Questions tagged [material-science]

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1answer
27 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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0answers
30 views

What is the effect of annealing on fracture toughness and why? [closed]

Without annealing the samples showed a higher fracture toughness because of "presence of compressive residual stress." It would be great if you could slightly highlight on this.
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26 views

Burrs on the wire surface after drawing

I have been involved in wire drawing for some years now. But only recently, I noticed that the wire surface was uneven and had burrs when inspected under a microscope (see photos). The wire is a Ni-Fe ...
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1answer
41 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
52 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
10 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
8 views

Is there a name for a process of constructing gradient/smoothly distributed material density?

Are there conventional processes by which one can construct a material that gradually transitions from one alloy or molecular density to another? For instance if I wanted a material that gradually ...
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1answer
16 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
22 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
494 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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1answer
657 views

Is it possible to determine how the steel was made, having its microstructure (for example, to distinguish forging from rolled products)?

How do you think the steel in these images was made? Example1 (https://i.stack.imgur.com/oZLRM.jpg) Example 2 (https://i.stack.imgur.com/jrDE7.jpg) Example 3 (https://i.stack.imgur.com/fpl2d.jpg) ...
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1answer
26 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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0answers
13 views

Difference in the properties arising from precipitates and intermettallics

What are the key differences in the mechanical properties caused by precipitates and intermettallics in metal alloys? So far I've found that intermettallics are larger phases, and are usually hard and ...
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2answers
33 views

How effective are screen protectors?

Screen protectors are supposed to protect your devices from nicks and scratches, as well as the stress of impacts which might otherwise lead to cracks or shattering. The fundamental principle behind ...
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0answers
14 views

Readily available PVC plasticizer

I'm looking for products that can be used as non-toxic PVC plasticizers. I've used ATBC as a product that I can add to, for example, the inside of a pool toy, which with time absorbs it and becomes ...
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0answers
10 views

Would outside reinforcement increase thermal shock resistance of a glass cyllinder?

Would a glass cyllinder reinforced on the outside with tensioned glass fiber be more resistant to thermal shock than an unreinforced one? I understand that the failure happens when the glass starts to ...
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0answers
53 views

Finding fraction of liquid and solid from isomorphous alloy phase diagram

if alpha of 82% B and liquid of 57% B are in equilibrium in an alloy of 73% B,the fraction of liquid is? I know formula for it, but confused in finding property. Any help will be of great use & ...
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2answers
78 views

Machinability index for ferrous and nonferrous material [closed]

What are the machinability index for ferrous and non-ferrous materials? Please help me so that I can learn more about it. Thanks
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0answers
14 views

Verifying MERV Integrity for Specified Material

This is a question related to materials science. Essentially I want to purchase MERV 16 material from a manufacturer and I want to verify that it's true MERV 16 material when I receive the order. ...
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0answers
14 views

Is there any ecological modifier which can be added to PLA to make it not brittle, and good for some heavier-duty outdoor food-grade use?

Is there any modifier which can be added to PLA to make it not brittle, and good for some heavier-duty outdoor food-grade use? The criteria is that adding the modifier still keeps the material ...
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1answer
62 views

How to estimate the tensile strength of inch diameter steel round?

The tensile strength for 1045 TGP Precision Steel Round is said to be 91 ksi. Although, different diameters must be a factor, right? Would a 1" diameter rod be 104.5 ksi or 1045 ksi? Say I want ...
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1answer
16 views

Is there a way to visualize or quantify atomic clusters in crystalline materials?

For multi-component crystalline materials, can we detect atomic clusters containing just 2, 3, or 4 atoms? Take a material $A_4B_3C$ for example. Can we detect clusters of A with 2 atoms (pairs), 3 ...
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1answer
20 views

How many kind of material resistance are there in engineering?

I have seen many kind of material resistance mentioned scattering around, such as fracture resistance / deformation resistance / chemical resistance / weathering resistance and so on But I cannot find ...
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1answer
105 views

How is linear motion achieved in this automatic blackboard eraser?

In the animation shown below what can be the mechanism used for this purpose? I know it can be achieved by using rack and pnion gear arrangement. But how are this set up arranged in classroom ...
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4answers
4k views

Why are most jigsaw blades designed to cut on the up stroke and have teeth that point towards the shank?

Why are most jigsaw blades designed to cut on the up stroke with teeth that point towards the shank? Why are reverse teeth jigsaw blades less popular?
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2answers
106 views

How does a pressure vessel fail when the interal pressure exceeds the yield stress of the material?

