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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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I was solving fluctuating load problems and the word "static" confused me

Here's a snippet of the question that was asked a couple of years ago in university exam: A cantilever beam made of cold rolled steel for which ultimate tensile strength =540 MPa and Yield tensile ...
user47882's user avatar
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Seeking Advice: Improving Resin Application in Honeycomb Lamination for a Sustainable Project

I am trying to laminate a honeycomb structure with a fiberglass and resin reinforcement. However, I have problems because a large amount of resin falls through the holes of the honeycomb and the final ...
BeeSwell's user avatar
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How do I predict electrical mean free path in nanostructures

How does one roughly predict the mean free path for electrical conduction in a nanostructure at different temperatures and under different electrical conditions such as different voltages and ...
ProfessorMoreRight's user avatar
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Which aluminum alloy is used in cheap commercial load cells?

I am planning to simulate a load cell in CAD and was wondering which aluminum alloy are cheap commercial load cells made of? I noticed there is no huge difference between the common aluminum alloys in ...
DailyReader's user avatar
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Mechanical fasteners for HDPE pipe and sheet?

I need to fasten pieces of HDPE together but I’ve heard gluing HDPE is difficult. I've bought sheets and pipes to make a feeder for a tortoise. I will be using the sheets for covers for the pipes. The ...
Lovingtrout1034's user avatar
8 votes
3 answers
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How does a church built from stones survive 70 years under water?

Following the recent news about the Sau reservoir in Spain, the draught revealed an 11-century stone church which has been under water for 70 years since 1962 when the reservoir was built. How is it ...
Honza Zidek's user avatar
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1 answer
29 views

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 ...
Patrick12341's user avatar
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What Manufacturing Process Is Needed To Stretch Vinyl Material Around A Cushion With Complex Curves While Not Creasing The Vinyl?

What manufacturing process is needed to stretch vinyl material around a cushion with complex curves, while not creasing the vinyl? The accompanying image exhibits a cushion that is a result of the ...
Ambassador's user avatar
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Why are direct stresses at crack surface non-zero, but shear stresses are zero?

I'm studying ceramics, more specifically, modelling failure intensity under compression. Apparently, the shear stresses at crack surfaces are 0 because they are a free surface. However I don't see how ...
ThePhysicsOverthinker's user avatar
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Grade C surface plate

Surface plates come in three grades: AA, A and B. The AA grade has the best flatness, while grades A and B have respectively 2 and 4 times less accuracy. Grade B is still much flatter than normal ...
Riemann's user avatar
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Optical table without holes

Most optical tables have holes. Are there also optical tables without holes? Or do these things have a different name?
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Heat press for low density polyethylene sheets

I want to create a double layer sheet with custom internal channels (created with CAD or similar software) out of two low-density-polyethylene sheets, similar to those used as greenhouse cover. Is ...
Oculatus's user avatar
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British Standard Steel BS5S82 propagation properties

I am looking for propagation data for the BS5S82 material (case hardened). I checked in MMPDS and ESDU but to no avail. does anyone know where I can find this data? Or at least similar materials in ...
Toufique's user avatar
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Will petroleum jelly degrade silicone elastomer?

I have gotten conflicting information on this question. If I put a bit (1/4 of a cc) of vaseline on a silicone elastomer part and then apply gentle pressure for hours will this degrade the elastomer? ...
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Manufacture of High Temperature Superconductor Circuit Trace

How would you go about making circuit traces out of high temperature superconductor (HTS)? Low temp superconductor traces have been made with pure tin, lead-tin, etc. But those materials are much ...
16toron's user avatar
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1 answer
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Why marine steel is not always used in cooking applications

What are the main reasons why marine steel such as 1.4404 (316L) grade is not solely used in cooking and kitchen applications? Other than cost possibly? Why other grades such as 1.4301 (304) are so ...
Imsa's user avatar
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1 answer
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What is fracture toughness and how is it different from the strength of a material?

Strength is just the amount of force that an object can take before breaking, so what is fracture toughness?
JohnBremer300's user avatar
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4 answers
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What's the difference between ductility and stiffness?

As far as I understand they both relate to the amount of deformation based on a given amount of stress.
JohnBremer300's user avatar
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3 answers
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Can someone help explain the difference between strength and stiffness?

I just can't seem to get it through my head and I don't understand the difference. As far as I can understand, strength is a materials resistance to permanent fracture while stiffness would be ...
JohnBremer300's user avatar
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What substances have the lowest dielectric strength (volts/meter)?

All the tables of dielectric strength I can find are lists of materials that engineers use as practical insulators, and air is usually the least insulating thing on the list. Where can I find a more ...
interfect's user avatar
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Single Photon/Electron Emitter

Is it possible to buy single photon/electron emitter in market for experimental purposes? If yes, can you please guide me where and how?
Ok-Virus2237's user avatar
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Belt conveyor roller spring

I wanted to know if anyone could help in this area. I want to create an inclined conveyor belt where, when a cargo box reaches the top of the conveyor belt, the rollers sequentially move down (maybe ...
ramine khadem's user avatar
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Electrical Charges

I have been doing some research on different textile materials and electrical charges. If I wanted to change a negatively charged material to a positive one, would that be possible? Thinking I could ...
HDrum's user avatar
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1 answer
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Is there any elemental pieces template (blank) which together forms a corrugated box of desired size, or is there anything similar to it?

