Thermal Expansion

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zahirazam2009 Active Contributor Join Date: Oct 2013 Location: CHENNAI, India. Posts: 13	Thermal Expansion 11/05/2013 4:55 AM
	in ASME sec II part D, coefficient of thermal expansion is given from the range of 20 degC to 900 degC, but who to find the what will be its value at negative temperature like -45 degC???? __________________ Attitude is the little thing that makes a big difference!!
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: thermal expansion 11/05/2013 4:57 AM
	There's nothing particularly exciting about 20degC. Provided the material has no phase change, extrapolation to -45degC would be a good first approximation. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Fredski Guru Join Date: Feb 2011 Posts: 7025 Good Answers: 207	#2 Re: Thermal Expansion 11/05/2013 7:53 AM
	expansion being the key word.
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SHOCKHISCAN Guru Join Date: Nov 2007 Location: Eastern Arizona mountains on Route 666 about a mile from God's country Posts: 1676 Good Answers: 122	#3 Re: Thermal Expansion 11/06/2013 8:44 AM
	Wouldn't the -45C temperature condition result in a "negative" coefficient thereby yielding a "negative" thermal expansion phenomonon? __________________ They said; "Brain size?" I heard; "Train size?" so I said: "I'll take a small one, thank you."
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Ried Guru Join Date: Dec 2005 Posts: 1602 Good Answers: 19	#4 Re: Thermal Expansion 11/06/2013 5:57 PM
	I would think a bigger concern might be the increase of material brittleness at -45. __________________ Eventually, one needs to realize that it is far less important to be the smartest person in the room than it is to sit next to that person and make friends.
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Mukesh0861 Power-User Join Date: Dec 2010 Posts: 377 Good Answers: 20	#5 Re: Thermal Expansion 11/16/2013 12:55 AM
	PWSlack has suggest the most appropriate way to find the best approximation of value of coefficient of thermal expansion at -45°C.
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Fredski (1); Mukesh0861 (1); PWSlack (1); Ried (1); SHOCKHISCAN (1)

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