Questions tagged [material-science]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
4 answers
32 views

Why do some tensile test samples fail before the expected final elongation

We tested several 1020 steel samples during my class' lab session last semester. during the test, one of the samples failed early, breaking at a strain of around 0.3 or 0.2, while the other samples ...
asker's user avatar
  • 89
0 votes
1 answer
29 views

What is the best cutoff wheel material to cut titanium?

I want to thin titanium rods about 1/2in thick quickly. I've heard silicon carbide and diamond tipped masonry wheels are good. Which is better, less prone to wear/replacement, fastest cutting time?
belza00's user avatar
0 votes
0 answers
21 views

What are the change in forces with a ribbon under tension is twisted?

Consider pallet strapping. It has width W. When the strap is flat, it has some maximum breaking strength B. Now, let's put one twist in it over X feet. Mentally we have a VERY skinny isoceles ...
Sherwood Botsford's user avatar
0 votes
1 answer
92 views

Effect of multiple alloying elements on steel's eutectoid properties

Mechanical engineering student here (the professor is not being helpful). When a single alloying element is added to a normal iron-carbon steel, the resulting changes in eutectoid temperature and ...
MaplePanda's user avatar
0 votes
1 answer
22 views

Need to know tolerance of certain rubbers to pH 11 Bases

I need to know whether neoprene and HNBR (Hydrogenated Nitrile Butadiene Rubber) seals can tolerate pH11 atmosphere. The seals would be in touch with a fertilizer which is pH11.
John Snow's user avatar
  • 137
0 votes
0 answers
13 views

Question About Dimensions and Figures Surrounding A Pressurised Nitrogen Canister

I need a nitrogen gas canister that will nitrogenate a beverage much like how SodaStream carbonates. Here are some approximate numbers: The beverage to nitrogenate is 600 - 1000 mL I want to be able ...
empleadozera's user avatar
0 votes
1 answer
50 views

What materials where used in this study or ones that would make the most sense please!

I understand that they used two different materials and combined them through fiber drawing process but I don’t truly understand which materials were used. Here is where it is mentioned in the article....
Ink's user avatar
  • 1
0 votes
1 answer
36 views

Material suited for fixing leakage in liquid nitrogen dewar

I need to fix a leak on the inside of a liquid nitrogen dewar which acts as the coolant tank for a spectroscopy CCD camera. Due to the design of the camera, I unfortunately can only access the inside ...
Mika R.'s user avatar
0 votes
1 answer
71 views

How is fuzzy velvet-like surface on plastic achieved?

This kind: It's a very thin layer of very short (<1mm) hairs, coating a hard plastic underneath. I encounter this sort of lining on some mid-tier electronics that pretend to be more classy than ...
SF.'s user avatar
  • 6,125
0 votes
0 answers
23 views

Can air be implemented in 1-Dimensional photonic crystals?

As far as I am aware, digging holes in nanostructures or using columns of materials in a medium of air is the main way by which 2D photonic crystals work. I thought it would also be common to ...
Dead Scissors's user avatar
0 votes
0 answers
13 views

How can I calculate the maximum center load on a horizontal cellular glass tile; supported along its edges, before it breaks?

Insulating cellular glass boards or tiles are designed to sit on a flat load-bearing surface. I want to consider the situation where the base is concave so the tile is only supported on its edges. I ...
CuriousGeorge's user avatar
0 votes
1 answer
76 views

Does elastic deformation becomes plastic deformation, given sufficient time?

I'm confronted some aspects of Material Science I'm unfamiliar with. In general, if a material is subjected to an elastic deformation for too long, does that become a plastic deformation? Does this ...
Diego Alves's user avatar
0 votes
0 answers
29 views

Why is there a lack of data and analysis of elastic range of PTFE (Teflon)?

I am looking for the proportionality limit and elastic limit of PTFE (Teflon). There are several papers which reported the mechanical behavior of PTFE in tensile test. However, almost all of those ...
austin_fluxpinner's user avatar
0 votes
1 answer
50 views

Which has more density: 100 °C steam or 100 °C dry air?

I am aware of the fact that steam is lighter than dry air. But I want to understand if it is merely because of the temperature difference.
Koushik Sarkar's user avatar
1 vote
0 answers
43 views

What is the "damage threshold" for concentrated sunlight upon a mirror?

I am trying to determine the maximum $Watts/cm^2$ of concentrated sunlight -not lasers or laser pulses- that polished mirrors of various kinds can handle, -Aluminum vs Silver, say. What equations are ...
GhostsonAcid's user avatar
0 votes
1 answer
30 views

Energy balance of "air-gen" direct water vapour to electricity generation

I've just read this article on a new - albeit very small scale ATM - way of generating electricity directly from water vapour: https://www.theguardian.com/science/2023/jul/02/it-was-an-accident-the-...
Damian Birchler's user avatar
0 votes
0 answers
26 views

Can rubber be used as the membrane in a diaphragm compressor with a 1:10 or higher compression ratio?

