Discussions on Materials Science
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So, we have this new Commons domain, "Engineering", and I've created a type called Material since that was my immediate need. I know Danny's done some work on Materials Science in his base of the same name.
I'd like to consider Danny's solid material type for inclusion in this commons -- or rather, copy across properties as relevant. But I know too little about materials science to know whether it's modeled as best it can be. Perhaps those people with more knowledge of the subject can help out?
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Having had a look at solid material, I think its a great start. I'd like to help out and improve this by suggesting the following:
The schema currently has 6 properties to measure hardness. It might be better to have one property called "hardness" and alter the 'hardness specification' type to have an additional property called "test used" which expects a type of 'hardness test'. (we can type most of the topics in http://en.wikipedia.org/wiki/Category:Hardness_tests as 'hardness test').
The same approach should be applied for strength. One property called strength which expects a CVT called "strength specification". strength specification would have a property called "strength term" expecting an enumerated type 'strength term' (yield, compressive, tensile, fatique, impact). It would also have a "measurement" property expecting a type of MegaPascals.
I think thermal conductivity should actually expect a type of Watt per metre per Kelvin? the description should specify "thermal conductivity when measured at a temperature of 273K". (or have a CVT of property 'measurement' expecting type of Watt per metre per Kelvin, and a property "temperature at which the measurement was taken at" expecting a type of Kelvin)
There are a few more additional properties which should be included:
- melting temperature - expecting a type of Kelvin;
- Specific heat capacity - expecting a CVT of measurement (Joules per gram per kelvin), temperature measured at (degrees C), and comments (text).
- Coefficient of thermal expansion - expecting a CVT of Per Kelvin and dimension (linear/area/volume).
Metal should be a seperate type, but have solid material as an included type. Properties specific to metals would be:
- Boiling temperature - expecting a type of Kelvin.
- Shear Modulus - should this be a metal only property?
- Bulk Modulus - expecting a type of GigaPascals.
- Latent heat of fusion - expecting a type of Joules per gram.
- Latent heat of vaporization - expecting a type of Joules per gram.
- Crystal structure - expecting an enumerated type called "metallic crystal structure" (values would be body-centre cubic, face-centred cubic, hexagonal, diamond)
I saw the schema had types for electrical material and optical material already, so properties relevant to these can go there.
Comments please......
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I've created a draft incorporating my comments on Solid material here. Let me know your comments.
Above, I had suggested a number of properties which are relevant to Metal only. I'm not sure that is fully the case - the reference material I was working from only showed that sort of data for metals only, and I jumped to a conclusion.
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iain, you are so good at this stuff.
the wikipedia template for chemical elements has alot of this stuff that i can parse for you if we want to start filling in some data on boiling temp etc.
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kiriily, any chance of getting in contact with danny? he hasn't logged in since febuary.
can you promote, or move a bunch of his types like electrical material and optical material over to engineeringdraft? do i need to make a jira for this?
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