All Questions
22
questions
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answers
52
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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 ...
- 121
1
vote
1
answer
73
views
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?
0
votes
4
answers
211
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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.
0
votes
1
answer
64
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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 ...
- 1
0
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0
answers
13
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How can I calculate the maximum center load on a horizontal cellular glass tile; supported along its edges, before it breaks?
Insulating cellular glass boards or tiles are designed to sit on a flat load-bearing surface. I want to consider the situation where the base is concave so the tile is only supported on its edges. I ...
2
votes
0
answers
28
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What determines the rate of electron discharge machining (EDM) for different materials?
Wire EDM makes no contact with the work piece and disregards hardness.
I am using EDM to cut different materials, and I notice a clear distinction between the rate each material gets cut. For example, ...
- 131
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votes
1
answer
311
views
What's the difference between amount of phase and chemical composition of the phase
I don't understand the difference between chemical composition and the amount of phase, why does the chemical composition of the phase not add up to 100%. For example in the image below the chemical ...
0
votes
1
answer
28
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What is the effect of lateral friction on the specimen shape
During compression test lateral friction occurs on the lower and upper surfaces of the specimen how does this affect the final shape of it and how do we reduce this effect?
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votes
0
answers
52
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How do you plot a relation between hardness and strain
How do I plot the relation between hardness of a material and compressive strain knowing the stress-strain curve and indentation size in Brinell's hardness test
0
votes
1
answer
622
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Why does the stress strain curve sometimes not start from zero?
Here this is a Load-Displacement curve from a compression test I did earlier with my colleges, Below is the resulted stress strain curve from the test from the lab computer why did the curve not start ...
-1
votes
2
answers
90
views
Is ultimate tensile strength is constant for a material?
Is ultimate tensile strength is constant for a material? I have performed a tensile test of a frame tube and I made the dumbbell for tensile test.
The test specimen (A) has a thickness 2mm while test ...
- 57
1
vote
0
answers
29
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Requirement : Open Source API providing properties of engineering materials [closed]
We are a bunch of four in the ultimate year of the 'Bachelor of Engineering - Mechanical' degree. Our final year project is titled 'Computer-Aided Part-Code Generator for industrial parts'.
For the ...
- 11
2
votes
3
answers
101
views
Difference between fast or slow rising force on materials' breaking strength
Assume that force is applied to a material like a rope, steel cable or a beam until it tears apart.
Does it make any difference for the breaking point if the force rises slowly or really fast?
- 21
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votes
2
answers
515
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What is meant by Material Toughness being the Ability to Absorb Energy Before Fracture?
Toughness is defined as ability of material to absorb energy when deforming before fracture. Materials with high ductility and strength will have high toughness.
What is meant by ability of material ...
0
votes
1
answer
24
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Rubber that remains Elastic in Hot and Dry Application
I work for a valve manufacturing company and our customers have an application where very large volumes of hot (200F), dry air pass through our valve. As a consequence, the rubber (carboxylated ...
- 1