Page 65 - Ship Construction.DJ Eyres 6Ed

Ch06-H8070.fm Page 54 Wednesday, October 18, 2006 8:03 AM
54 Ship Construction
hardened so that it cannot be driven home. Where rivets are driven hot the
temperature must be carefully controlled to avoid metallurgical damage. The
shear strength of hot driven rivets is slightly less than that of cold driven
rivets.

Aluminium Alloy Sandwich Panels
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As with steel construction proprietary aluminium alloy honeycomb sandwich
panels are now available to replace fabricated plate and stiffener structures
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
and can offer extremely low weight options for the superstructures of high
speed craft.

Fire Protection

It was considered necessary to mention when discussing aluminium alloys
that fire protection is more critical in ships in which this material is used
because of the low melting point of aluminium alloys. During a fire the
temperatures reached may be sufficient to cause a collapse of the structure
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unless protection is provided. The insulation on the main bulkheads in
passenger ships will have to be sufficient to make the aluminium bulkhead
equivalent to a steel bulkhead for fire purposes.
For the same reason it is general practice to fit steel machinery casings
through an aluminium superstructure on cargo ships.

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