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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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20 views

Ductility of Fe-Ni Alloy

Cold worked Fe-Ni rod is very brittle and not suitable for drawing. What would be the best heat treatment parameters for increasing the ductility of a Fe-Ni Alloy? Does increase in the Co content make ...
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14 views

Determining the minimal needed wall thickness between two bores in a control block

Given a control block of simplicity with only two bores. These two bores could be parallel or just could be very close to each other at a specific point in the control block. The material of the ...
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1answer
31 views

Is it possible to cast copper around another metal

So i have seen these super conductor rods around (which appear to be copper around titanium/niobium). Now I am wondering (for a maker usecase) if its possible to create something similar by for ...
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Is there such a material that is resistant to torque while easily stretching when under torsion?

I need a shaft that can be stretched along its length while also being resistant to torque enough to be a functional shaft (see pictures). I have a rotating sphere within another rotating sphere, ...
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What is the difference between $K$ ,$K_{IC}$ and $K_t$?

I have seen three representation of stress concentration factor values $K$,$K_{IC}$ and $K_t$ now all that I know is $_I$ in suffix represents opening mode of crack.The suffix $t$ stands for tip....
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What's the most anisotropic material? Is there a dense stiffness matrix?

The stiffness (aka. tangent modulus of the stress) can be represented as a symmetric 6-by-6 matrix, i.e. it has 21 independent components in the most general case. In the linear case, this matrix is ...
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1answer
27 views

Silicone paste vs. silicone grease vs. silicone spray lube

For purposes of usage in home/auto and light industrial circumstances, what are the differences? What are the pros and cons, and suited uses, of each? Thanks!
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15 views

What material characteristics are most important for heating element material selection?

I want construct a heating element by screen printing a flat coil pattern of conductive paste onto an insulated substrate. This conductive paste consists of a powder of conductive metal contained in a ...
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1answer
57 views

Calculating shaft diameter

I'm designing a circular shaft that's going to carry a spread radial load of about 200kg and also transmit a 160Nm torque. I'm not very familiar with materials but what I'm guessing I'll be able to ...
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1answer
28 views

Creep behavior in metals

If creep behavior can begin at 0.6T(melting) but, hot working for a pure metal starts at 0.4Tm, what is the explanation for this?
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14 views

Can crosshead movement be used to measure strain in tensile testing instead of an extensometer?

I am trying to design and build a low cost tensile test machine for plastic specimens. Most machines I've seen measure strain data using an extensometer, either the clamp-on type or the noncontact ...
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12 views

Electric Current Based Shape-Memory Alloy

Would it be possible to create a piece of metal, made out of an alloy or combination of alloys, that undergoes a shape-memory-esque change in structure in reaction to an electric current? Could it ...
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Modulus of Rigidity (Shear Modulus) of string

Does anybody know of what magnitude should the Modulus Of Rigidity of a wool string should be? I know that neither wool or string are "materials" but if anybody can give me a rough estimate of a value ...
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2answers
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Materials science and materials engineering

Good day, I would like to enquirer the followings: What is the difference between studying materials science and materials engineering? Are there any jobs exclusive to those who have studied ...
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1answer
28 views

bending rigidity of a metal rod

Say you have a metal rod with a square cross section (say 10cm by 10cm) of a certain length. You'd like to make it less prone to bending. Is it better to: keep it the way it is or remove material ...
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1answer
40 views

How do I calculate the compressive strength of a wall?

I literally just have a thin steel wall that stands vertically with a load on top. The thin edges of the wall are oriented vertically with the load applied on top of the top thin edge, with the large ...
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2answers
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Press brake tooling for 360 tube?

I’m trying to find out if it’s possibly to form a cylinder or tube with a diameter of 1 inch using some kind of curling die for a press brake. I’ve seen dies that make small 360 degree bends like that ...
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1answer
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What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?

What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?
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Optimization of ash stockpile height to minimize haul truck fuel costs

How would I find out the optimum height of an ash stockpile in order to minimize diesel haulage costs, for a CAT haul truck? My stockpile height is required to be between 25m to 50m. I have worked ...
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39 views

Calculating thickness of steel rod to support x weight?

I am building a workout area and would like to include a pull-up bar. So I have two 6"x6" wood beams planted in the ground 10 feet apart and will drill holes through them and place a steel bar through ...
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1answer
15 views

is there any relationship between endurance limit and tensile strength for thermoplastics?

i want to know about the relationship between fatigue strength and tensile strength for thermoplastics especially PPSU (POLYPHENYLSULPHONE)@23 DEG.
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1answer
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Is there a relationship between depth/diameter/etc… of meteoric craters and the strength (eg:compressive strength) of the target material (sand…)?

So I am trying to write a high school research paper (3700 words) on the topic above. I am not sure if there is such a relationship, but I think intuitively we can agree that different materials will ...
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2answers
89 views

What is a material that allows air to pass but not water vapor?

What are some materials that allow air to pass but not, or to a lesser extent, water vapor? Here are two materials I am aware of: Teflon is a material that allows water vapor to pass, but not air. ...
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3answers
80 views

What happened to the projectile in Hypervelocity Impact tests?

I recently saw a tweet about Hypervelocity Impact Sample and someone ask how is it possible to shoot a projectile at that speed and what happened to the used projectile when hitting the shield. I ...
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1answer
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Carefully attaching Pt-wire to mild/carbon steel surface

Problem: I have a near 100% Pt wire (25 AWG / D ≈ 0.45mm) that I would like to attatch to a cold rolled steel (E235 / EN 1.0308) surface. Assume this surface is flat. Goal: Keep wire attached to ...
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What should be the material and thickness of front pillars to stop car (~1,847kg and ~262 km/h) without killing the driver?

