Question

lack of toughness in material is usually reffered to as

Answer 1

brittleness plasticity ductility softening

Answer 2

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Brittleness identifies material easily broken, damaged, disrupted, cracked, and/or snapped. Brittle materials exhibit tensile S-S behaviors different from the usual S-S curves. ... Specimens of such materials fracture without appreciable material yielding. They lack toughness.