We run a corrugated box business. I have known elements in chemistry; I was thinking, whether similar to them, there are any elemental corrugated box templates (dieline; keyline) which together form a ...
Sensebe's user avatar
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3 votes
1 answer
113 views

How do I electrically charge a sheet of plastic strongly enough that it firmly sticks to the wall?

electrostatic whiteboards I have a bunch of these special dry erase sheets. Someone gave them to me as a gift about a year ago; I see they are still available for purchase on the Internet — you can ...
Ignat Insarov's user avatar
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How to attach plates (my design) to the stator core of the machine more efficiently and precisely?

I am working on an electrical engineering project. However, I have come across a specific mechanical engineering problem. I have attached an image to describe what I want to do. I have primarily a ...
Hassan's user avatar
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Determine moment and shear stress door

Determine shear stress and moment of bolt: Internal Height of Door = 198.2 cm Internal Width of Door = 89.9 cm Thickness Door = 3.9 cm Weight Door = 45.76 kg or448.9 N Elasticity = 9.8 GPa or N/mm2 ...
Lavin's user avatar
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2 answers
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Is there any special coating or paint that will strongly bond to an automobile tire's tread and can be driven on?

I would like to know if there is any special coating or special paint that can be applied to the tread of an automobile tire, strongly bonding to it, and which is strong enough and durable enough to ...
user57467's user avatar
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0 answers
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ASTM B209 does not list Aluminium Alloy 1070

This is my first post. We manufacture products using various grades or alloys of Aluminium sheet, one of our common alloys is 1070. In referencing the ASTM B209/209M-21a standard I do not see 1070 ...
John's user avatar
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What kind of sensor is ideal for measuring the eccentricity of a threaded shaft?

I am supposed to come up with an eccentricity measurement system for surfaces. What kind of sensor/configuration is most ideal for such an application(in the generic sense).
InstruStudent's user avatar
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45 views

Helicoil-Screw Torque Spec

My project incorporates the use of various metals and plastics to include ABS, G10, aluminum, titanium, and brass, and we drill and helicoil all mounting screw holes. I'm having a bit of difficulty ...
Jedi Engineer's user avatar
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1 answer
69 views

Does yield point of steel depend on thickness?

I have two different plates of different thickness and I need to calculate yield point. Does yield point of steel plate changes with changing of plate thickness?
Akshay Wagdole's user avatar
-1 votes
2 answers
73 views

Electricity generation from sand particles in airstream hitting surface [closed]

I read an experiment which demonstrated that metal filings fired at a surface using air blasts charges the particles, surface and airstream. I understand this is triboelectricity, resulting from ...
El Flea's user avatar
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How could we aproach development of touchscreen with morphing surface or morphing keyboard?

There is this technology of braille e-readers. It is relatively simple and reliable but it never had much commercial success probably because small customer base. In past a company called Tactus tried ...
Martin Pavlíček's user avatar
1 vote
1 answer
57 views

What is this filter from an aluminium extrusion facility filtering?

i work for a subcontractor tasked with cleaning these parts from an aluminium extrusion facility. essentially we have tried all sorts of different methods when cleaning them and i am just trying to ...
Ashley Reid's user avatar
0 votes
4 answers
82 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
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1 answer
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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
1 answer
88 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 ...
v1nce's user avatar
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0 votes
1 answer
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Rotation of a tube

See image... why is it that in part 1 the answer is negative but in part 2 it is added instead of subtracted? I thought because I got a negative in part 1 I would have to subtract in part 2 but the ...
user22718620's user avatar
1 vote
3 answers
43 views

Can a decent grade stainless steel preserved in a optimal environment last for trillions of years? Or would it at some point ,turn into dust

Can a decent grade stainless steel preserved in a optimal environment last for trillions or gazillions of years? Or would it at some point ,eventually turn into dust or even smaller like into atoms.
Jay's user avatar
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0 votes
1 answer
30 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
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0 answers
31 views

Which formula to use to calculate the main vibratory frequencies of a wooden joist floor? (8 Hz?)

When a wooden floor joist is a little undersized, there is a vibration phenomenon when walking on the floor. In some forums, I've often seen a frequency of 8 Hz mentioned when walking on the floor, ...
Basj's user avatar
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0 votes
1 answer
55 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
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0 votes
1 answer
96 views

What would be the best capacitor to use for a railgun that uses a capacitor as the projectile?

I have had a long-time interest and fascination with railgun technology and for a long time I have wanted to build a small-scale, simple railgun as a scientific experiment. This railgun is designed to ...
user57467's user avatar
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0 votes
1 answer
48 views

Price of e-beam evaporator [closed]

I'm trying to find an accurate price estimate for an electron beam evaporator for a research project. The intended application is for use in large-scale manufacturing. How does one usually go about ...
anfjnn's user avatar
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0 votes
2 answers
81 views

Failing engine A-Mount (bad design by the automotive manufacturer?)

I currently own a Tata Nexon Petrol car (in India) where I have seen (on facebook, Telegram, WhatsApp owner groups and youtube) that the A-Mount on the engine has suffered multiple failures for some ...
Akay's user avatar
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1 answer
52 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
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36 views

Lubricants for dissimilar metals

We are trying to maintain a Grubb telescope built in 1875. We think that the bearing surfaces are either brass to brass or brass to cast iron. Can anyone help with types of lubricants that could be ...
John Webb's user avatar
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0 answers
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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 ...
Thian Daniel Iskandar's user avatar
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0 answers
42 views

Tolerances in the manufacture of mechanical parts (plastic)

It is necessary to make an adapter ring for connecting the smartphone to the microscope eyepiece (turn from ABS on a lathe, or 3D printing). Microscope eyepiece diameter is 33mm. What should be the ...
minto's user avatar
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