I've been investing time learning about diaphragm compressors and I can't understand how this particular type of compressor can have a 20:1 compression ratio, and what material could stretch that much ...
Boolean's user avatar
  • 131
0 votes
0 answers
24 views

How to compute the resistance of this metallic part (steel angle iron), for a joist fitted in an I-profile beam?

Let's say we have an oak joist (15 cm x 15 cm x 370 cm), which is "fitted" in the profile of an I-profile beam (height 140 mm, width 66 mm), and the surface where the joist is laid is too ...
Basj's user avatar
  • 101
0 votes
0 answers
8 views

how to create a Ti V simulation cell with virtual cell approximation for density functional theory calculations

I would like to understand the method of creating simulation cells using the virtual cell approximation for different compositions of TiV using vasp
maheshwari meesa's user avatar
0 votes
1 answer
15 views

Elastomer that is durable & oxidation resistant

I tend to bundle up my folders & small supplies with ordinary rubber bands (polyisoprene). I find that after a few months these rubber bands would deteriorate & need replacing. Faster even ...
Tempus Nomen's user avatar
2 votes
0 answers
28 views

What determines the rate of electron discharge machining (EDM) for different materials?

Wire EDM makes no contact with the work piece and disregards hardness. I am using EDM to cut different materials, and I notice a clear distinction between the rate each material gets cut. For example, ...
FlakR's user avatar
  • 131
0 votes
0 answers
23 views

How to determine the performance index M for the outer vessel of a vacuum bottle? Need help with objective and constraint selection (Ashby diagrams)

I'm reaching out for assistance and advice regarding a problem I'm encountering in my thermal bottle analysis. I have been attempting to determine the performance index M but facing significant ...
Valentin Prezti's user avatar
0 votes
0 answers
14 views

How to synthesize alloys or new materials on a small scale?

At the lab scale, alloys or intermetallic compounds are synthesized in an arc melting furnace or by induction melting. The quantity produced is about 5 to 10 grams at minimum. My question is, what if ...
Nilabja Kanti Sarkar's user avatar
3 votes
1 answer
205 views

How the choice of etchant can affect the severity of hydrogen embrittlement during pickling and passivation?

Following this question, I am trying to understand how/if the choice of acid we might use during the pickling and passivation of certain metals, can influence the severity of hydrogen embrittlement. ...
Foad's user avatar
  • 249
1 vote
0 answers
89 views

What material performs best in this situation?

Take a long, thin rod, say .25 mm in diameter and 200 mm in length. Filling these fixed dimensions, what kinds of materials could the rod be made of such that it minimizes how much the rod bends under ...
Joey Peluka's user avatar
1 vote
1 answer
37 views

Is there an electrical analogue to mechanical fatigue with respect to dielectric strength?

Suppose I have an elastomeric specimen from a material sample known to have dielectric strength of, say, 15 kV/mm, as informed by previous dielectric strength testing. If I were to repeatedly subject ...
Skyglare's user avatar
0 votes
2 answers
21 views

Will a thin overcoat of silicone sealant protect a non-waterproof adhesive underneath?

I'm trying to bond PMMA to Nylon-6 for a submerged application, and the only thing that I've found that will reliably bond these parts is a 2-part polyurethane. (No epoxies work, I think because of ...
user278411's user avatar
0 votes
0 answers
36 views

What Formula can be used to plot a relation between stress and strain?

Suppose a question starts by pointing that a cylindrical sample of a certain metal (in my case it is brass alloy) was put under a load. This piece has an initial diameter and length of 1.263cm and 5cm ...
Redox's user avatar
  • 1
0 votes
0 answers
52 views

Corrosion of Ice Auger Blades

I am wondering about corrosion of the steel blades on my ice fishing auger. The auger is used on fresh water lakes (ie no salt involved). I have traditionally brought the auger inside to melt the ice ...
Grouseman's user avatar
0 votes
0 answers
32 views

Material Selection for a Stator

What would be the best material properties or relevant performance indices of the material for a stator in a relatively low rpm application. Just the stator, not the wires surrounding it. The ...
Ed3D's user avatar
  • 1
0 votes
0 answers
52 views

Grain size and fatigue performance correlation for AMS 5662 Inconel 718

I am trying to do a literature review on the correlation between average grain size and fatigue performance of AMS 5662 (solution annealed condition) Inconel 718. The Special Materials Corporation ...
Foad's user avatar
  • 249
0 votes
2 answers
49 views

Maximise rigidity of acrylic rod/tube

I understand that for a given quantity of material a tube is stronger than a rod. I have a 1.4m clear acrylic rod with 16mm diameter however it is too flexible for its intended purpose (imagine ...
IntoTheBlue's user avatar
0 votes
1 answer
92 views

How to solder the stainless steel rods

How can we solder two stainless steel rods material- Stainless steel 304 or SS316 OD-6mm ID-1.6mm Depth-4mm Or there is any other better option to join these two parts?
Rushikesh Handore's user avatar
0 votes
1 answer
178 views

What's the difference between amount of phase and chemical composition of the phase

I don't understand the difference between chemical composition and the amount of phase, why does the chemical composition of the phase not add up to 100%. For example in the image below the chemical ...
Youssef Mahmoud's user avatar
0 votes
1 answer
37 views

Does the thickness of a foam block change it's compressibility?

