[TowerTalk] mixing EHS and Phillystran

[Bill Aycock]

I have a serious question for the professionals out there. (I am not a PE,
nor do I have lots of Galvanized in the air, but I am an Engineer)

The question, or doubt, really, is in the effectiveness of mixing
Phillystran with EHS. It is not a question of strength, but of the
difference in the stretch properties of the two.  I do not have the
figures, but I remember some comments from earlier postings that indicate
that the Phillystran, at comperable strength, has much more stretch than EHS.

The effect of this will be to make the Phillystran almost ineffective when
under added load with the EHS, where a similar set-up with Phillystran
alone would be great.

If you want to make a simple experiment,  parallel a string and a strong
rubber band- as you pull the pair, the load is almost all taken by the
string, until it breaks.

Bill


Bill Aycock   W4BSG
Jackson County, AL
EM64vr
W4BSG is "vanity" this time, but was 
earned by exam in 1954, the first time.

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