Ductile Materials:

• Ductile materials will withstand large strains before the specimen ruptures.
• Ductile materials often have relatively small Young’s moduli and ultimate stresses.
• Ductile materials exhibit large strains and yielding before they fail.
• Steel and aluminum usually fall in the class of Ductile Materials

Brittle Materials:

• Brittle materials fracture at much lower strains.

• Brittle materials often have relatively large Young’s moduli and ultimate stresses.

• Brittle materials fail suddenly and without much warning.
• Glass and cast iron fall in the class of  Brittle Materials.

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