When we design a pipe or pressure vessel, we look at hoop stress and longitudinal stress and then look at the material properties. We assume that the material reacts to the load as a solid. However ...
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3answers
92 views

Beginners material science for handling a load

I’ve got a reasonably strong grasp of Newtonian mechanics, but as far as material science goes I don’t know which of the many material properties I need to use to solve my problem: I’m trying to mount ...
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1answer
46 views

I have a small piece of stainless steel that I need to remove 1-2mm of material. The hardness is 200. What type of file do I need to get?

This is a part of a mounting system for an Olight pistol flashlight. The universal adapter that they include isn't so universal when it comes to a Canik handgun. I've talked to the people at Olight ...
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1answer
169 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}{\...
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1answer
39 views

What is the relationship between the strain in different directions?

A cube made of an isotropic material is subjected to a tensile stress as shown in Figure 2. What is the relationship between the strain in different directions ? There is an elongation in $z$ ...
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1answer
41 views

Stress Analysis University Report Help

I'm working on a final report for the mechanics of material course, and the project was to choose a structure or mechanical element and carry out stress analysis using solidworks and then confirm ...
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1answer
37 views

Determine compressive modulus from compressive strength data in spec sheet?

Is it possible to determine the compressive modulus of a polyethylene foam using the following spec sheet? Minicel Type M Foam It doesn’t contain any information regarding the compressive modulus, ...
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2answers
67 views

Why do they vacuum pump the carbon fiber fabric?

I have seen plenty of YouTube videos in which they use carbon fiber fabric to build various things. One such channel is Mike's Patey's channel where he makes amazing aircrafts from carbon fiber. In ...
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2answers
248 views

Calculating tensile strength for aluminium

I'm making a Z (coffee table) linkage with two interlocking C channels and a couple of steel linkage bars. While moving, they aren't load bearing but when extended, they will take a weight of around ...
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1answer
34 views

Looking for thin flexible and strong material

I have a project in which I have to use a up to 2.5mm diameter needle with a 90 degree (L shape) angle similar than the one in the following picture: I say similar because there is only the tip of ...
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0answers
1k views

Why would the flexural modulus be different than the elastic modulus?

I'm reading the Wikipedia page on flexural modulus. It is said: Ideally, flexural or bending modulus of elasticity is equivalent to the tensile modulus (Young's modulus) or compressive modulus of ...
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0answers
372 views

Is surgical and medical mask based on static electricity?

Is surgical and medical mask based on static electricity? By static electricity I mean like 3M N95 mask with at least two different layers of positive and negative static electrical layer. I googled ...
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0answers
30 views

Extreme temperature quick disconnect terminals

I am doing R&D work and am in need of terminals that can withstand 1,000 degrees Celsius, but cannot seem to find anything anywhere. The highest temperature ratings I have found are around 600 ...
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0answers
28 views

Shore durometer type D to brinells

I saw a video where a person was measuring hardness of a material with Shore durometer type D and was comparing it to steel. The screen on durometer showed 96.5 HD and I was just wondering, how much ...
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1answer
37 views

“Springiness” of rolled copper sheet

When a copper sheet is rolled into cylinder, it tends to unroll itself. Is there any name for this?
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1answer
30 views

Are ceramic materials suitable for making locking lugs for guns?

Since ceramics are resilient to shear loads, could one make locking lugs in a gun out of them or will tensile loads also be present leading to failure of such lugs? Also, could those tensile loads be ...
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1answer
25 views

What type of material can I use to make a model used for medical ultrasound practice?

I’m attempting to make a model for medical professionals to practice ultrasound guided procedures. What substances or materials would be adequate to project a picture similar to human tissue? I have a ...
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2answers
51 views

Alternative to silicone that is non insulating

we are developing a product and would like to use silicone, as it has good texture and durability, however it is an insulator. We would like heat to be able to pass through the silicone rapidly. Does ...
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0answers
21 views

Would Amorphous Diamond-like Carbon coatings have a fatigue cycle limit?

I'm aware that polymers like most plastics can go through stress cycles indefinitely as long as the covalent bonds are not ruptured. On the other hand, I hear that even metals like steel and ...
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1answer
120 views

Calculating Entropy from Gibbs Free Energy?

I guess Cp = dH/dT= dq/dT=dS Thus SdT = integral of CpdT. From that ∆H is given and we can calculate ∆G. However, entropy for this reaction should be -7.4J/molK and I am getting like 26J/molK. Also S ...
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2answers
47 views

Precipitation Hardening

Please explain the meaning of this statement with close reference to Precipitation hardening,"The relative rates of nucleation and growth are controlled by temperature. The size and dispersion of the ...
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1answer
47 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 ...