## Materials Science C

EastStroudsburg13
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### Re: Materials Science C

Hey guys, do you think going through previous years tests and trying to understand the material would be a good idea?

I didn't see any previous conversation on how the test has changed, so what do you all think about that?

Thanks.
I'm not super familiar with past tests, but I can't imagine they are not at least very similar in terms of content. Materials science is pretty standard as a field at this level.
Just wondering, do we have to learn calculus for this event? I'm a junior, so I take calculus next year, but I noticed that derivatives are used to determine creep while differentials are used to determine viscosity. In other words, do we have to compute numerical for creep or viscosity, or are we going to be required to qualitatively determine them (for example, listing liquids in order of increasing viscosity)?

Thanks!
They will probably not have you use pure calculus. However, they may well give you a set of hypothetical experimental data, and say "find the creep of this material based on the data". So you're not taking a mathematical derivative per se, but you're taking the rate of change for different intervals, which falls more under the sort of algebra that is typically required for Division C, even though it's technically based on calculus.
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Skink
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### Re: Materials Science C

I don't believe the Callister book covers contact angle, surface wetting, surface tension, etc. The Askeland & Haddleton book does cover most of that. (Typically, "Materials Science" refers to solids, which is what most introductory courses will focus on - although this event also applies to liquids - so you may not see those topics in every Materials Science reference).
This answers a question I asked in YDRC during the preseason; thank you. We've been mostly relying on Callister with supplementary materials from elsewhere, but I'll locate a copy of this now.

ReverseCold
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### Re: Materials Science C

According to Wikipedia creep begins to occur at around 35% of the melting point of a metal. On one of the tests in the exchange (New York State, Q5), it gives a metal with a melting point of 1240C and asks to find what temperature the metal will creep at. 35% of 1240 is 434, which made me choose A. The key says C. How does one get C? (231C)
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Unome
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### Re: Materials Science C

According to Wikipedia creep begins to occur at around 35% of the melting point of a metal. On one of the tests in the exchange (New York State, Q5), it gives a metal with a melting point of 1240C and asks to find what temperature the metal will creep at. 35% of 1240 is 434, which made me choose A. The key says C. How does one get C? (231C)
Conversion to Kelvin gets pretty close.
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angelnugroho
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### Re: Materials Science C

Hey ya'll! I'm planning on competing in Materials Science and I'm trying get study materials. The materials science wiki page seems to have issues loading images for some pretty important terms and subjects.
For instance, on the list of basic terms it comes up with this:
Stress - Force per unit area. Represented by Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \sigma

I don't think it's a problem on just my end, so here's hoping this gets fixed soon or isn't too important
Thanks!

Unome
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### Re: Materials Science C

Hey ya'll! I'm planning on competing in Materials Science and I'm trying get study materials. The materials science wiki page seems to have issues loading images for some pretty important terms and subjects.
For instance, on the list of basic terms it comes up with this:
Stress - Force per unit area. Represented by Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \sigma

I don't think it's a problem on just my end, so here's hoping this gets fixed soon or isn't too important
Thanks!
Yeah, Latex on the wiki has been broken for a while. If you want to see what it says, you can copy the last section (in this case \sigma) onto an online latex generator, such as this one.
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andrewwski
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### Re: Materials Science C

According to Wikipedia creep begins to occur at around 35% of the melting point of a metal. On one of the tests in the exchange (New York State, Q5), it gives a metal with a melting point of 1240C and asks to find what temperature the metal will creep at. 35% of 1240 is 434, which made me choose A. The key says C. How does one get C? (231C)
Conversion to Kelvin gets pretty close.
Yep, remember that Celsius is NOT an absolute temperature scale, so doing multiplication/division in it is meaningless. You need to convert to Kelvin, do the multiplication, and convert back to Celsius.

Choice A was purposely put there for those who forgot to convert to Kelvin.

BuildingFriend
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### Re: Materials Science C

Hey everyone,
I've been decent at Materials science (only 3rd at Cornell and 6th at Yale ) but if there were any suggestions people had for cheatsheets that would be great. At the moment it's a bunch of condensed knowledge of general things, but that's pretty much down squat. We're working on getting more obscure knowledge like data tables, alloy names, graphs, charts, etc. If anyone had suggestions, pictures, or advice, that'd be great! Good luck to everyone this year!
Fermilicious

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### Re: Materials Science C

What type of labs have people been seeing so far this year? The ones I've seen have been pretty consistently on the same couple of topics so it'd be nice to know what else people are making labs on.
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Skink
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### Re: Materials Science C

What type of labs have people been seeing so far this year? The ones I've seen have been pretty consistently on the same couple of topics so it'd be nice to know what else people are making labs on.
My team got a really badly designed one (test in general, with the lab being the best part, unfortunately), something about literally dropping a liquid and measuring...some physical property...I'm pretty sure this was beyond the scope of the rules. I don't expect the activities to deviate far from the sample ones (see the Mat Sci ES page linked from the National site) unless the event supervisor has a background, at any rate.