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View Full Version : Interesting thread on T-F... XTP/Hi-Fi head tube FEA

thetart20
03-31-2005, 04:14 PM
FROM CHINA FORUM


ECHO ：
http://www.panpa.com/test/ECHO-HIFI-BACKWARD-1.wmv
http://www.panpa.com/test/ECHO-HIFI-BACKWARD-2.wmv
http://www.panpa.com/test/ECHO-HIFI-BACKWARD-3.wmv
http://www.panpa.com/test/ECHO-HIFI-BACKWARD-4.wmv
http://www.panpa.com/test/ECHO-HIFI-TEST-BACKWARD-1.jpg
http://www.panpa.com/test/ECHO-HIFI-TEST-BACKWARD-2.jpg
http://www.panpa.com/test/ECHO-HIFI-TEST-BACKWARD-3.jpg
http://www.panpa.com/test/ECHO-HIFI-FORWARD-1.wmv
http://www.panpa.com/test/ECHO-HIFI-FORWARD-2.wmv
http://www.panpa.com/test/ECHO-HIFI-FORWARD-3.wmv
http://www.panpa.com/test/ECHO-HIFI-FORWARD-4.wmv
http://www.panpa.com/test/ECHO-HIFI-TEST-FORWARD-1.jpg

KOXX：
http://www.panpa.com/test/KOXX-XTP-TEST-BACKWARD-1.wmv
http://www.panpa.com/test/KOXX-XTP-TEST-BACKWARD-2.wmv
http://www.panpa.com/test/KOXX-XTP-TEST-BACKWARD-3.wmv
http://www.panpa.com/test/KOXX-XTP-BACKWARD-1.jpg
http://www.panpa.com/test/KOXX-XTP-BACKWARD-2.jpg
http://www.panpa.com/test/KOXX-XTP-TEST-FORWARD-1.wmv
http://www.panpa.com/test/KOXX-XTP-TEST-FORWARD-2.wmv
http://www.panpa.com/test/KOXX-XTP-TEST-FORWARD-3.wmv
http://www.panpa.com/test/KOXX-XTP-FORWARD-1.jpg
http://www.panpa.com/test/KOXX-XTP-FORWARD-2.jpg

I assume the same loading conditions...
fjas
03-31-2005, 04:25 PM
Here are the pictures, i guess we have to assume same load. Otherwise it is pretty useless.
http://www.observedtrials.net/otn2/ECHO-HIFI-TEST-BACKWARD-1.jpg

http://www.observedtrials.net/otn2/ECHO-HIFI-TEST-BACKWARD-2.jpg

http://www.observedtrials.net/otn2/ECHO-HIFI-TEST-BACKWARD-3.jpg

http://www.observedtrials.net/otn2/ECHO-HIFI-TEST-FORWARD-1.jpg

http://www.observedtrials.net/otn2/KOXX-XTP-BACKWARD-1.jpg

http://www.observedtrials.net/otn2/KOXX-XTP-BACKWARD-2.jpg

http://www.observedtrials.net/otn2/KOXX-XTP-FORWARD-1.jpg

http://www.observedtrials.net/otn2/KOXX-XTP-FORWARD-2.jpg
afrobot
03-31-2005, 04:30 PM
Communist propaganda!
mads_junior2
03-31-2005, 04:43 PM
Wow, mint done..! ..by some japanese who want to show that the the new echo is more stiff than the XTP?

I think both of those break the fork, before frame........
fjas
03-31-2005, 04:55 PM
Wow, mint done..! ..by some japanese who want to show that the the new echo is more stiff than the XTP?

Ummm....no? Guess again.
airfruit
03-31-2005, 05:02 PM
hahhaha, that's cool! the analysis on frame stress concentrations. they are not showing that new echo is stiffer than the XTP, they are showing that xtp has some high stress concentration areas due to the head tube design. so if they were to load the frame both in the same bending situation, the koxx would fail at the red place first. Therefore, they are trying to show the echo is a lot more well designed than the koxx, haha. yeah fork should fail first.
Elan
03-31-2005, 05:15 PM
#1, who conducted this test? echo? yeah, right.
#2, i saw ~1,000,000 xtps in france, none of them were broken.
#3 how much was the load?
#4, worry about your fork more than anything
#5, people are boreder than me?
fjas
03-31-2005, 05:42 PM
#5, people are boreder than me?

You have 5,633 posts.
:nuts:
rush
03-31-2005, 05:48 PM
#7 profit?


I think its a great thing to put out if its done by an impartial party.
Ross W.
03-31-2005, 06:47 PM
yeah, certainly interesting. I'd still go Koxx over Echo though.
hello?
03-31-2005, 07:35 PM
yeah those koxx frames have been tested and they havent broken....still need to see how these new echos do.
Ross W.
03-31-2005, 07:46 PM
agreed.
rtorrenga
03-31-2005, 09:35 PM
Honestly, this test shows that both frames would fail with this type of loading. I am not sure how significantly different the numbers would be for a U6 aluminum alloy, but the Yield Strength of both 6061-T6 and 7005-T6 are around 276 MPA (2.76 x 10^8 N/m^2) and 290 MPA (2.90 x 10^8 N/M^2). Both of these models show stresses greater than 6.3 x 10^8 N/m^2.

I know that this is a lot of stupid numbers. All that I am trying to say is that unless you know what the load is and how it is applied the FEA shows that both frames fail.

(unless if f***ed up the #'s, the i should just go crawl under a rock for a while)
Ross W.
03-31-2005, 10:21 PM
do that anyway, just for using those numbers.