Ductile to Brittle transition (DBT) - Charpy Impact testing

EGR070:
Technical memo's vs. letters

Charpy Impact Testing:

Charpy impact toughness and Ductile to Brittle Transition (DBT):

• The only test this semester with direct temperature effect on properties - all other labs have used heating/cooling to altered the microstructures (which in turn, affect properties)
• Discuss DBT, etc. – effect of carbon on DBT
• Engineering really DOES matter: Titanic, USS Schenectady, STS Challenger

Titanic Charpy impact data:

USS Schenectady, Portland, Oregon:

The USS Schenectady a new tanker breaks apart, sinks at Swan Island Dock, Portland , Oregon , January 16, 1943. Temperature that day was in the low 40's.

STS Challenger - another DBT example:

(simple experiment by Dr. Richard Feynman, domenstrating DBT after-the-fact).
Challenger Crew Memorial in Arlington National Cemetary

EGR270:
Meet in SH120 - conduct Charpy Impact testing
Watching ice grow during our lab: COOL!

Assignment:
Memoranda (aka "memos") are very similar to technical letters in content; however, the format it somewhat different (see example).