Review the Mechanical Properties of Materials

What is the difference between a ductile and a brittle material How will their stress/strain curves differ  

A typical Young s modulus for a perfect crystal lattice should theoretically be about 10 ° Nm however, experimentally values between 10 and 10 Nm are observed. Why do you think this is  

A solid plastic brick with dimensions ax bxcis compressed by a force applied parallel to a, and a volume change is measured. Show that the change in volume under an applied force parallel to a is equal to 

de Gennes, Soft matter birth and growth of concepts. In Twentieth Century Physics, ed. L.M. Brown, A. Pais, and B. Pippard. Boca Raton, FL CRC Press, Chapter 21 (1995), 

Schroder, An Introduction to Thermal Physics. Boston Addison Wesley Longman (2000). 

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