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Franco Bontempi*
Francesco Petrini** – Giulio Biscarini**
Fatigue induced failures in sailing boats:
structural engineering & forensic engineering
*Professore Ordinariodi Tecnica delle Costruzioni
Facoltà di Ingegneria Civile e Industriale
UNIVERSITA' DEGLI STUDI DI ROMA LA SAPIENZA
Via Eudossiana 18 - 00184 Roma - ITALIA
** StroNGER s.r.l. spin-off di ricerca
www.stronger2012.com
https://www.youtube.com/watch?v=8Yau9A7XDHs
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Ottimizzazione Strutturale
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• Forensic Engineering is the
investigation of materials, products,
structures or components that fail or
do not operate or function as
intended, causing personal injury or
damage to property.
Forensic Engineering (1)
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Ottimizzazione Strutturale
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• Generally, the purpose of a forensic
engineering investigation is to locate
cause or causes of failure with a view
to improve performance or life of a
component, or to assist a court in
determining the facts of an accident.
Forensic Engineering (2)
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COSE – STRUTTURE - SISTEMI
THINGS – STRUCTURES - SYSTEMS
PERSONE – COMPORTAMENTI
PEOPLE – HUMAN BEHAVIOR
COSA
WHAT
CHI
WHO
ROTTURA – COLLASSO - CRISI
FAILURE – COLLPASE - CRISIS
PERCHE’
WHY
SPIEGAZIONE – CAUSE
REASON - DISCLOSURE
CO
NO
SC
EN
ZA
KO
NW
LE
DG
E
HAZARD
IN-D
EPTH
DEFE
NCE
HOLES DUE TO
ACTIVE ERRORS
HOLES DUE TO
HIDDEN ERRORS
Failure logic (Reason’s Model)
franco bontempi 25
Conceptual
Design
Detailed
Design
Construction
Use
1
«He used to build cars so they needed a
complete rebuild after every race, but that
was precisely the idea. He'd say they only
need to do 250 miles so if they break down
after 260 then we're doing it about right. Of
course what happened was they very often
broke at about 240...»
Peter Warr former Lotus Team Manager
(Planned) Obsolescence
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Dislocante vs. Planante
Sandbagger
Capsizing test (Global Stability)
4
Local Strength (Local Level)
Structural Robustness• Capacity of a structure to show regular
decrease of its structural quality due to negative causes (damages, errors, …).
• It implies:
a) some smoothness of the decrease
of structural performance due to negative events (intensive feature);
a) some limited spatial spread
of the rupture (extensive feature).
• It help to assure the survivability of the structure under extreme scenarios.
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4.17 %
FIR
ST
& L
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47
48