As I understand it, foam blocks have a property called firmness, which is essentially, for a given % of height reduction, how much force does it take to achieve it. Firmness is measured using the ...
Stan Shunpike's user avatar
0 votes
1 answer
91 views

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 ...
user21's user avatar
  • 109
0 votes
1 answer
21 views

What is the effect of lateral friction on the specimen shape

During compression test lateral friction occurs on the lower and upper surfaces of the specimen how does this affect the final shape of it and how do we reduce this effect?
Youssef Mahmoud's user avatar
0 votes
0 answers
43 views

How do you plot a relation between hardness and strain

How do I plot the relation between hardness of a material and compressive strain knowing the stress-strain curve and indentation size in Brinell's hardness test
Youssef Mahmoud's user avatar
0 votes
1 answer
321 views

Why does the stress strain curve sometimes not start from zero?

Here this is a Load-Displacement curve from a compression test I did earlier with my colleges, Below is the resulted stress strain curve from the test from the lab computer why did the curve not start ...
Youssef Mahmoud's user avatar
0 votes
1 answer
32 views

"Gel" to temporary stick to glass like surfaces like a mobile phone

I am developing a product to attach to a mobile phone temporarily. I have seen these giveaway screen cleaners. Small stickers you can put on the back of your mobile phone, easily remove them and clean ...
www.jensolsson.se's user avatar
0 votes
0 answers
651 views

How do you derive the formula for converting weight percent to atom percent?

I have the following equations for weight and atom percent: Where m is the mass of each element. where A is the atomic weight of each element and m prime is the mass of each element. And I'm told ...
George Young's user avatar
0 votes
0 answers
26 views

What are good materials to make an elastic and durable diaphragm, preferably with high stiffness?

What are good materials to make an elastic and durable diaphragm, preferably with high stiffness to make a diaphragm or membrane pump for gas? Operating temperature will be between 0 and 100 degrees ...
S. Feunmajer's user avatar
1 vote
1 answer
82 views

What is the most accurate mathematical model of a cantilever beam's bending?

I read there are multiple models for it, Plate theory, euler-bernoulli, timoshenko beam theory etc Which is the most accurate for modelling the bending of a stressed cantilever beam?
Hisham's user avatar
  • 109
-1 votes
1 answer
186 views

I search for a solid material which dissolves in water very slowly, around 1 micrometre per hour measured from the water-contact-surface

I know there are some watersolutable Polymers out there like Polyvinylalcohol, but that would dissolve to fast. Is there some material that dissolves at around 1 micrometre per hour, regardless of pH ...
Tobias R.'s user avatar
-1 votes
1 answer
14 views

How does evaporation impact enthalpy calculations?

For the following question, why should one calculated the heat transfer that occurs from going from 100°C to 36.6°C? As doesn't the water reach 100°C and then vaporize instead of coming back down to ...
Berry's user avatar
  • 17
0 votes
0 answers
11 views

Why doesn't the initial internal energy matter when calculating enthalpy?

Mathematically I saw that when the initial value of the internal energy is changed when making a calculation for enthalpy using the equations: ΔH = ΔU - PΔV and ΔH = Hf - Hi, it doesn't make a ...
Berry's user avatar
  • 17
0 votes
1 answer
21 views

Why is the donor level in a semiconductor called a "level"?

To expand on my question - Why is the donor level in a an n-type extrinsic semi-conductor called a level instead of a band? Shouldn't it be referred to as a band instead, as the "donated ...
Berry's user avatar
  • 17
1 vote
1 answer
41 views

Why does a hole have greater energy than valence electrons?

According to the following diagram (this is for a p-type semiconductor) : The acceptor level - which is the hole, has a higher energy than the valence electrons as it is above the valence band. But ...
Berry's user avatar
  • 17
1 vote
2 answers
96 views

Why Green Porcelain was Used for Chalkboards

This site: https://www.businessinsider.com/why-most-blackboards-are-actually-green-and-not-black-2017-11#:~:text=The%20color%20change%20came%20in,likely%20to%20survive%20the%20journey states that ...
MeltedStatementRecognizing's user avatar
0 votes
2 answers
134 views

Do polymers undergo uniform plastic deformation?

I've learned that the yield stress of a polymer can be marked on the tip of the first curve on the stress-strain graph of a polymer undergoing a tensile strength test, like so: As the yield stress - ...
Berry's user avatar
  • 17