Which metal would flex more?

[PaisleyPCdoctor]

I was kinda hoping not to spend £250K+ on a test rig to find out. Lol

Just looking for advice for people that work with metals what they thought.

[Zeeflyboy]

Would depend on the aluminium alloy to some extent but Youngs modulus of steel is roughly 3x that of Aluminium.

There is not really a particularly significant difference in modulus between stainless/mild.

Flexural modulus is usually fairly in line with Youngs modulus in metals. Polymers can vary more.

https://www.engineeringtoolbox.com/y...lus-d_773.html

Edit - as it pertains to machine design, the general rule of thumb I've seen bandied around is that you need twice the thickness of aluminium to achieve similar stiffness to steel. No idea where that rule of thumb started though nor how accurate it is when considering all the different variables in real applications.

[magicniner]

I was kinda hoping not to spend £250K+ on a test rig to find out. Lol

Just looking for advice for people that work with metals what they thought.

And in giving dimensions and materials you are asking them to perform standard calculations based on set formulae which are easily found.
It isn't Rocket Science and if yo want to pay my hourly rate I will look up the equations and do the calculations for you.

Around 8 years ago I wanted to know about material thicknesses in cylinders for a variety of diameters and pressures and looked up the required mechanical engineering equations, if you were to ask this on a mechanical engineering forum I'd expect an "off the cuff" answer but generally speaking by asking this here you are just expecting someone else to do your work for you, and someone might, but without seeing their working how will you know if the answer is any good?

[Zeeflyboy]

Just out of interest, took your dimensions and applied a load of 200N to mild steel and 6061 alu:








10mm Steel deflection = 0.06861 mm

25mm Alu deflection = 0.01471 mm


So according to that simulation, the 25mm alu would deflect less.

[PaisleyPCdoctor]

Just out of interest, took your dimensions and applied a load of 200N to mild steel and 6061 alu:








10mm Steel deflection = 0.06861 mm

25mm Alu deflection = 0.01471 mm


So according to that simulation, the 25mm alu would deflect less.

That is amazing! Totally opposite from what I thoughtModulus of Elasticity. I have the 25mm aluminium, but thought I'd be better buying steel. Excellent news. Thanks for you efforts- totally appreciated.

[magicniner]

Good man!
Someone else was willing to do the basic maths for you!
You should do a degree course now! :D

[PaisleyPCdoctor]

And in giving dimensions and materials you are asking them to perform standard calculations based on set formulae which are easily found.
It isn't Rocket Science and if yo want to pay my hourly rate I will look up the equations and do the calculations for you.

Around 8 years ago I wanted to know about material thicknesses in cylinders for a variety of diameters and pressures and looked up the required mechanical engineering equations, if you were to ask this on a mechanical engineering forum I'd expect an "off the cuff" answer but generally speaking by asking this here you are just expecting someone else to do your work for you, and someone might, but without seeing their working how will you know if the answer is any good?

Do you actually help anyone on this forum or just troll members with snipes, criticisms and general vinegar titted grumpiness?
#boring

[magicniner]

Yes,
I'm glad you ask, actually I answer lots of direct relevant questions with well thought out technical answers from people who aren't lazy clueless wakners who can't be bothered to carry out a basic Google search to see if there is a good answer just sitting there for them on the net.
But I guess you are too lazy to search and discover that too!
#SLACKER!
;-)

[PaisleyPCdoctor]

Yes,
I'm glad you ask, actually I answer lots of direct relevant questions with well thought out technical answers from people who aren't lazy clueless wakners who can't be bothered to carry out a basic Google search to see if there is a good answer just sitting there for them on the net.
But I guess you are too lazy to search and discover that too!
#SLACKER!
;-)

What you mean is that you didn't have a clue what the answer is so you snipe instead. Lol. Go troll someone else. For the record, any question I ask on this forum is directed SPECIFICALLY NOT at you, so please ignore it. I am directing it at technically knowledgeable people who may or may not choose to help. Goodbye.

[magicniner]

����What you mean is that you didn't have a clue what the answer is so you snipe instead. Lol. Go troll someone else. ������ For the record, any question I ask on this forum is directed SPECIFICALLY NOT at you, so please ignore it. I am directing it at technically knowledgeable people who may or may not choose to help. Goodbye.

No,
I mean you come across as someone who can't be bothered to do even basic research for yourself, even though very good answers are available to a fairly basic Google search which could be expected of any "PC Doctor".

For the record you can use your preferences to ignore my responses, making a bit of an effort would have the same effect ;-)

P.S. use of multiple question marks is not a good personality stability sign :D