"Tesla Model 3 owner died in a tragic accident with a semi truck. The Model 3 went under the truck’s trailer resulting “in the roof being sheared off as it passed underneath,” which is known as a “...
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0answers
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Will a cyclic heat load transform my martensitic steel? How fast?

I have a plunger - that I'm using for glass forming - made out of a martensitic steel. Glass is at 1000°C and since martensite is a metastable phase, should I expect the properties of my plunger to ...
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24 views

How to write the equilibrium stress equations for a hollow, rectangular beam?

I have a system consisting of a hollow, rectangular cantilever beam (pictured below). I'd like to write the equilibrium stress equations à la the Cauchy Stress notation. How do I account for the ...
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9 views

Heat press of vinyl on 100% polyester fabric

I want to customise a piece of fabric that is 100% polyester (exclusive of decorations, wash at 30º) with vinyl. My idea is to use a vinyl cutter (such as Silver Bullet) to cut a pattern on the sheet, ...
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1answer
28 views

Material for filling small air leaks

Often beeswax is used to seal small air leaks on some musical instruments. One of the disadvantages of beeswax is that it has a melting point of around 140 degrees Fahrenheit and can therefore flow to ...
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0answers
12 views

Anyone facing issues with a compact roller press machine?

I am currently facing a problem with the machine above. When I try to compress something using the roller machine, sometimes my sample will have "scratch" marks after coming out. There are no foreign ...
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0answers
16 views

“bubbles” forming after heating my Thin film transistors

I am fabricating Bottom gate Thin-film-Transistors. The Gate is 60nm Molibdenum. The dielectric structure changes with the table below. The temperature represent the annealing temperature after ...
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1answer
55 views

Material to absorb very low frequency radio

Is there any material that will absorb very low frequency radio light? I know that stealth aircraft use radar absorbant materials in their design that absorb radio light best at certain frequencies, ...
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0answers
22 views

Static charge, PVC pipe and water

I know it's possible for a PVC pipe to develop a staic charge due to fluids flowing through them. This is a twist on that idea. Can a sealed length of pvc (say 3.5 feet in length) - tethered below ...
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30 views

Factors for Rope Elasticity

What factors, given the same material, change the elasticity of a rope? For instance, nylon rope can be configured to stretch elastically anywhere between 5% and 30% under a specific load. This is ...
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0answers
21 views

What is a common polarizing 50/50 beam splitter cube coating

I am having problems locating references of the typical thickness and material of the coating along the hypotenuse side of 50/50 polarizing beam splitter cube. Does anyone know what these coatings ...
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1answer
44 views

Adhesion of Super Glue (containing ethyl cyanoacrylate) and PVDF (polyvinylidene fluoride) film

Would it be considered safe to use super glue, which contains ethyl cyanoacrylate, to attach a PVDF film to a metal alloy? It says super glue is not recommended for polyethylene or polypropylene. ...
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3answers
83 views

Will electroplating a ventilated brake rotor with copper improve its cooling capacity and maximum its lifespan?

Since copper is excellent at dissipating heat and does not rust, I am surprised that brake manufacturers do not electroplate cast iron/steel brake rotors with a thin layer of copper (~.5mm). There are ...
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2answers
57 views

Why are moulds sometimes dimensionally larger than the metal components they make?

I have this question and I can't seem to find any sources which I can used to determine a potential answer.
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0answers
22 views

What is the smallest grain size achievable using mechanical methods?

What is the smallest grain size achievable (both theoretical and practical) using mechanical methods to crush a fracturable mineral composed primarily of a single molecular species? Example minerals ...
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0answers
10 views

Viscoplastic model of solder alloys

I have found some data of viscoplastic Anand model for the SAC305 solder joint of electronic devices in the literature. Does this data depend on the thickness, length and width of the joint? I mean ...
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3answers
50 views

Calculate area of mesh?

I have expanded steel mesh that I use to make garden cages: I would like to know how much sunlight the mesh blocks. I think I need to calculate the area that the mesh takes up (per square inch) and ...
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3answers
203 views

Jet Boat Engine Part Identification

If anyone can provide me information about this part right here, please tell me.
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2answers
67 views

Material that holds shape when stretched

I'm looking for a lightweight material that will hold its shape when stretched out. Something like a rubber band that doesn't snap back. So it starts out small, but once it's stretched it stays large. ...
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0answers
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Rust formation on Cold rolled carbon steel(SPC 270D)

We are using Cold rolled Carbon steel(SPC 270)grade. We have observed rust formation due to exposure to air(8-12hrs). The rust analysis resulted 1.6% chlorine whereas allowable limin is <0.01%. Air ...
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3answers
120 views

Tube Strength vs Pipe Strength

I've been going down the rabbit hole as far for pipe vs tube and have ran into the same statement from co-workers and on the internet. That statement is "TUBE IS STRONGER THAN PIPE" https://www....
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2answers
175 views

How to make sure the material is titanium?

I am looking for non-destructible way which can be performed in home conditions to tell if the material is titanium (in my case it is a mug). Advices like "grind it" or "use electronic microscope" ...
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1answer
31 views

What are equations related to the compaction of composite metal powders?

Say I am trying to create a metal composite and have a mixture of 3 different metal powders each with varying weight %'s. I'm going to compact them into the shape of a ring by applying a force P. The ...
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3answers
36 views

Thermal Non-Insulators?

I need a clear material that will allow sun in but won't insulate heat. Sun sun rays get in but doesn't trap heat. Any ideas?
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2answers
46 views

What is the meaning of line and points in the schematic of a polymer

In the engineering material book. It shows the following figure The following is the text to depict the picture "The origin of rubber elasticity is more difficult to picture than that of a crystal or ...