Questions tagged [material-science]

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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
44 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
44 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
46 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
118 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
396 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
35 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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2answers
3k 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
434 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
33 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
31 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
64 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
22 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
372 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
48 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
57 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 ...

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