Pykrete

Power Point Presentation byPower Point Presentation by

Jacob HarrisJacob Harris

Certain materials are included under the fair use exemption of the U.S.

Copyright Law; Materials are included in accordance

with the multimedia fair use guidelines; and

Materials are restricted from further use.

Pykrete iscomposite material made of 14% wood

pulp and ice

Interesting Properties of Pykrete

It has a slow melting rate due to low thermal conductivity

It has an improved strength and toughness over pure ice, it is actually closer to concrete in strength

It is slightly harder to form than concrete, because it expands while freezing

The History of PykreteThe History of PykreteInvented by Max Perutz??

It is named after Geoffrey Pyke. He proposed that the Royal Navy make a huge, unsinkable aircraft carrier using this material during World War II

Durability of PykreteDurability of Pykrete

A ship made of this material would be unsinkable; torpedoes could hit it and do little damage

It has a crush resistance of greater then 3,000 per square inch, so a one-inch column could support the weight of a typical car

The wood pulp in the material makes it extremely stable at high temperatures

If a .303 caliber bullet is fired at the material, it will penetrate only 6.5 inches

Comparison of Ice and Pykrete

Ice-before Ice-after

Pykrete-before Pykrete-after

These photos were taken on July 22, 2000 by J Gordon Holley

Both the pykrete and ice were frozen in 1 gallon milk jugs for one week. The pykrete was 10% sawdust by weight

Both were shot with a .243 rifle at 100 meters. A .243 bullet fired form 300 meters can push a 1 lb object for a distance of 1000 feet

Sources WikipediaWikipedia

http://en.wikipedia.org/wiki/Pykrete.htmhttp://en.wikipedia.org/wiki/Pykrete.htm informationinformation

Nobelprize.orgNobelprize.orghttp://http://nobelprize.org/chemistry/laureates/1962/perutznobelprize.org/chemistry/laureates/1962/perutz--bio.bio.

htmlhtmlImageImage

SWalkSWalkhttp://http://www.www.swalkswalk.com/.com/habhead.htmlhabhead.htmlImageImage

Grippy and CormoGrippy and Cormohttp://www.geocitices.com/Broadway/1928/pykrete.htmhttp://www.geocitices.com/Broadway/1928/pykrete.htmImages and informationImages and information