Questions tagged [material-science]
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25
questions
0
votes
1answer
18 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 ...
4
votes
1answer
82 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 ...
11
votes
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?
2
votes
2answers
68 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 ...
1
vote
3answers
85 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 ...
2
votes
1answer
36 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 ...
-1
votes
1answer
62 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}{\...
2
votes
1answer
31 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 $z$ ...
-1
votes
1answer
36 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 ...
1
vote
1answer
22 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, ...
0
votes
2answers
44 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 ...
1
vote
2answers
91 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 ...
1
vote
1answer
31 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 ...
1
vote
0answers
50 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 ...
1
vote
0answers
287 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 ...
0
votes
0answers
27 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 ...
1
vote
0answers
27 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 ...
1
vote
1answer
34 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?
1
vote
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 ...
1
vote
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 ...
0
votes
2answers
49 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 ...
1
vote
0answers
20 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 ...
-1
votes
1answer
29 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 ...
0
votes
2answers
39 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 ...
1
vote
1answer
43 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 ...
