Answer the following questions using the data from the Charpy impact diagram bel

Question

Answer the following questions using the data from the Charpy impact diagram below

69) Which material would be more ductile at -150 °C than at room temperature?

.

70) What is the glass transition temperature (Brittle to Ductile transition onset) for Nylon?

.

71) Which material would be equally ductile over the entire -150 to 100 °C temperature range?

.

72) Which is the most ductile polymer on the list?

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73) What is the Ductile to Brittle Transition Temperature (onset) for mild steel?

a) -80 °C

b) -50 °C

c) 50 °C

d) there is no DBTT with mild steel

Please answer all of them without guessing!!! Thanks

Explanation / Answer

Impact energy is the measure of work done to fracture a material . Higher impact energy means more work is required to fracture ( i.e material can absorb more energy without breaking) this absorbed energy changes the shape of the material and the material is called ductile . whereas if impact energy is low, less work is required to get it fractured( i.e the material can not stand the energy and breaks) such materials are called brittle .

69). Only for aluminium impact energy is greater at --150 ' C than at room temp. So only aluminium will be more ductile at --150 ' C than at room temp.

70). Glass transition temp. For nylon is approx. 50 ' C as at this temp. Impact energy of nylon is starting to increase .( nylon is going from being brittle to ductile)

71). The material having same impact energy throughout the temp. Range would be equally ductile . In the graph copper and acrylic are showing this behaviour but acrylic is brittle . So copper is the material having same ductility over the temp. Range.

72). There are only two polymers in the graph nylon and acrylic . nylon has more impact energy than acrylic after a certain temp. So nylon is more ductile.

73). Ductile to brittle transition temp. Is the temp. When material changes from being ductile to brittle . The impact energy of the material decreases sharply at this temp. .Out of the given options this is happening at -- 50' C so ductile to brittle transition temp. For mild steel is -- 50' C

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