Re: Interesting visitor....

On Thu, 4 Dec 2008 12:07:32 -0500, "Eisboch" <rce@xxxxxxxxxxx> wrote:


"Richard Casady" <richardcasady@xxxxxxxxxxxxx> wrote in message
news:4946069e.157396109@xxxxxxxxxxxxxxxxxxxxxxxxxx
On Wed, 3 Dec 2008 11:28:46 -0800, "Calif Bill"
<bmckeespam@xxxxxxxxxxxxx> wrote:

The problem with lots of the aluminum ship structures was bad design.
Lots
of cracks happening. So better designers were needed. Harry maybe?

Actually, since aluminum and steel have the same strength to weight
ratio, it would seem that someone heard rumors that aluminum is
lighter, and designed it that way. Lighter is weaker. Duh.

Good grief.

Use steel in the places you need strength.
Use aluminum in the places you need light weight.
Use titanium when you need both.

I'm not an expert on steel or aluminum, but a few years ago I had to
do some research on this very subject.

As I understand it, and again this is remembering what I learned at
the time, the major difference between steel and aluminum is that
aluminum will reach it's failure point, given the same strength
standard, 40% sooner than steel.

Again, that's how I remember the issue.

I could be entirely wrong.
.

Relevant Pages

  • Re: Carbon fiber wrenches?
    ... of steel's strength is needed in places like bike frames: ... Sufficient volumes of aluminum to make a bike frame have fewer such ... Weight for weight aluminums and steels are pretty close in tensile ... strength. ...
    (rec.bicycles.tech)
  • Re: Comparison of Auminium, Steel and Carbon forks?
    ... right for both yield strength and fatigue life for a particular ... Generally, to get comparable fatigue life, the ... aluminum will use a bit more material than needed for comparable ... limit for steel tubing diameter is dent/crumple resistance. ...
    (rec.bicycles.tech)
  • Re: why no more steel bikes?
    ... Steel gets a bad rap of being 'heavy' and some will go so far as claim it gets soft over time. ... Steel has one significant disadvantage compared to aluminum, when made light and stiff it gets the same caracteristic as a beercan. ... continuous research work has meant that the weight of the rounded metal container has become lower and lower. ... Sure "jim", whatever you say, you abusive jerk. ...
    (rec.bicycles.tech)
  • Re: why no more steel bikes?
    ... Steel gets a bad rap of being 'heavy' and some will go so far as claim it gets soft over time. ... Steel has one significant disadvantage compared to aluminum, when made light and stiff it gets the same caracteristic as a beercan. ... continuous research work has meant that the weight of the rounded metal container has become lower and lower. ... Sure "jim", whatever you say, you abusive jerk. ...
    (rec.bicycles.tech)
  • Re: why no more steel bikes?
    ... Steel gets a bad rap of being 'heavy' and some will go so far as claim it gets soft over time. ... Steel has one significant disadvantage compared to aluminum, when made light and stiff it gets the same caracteristic as a beercan. ... Did you ever compare the anti-crushability stiffness of a steel beverage can with an aluminum one of the same diameter? ... continuous research work has meant that the weight of the rounded metal container has become lower and lower. ...
    (rec.bicycles.tech)
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