From: Luis Lopez Martinez [Luis.LopezMartinez@umtt.com]
Sent: jeudi, 21. avril 2005 18:30
To: Mario Plasencia (E-mail); Miodrag Prokic (E-mail)
Cc: Members UMTT
Subject: FW: Fatigue test results

Importance: High

Attachments: F3 FAT 71.pdf

Mario

Following up your phone call from today you will find attached our most recent fatigue test results for UP improved welds.

> The treated weld consist of a non-load carrying fillet weld, stress 
> concentration 3.0-3.5 (F2).
> This detail is classified in the IIW Recommendations as FAT 71.
> 
> In other words one stiffener of 150 mm, on each side of a 70 mm wide 
> plate, 12mm thick, see attached picture.
> The load applied was constant amplitude.
> 
> If we assume a stress range of 225 MPa the improvement achieved in 
> life is approx from 70.000 cycles up to 300.000 cycles which is a four 
> times increase in fatigue life.
> For lower stress ranges the increase in fatigue life is even greater.
> 
> It should be noted that the improvement is more accentuate for longer 
> fatigue lives, or high cycle fatigue, showing the clear redistribution 
> of the tensile residual stresses due to the welding procedure itself.
> 
> Please do not hesitate to contact us if you need further information.
> 
> Yours sincerely
>  <<F3 FAT 71.pdf>>
> 
> 
> UMTT S.A.
> Luis Lopez Martinez MSc. Lic. Eng.
> Research & Development Manager
> 
> Lindtsedijk 78, 3336 LE Zwijndrecht
> Postbus 281, 3330 AG Zwijndrecht
> The Netherlands
> 
> Phone: +31 (0) 78 6299751
> Fax: +31 (0) 78 6299724
> Mobile: +31 (0) 651 755781
> 
> www.umtt.nl
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