflection on a rubber block with and without deflection ...
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1answer
19 views

Injection moulding

What are some examples of real polymer products that can be be produced by injection moulding ? I thought plastic bottles may be one but I think that is done mainly using injection blow moulding
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Which will be stronger for securing a cantilever umbrella in a deck

I am securing a cantilever umbrella baseplate to a deck. The decking timber will be reinforced with a pine nog between the deck joists. The options that I have are to use 10mm stainless steel coach ...
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2answers
27 views

What is the effect of Aluminium nitriding in steel?

"The most significant effect of AlN in steel is on grain size control, which directly influences hardenability, hot ductility, texture development, and mechanical properties."I have read ...
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0answers
29 views

What are the limits of small 3D printed gears?

How much tangential force should I expect a 10~20mm pitch diameter/1.5mm gear module 3D printed rack and pinion system to support without breaking nor sliding?
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2answers
848 views

What is a “mill-hardened” material?

I've read the yield strength of a material can be improved either by age hardening or mill hardening treatment. Age hardening is primarily a function of time and temperature with some environmental ...
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2answers
65 views

Best support for a granite table top?: Flat bar 316L Stainless Steel or equal box section or unequal box section

Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the legs having an internal angle of 80 degrees, made from 100 x 100 x 4mm 316L ...
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1answer
32 views

Polymer based disc brakes

I know that you can have metallic and ceramic composite brakes. My question is can you have disc brakes for a car that consists of polymetric materials or would this be impossible due to its low melt ...
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1answer
27 views

Production methods for AC mains power plug pins?

What are the production processes and steps involved in producing a mains powered device that plugs into a standard mains socket (like a smart plug for example). Mains plug pins are usually made of ...
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1answer
46 views

Why carbon ceramic brakes

What key physical, chemical and mechanical properties of carbon ceramic brakes make it better compared to other brakes for example metallic brakes made of cast iron ? I know that they are much more ...
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1answer
29 views

Use of Cast Acrylic sheets as glazing in a Flat Plate Collector for domestic water heating

I am designing a FPC for heating water. I was wondering about the feasibility of replacing the usual Low-iron tempered glass with Cast Acrylic sheets [owing to non-availability of the former where Im ...
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1answer
54 views

Salt grinder and corrosion

I am looking for a kitchen salt grinder. I know salt is an aggressive compound and it needs a little bit of attention when we design products. Since most of grinders have plastic-made or stainless ...
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0answers
12 views

why did my ceramic matrix composite turn out brittle as snow?

I have attempted making a ceramic matrix composite (cmc) by wetting glass fiber cloth with waterglass and baking it at 200°C. The resulting material disintegrated on touch. Unwetted fibers did not ...
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1answer
10 views

How to calculate specimen strain in split hopkinson pressure bar?

I want to plot the stress-strain chart for a specimen after a test. In the output file of excel, I have "Strain of transmitted bar" and "Strain of the incident bar" I also have ...
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1answer
29 views

Question about a particular statement on plastic deformation of single crystals

"...the wider the dislocation, the lower is the elastic energy of the crystal because the atomic spacing in the slip direction is closer to its equilibrium spacing." What has elastic energy ...
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0answers
62 views

How long can a chair sit before wearing out?

I'm mainly interested in aluminum or steel chairs here, as they're what I have lying around, but other materials could also be interesting to hear about if anyone has the data. As I understand it, the ...
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0answers
8 views

What is relationship between dislocation width and interfacial and elastic energy?

Let us say I have a defined dislocation width,now how would the interfacial energy and elastic energy vary when the dislocation width is more or less.I feel having a wider dislocation would mean bonds ...
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0answers
23 views

How is calcium and aluminium wire feeding different from each other?

How is Aluminum wire feeding different from that of Calcium wire feeding as far as the purpose is concerned also what I do not understand is what has wire feeding to do with the purpose and how are ...
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0answers
24 views

Doubt in triaxial stress state in a notched specimen

In the book titled "Mechanical Metallurgy" written by G.E.Dieter I am having problems to understand why a notch in a material would mean a triaxial state of stress.I do well understand that ...
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2answers
507 views

Why does corrosion take place at certain stressed regions?

Why does certain parts of metal show more corrosion at the place where there is high dislocation density in comparison to the place where the dislocation density is less? I do sincerely feel that this ...
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0answers
18 views

What material can wick up fluids while not allowing micro-organisms to pass?

I'm looking for a material that can wick up a solution containing nutrients and sugars. The dirty side of the wick should touch a medium to draw up the solution, on the clean side of the wick ...
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1answer
27 views

What Rubber is Best for Laser Cut McKibbens PAMs?

I'm a layman engineer who's decided to take another step forward in my research and work with McKibbens Pneumatic Artificial Muscles. I’m new to creating custom rubber components and laser cutting, so ...
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2answers
44 views

Polypropylene material characterization

I'm trying to make an evaluation of the available 3D printing options of polypropylene and I'm having difficulties comprehending material characteristics that make PP PP-like. I realize this sounds a ...
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1answer
43 views

Is this alternate grounding practice practically implementable?

While grounding power sockets in modular prefabricated steel buildings (see Light Gauge Steel Frame Technology), can we just connect the ground wire to the steel frame of the building itself? as the ...
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1answer
43 views

How to cut a thick glass block at home?

Due to pandemic, there are a lot of machine shops closed and delays in getting something custom made. I was wondering how to cut a triangular glass prism (~5cm hypotenuse) in the middle so I have two ...

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