- #1

DHA

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Hi all

I am a newbie here, so please go gentle

It is along time since I have had to use Thermal Co-efficients of expansion for various metals.

However, I am trying to tie in some figures I have been given to what I know to be reality.

i am sure that I am doing something basically wrong, or the whole theory of such science will hve to be re-written

Now I know that aluminium expands at a rate of 1 or 2 mm per metre ( depending on colour ) I am involved here with the flashings on buildings , so thicknesses from 0.9mm to 3mm thick )

Given that knowledge ( unless the building industry is wrong ) I have been given a co-eff of 22.2 x (10 power -6) m/m K (Not sure how to get -6 as supertext )

How do I relate that back to a dimension of 2mm or so that I am familiar with ( I am sure I can not count the right number of zeros ) but hey it's well over 40 years since I did this and a good 50 since I did it at school

Much appreciated

A confused Old Timer

DHA

PS Perhaps I should add ~ I am moving decimal point 6 places to left, then 3 to right (to bring to mm ) obviously wrong as it is no where near ??

I am a newbie here, so please go gentle

It is along time since I have had to use Thermal Co-efficients of expansion for various metals.

However, I am trying to tie in some figures I have been given to what I know to be reality.

i am sure that I am doing something basically wrong, or the whole theory of such science will hve to be re-written

Now I know that aluminium expands at a rate of 1 or 2 mm per metre ( depending on colour ) I am involved here with the flashings on buildings , so thicknesses from 0.9mm to 3mm thick )

Given that knowledge ( unless the building industry is wrong ) I have been given a co-eff of 22.2 x (10 power -6) m/m K (Not sure how to get -6 as supertext )

How do I relate that back to a dimension of 2mm or so that I am familiar with ( I am sure I can not count the right number of zeros ) but hey it's well over 40 years since I did this and a good 50 since I did it at school

Much appreciated

A confused Old Timer

DHA

PS Perhaps I should add ~ I am moving decimal point 6 places to left, then 3 to right (to bring to mm ) obviously wrong as it is no where near ??

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