Hank, you didn't address the pipe vs tubing issue. Is pipe with a seam
inherently much weaker than seamless tubing of the same material and
wall thickness?
73, Pete N4ZR
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On 11/2/2009 8:34 PM, Hank Lonberg wrote:
> Dave:
>
> The important number is the yield stress not the tensile
> stress. 6061-T6 and the stainless, most likely 304 or even
> 316, have about the same yield of 36,000 psi plus or minus.
> This is the threshold stress where the behavior of the
> material changes from elastic to plastic. This mean if want
> the material to rebound to initial position after loading you
> need to keep the max stress below yield. In the case of your
> masting material they will both support about the same load
> with equal stresses.
>
> The kicker is the Modulus of Elasticity,E, which for the
> stainless, like other steels, is around 29,000,000 psi. The E
> for aluminum is around 10,000,000 psi. This means for the same
> section dimensions and load the aluminum will deflect 3 time
> more than the steel. My money for durability is on the
> stainless.
>
> Regards
> Lonberg Design Group, Ltd.
> H.S. Lonberg, P.E.,S.E.
> President
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Pete
> Smith
> Sent: Monday, November 02, 2009 1:30 PM
> Cc: 'David Jordan'; TowerTalk@contesting.com
> Subject: Re: [TowerTalk] Stainless Steel Mast
>
> BUT, if it's pipe, it may not be seamless
>
> 73, Pete N4ZR
> New Articles Daily - the Contesting Compendium at
> http://wiki.contesting.com
> The World Contest Station Database, updated daily at
> www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net
>
>
> On 11/2/2009 3:34 PM, Rex Lint wrote:
>
>> Dave,
>>
>> 6061-T6 has Tensile strength of 42K PSI and yeild at 35K PSI
>>
> - See
>
>> wikipedia.
>> Stainless varies from about 75K to 190K PSI Tensile,
>>
> depending on the
>
>> allooy. See http://www.onlinemetals.com/stainlessguide.cfm
>>
>> -Rex-
>>
>> K1HI
>> Rex Lint
>> Merrimack, NH
>>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of David
>>
> Jordan
>
>> Sent: Monday, November 02, 2009 2:10 PM
>> To: TowerTalk@contesting.com
>> Subject: [TowerTalk] Stainless Steel Mast
>>
>> Hi Folks,
>>
>>
>>
>> I found a nice length of stainless steel pipe 2" OD (.250"
>>
> wall) by 10ft
>
>> that I thought might make a nice mast stub. How would this
>>
> tubing's
>
>> strength compare to 6061 aluminum of similar dimensions?
>>
>>
>>
>> Thanks,
>>
>> Dave
>>
>> Wa3gin
>>
>>
>>
>>
>>
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