Aluminium Expansion 1

[tomcannon]

Hi, can someone please help me with how to calculate the expansion of aluminium with heat? I know the alloy will probably affect the result, but I'm just after a guide amount at this stage. For reference the piece in question is 65mm deep, and temperature change will be between circa 10degrees C and 100degrees C.

Thanks.

 

[tomcannon]

Thanks desertfox, have printed off your file and will have a good read over it tonight. All interesting stuff for me as I dont get this involved normally!

Regards,
Tom

 

[desertfox]

hi tomcannon

Your welcome, just remember thats just a rough example, it doesn't look at thread engagement etc, also it assumes that the joint as reached equilibrium temperature wise, I would advise you also to see how the yield stress changes with temperature for your materials as you will find it reduces as the temperature increases.

desertfox

 

[rb1957]

a point to consider, talking about preload and thermal stresses, is the scatter in preload. a torque wrench can apply +30% over the nominal torque.

my 2c, i wouldn't react the preload under the washer (area), i'd use the bolt head area ... maybe not much in it.