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Mechanical Properties of Materials

Dental Materials • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Stress = force/area; strain = ΔL/L.
  • Elastic modulus = stiffness.
  • Resilience = elastic energy; toughness = total energy to fracture.
  • Knoop/Vickers = microhardness; Brinell/Rockwell = macro.
  • Ceramics are brittle (low strain to failure).

Mechanical Properties

  • Stress = force / area; Strain = change in length / original length.
  • Elastic (Young's) modulus = stress / strain in the elastic region → stiffness (higher = stiffer).
  • Resilience = energy absorbed up to the elastic limit (area under the elastic part of the curve).
  • Toughness = total energy to fracture (area under the whole stress–strain curve).
  • Hardness tests: Knoop and Vickers (microhardness), Brinell and Rockwell (macrohardness).

Other Terms

Yield strength, ultimate tensile strength, ductility/malleability, and creep are also tested. Brittle materials (ceramics) have low strain to fracture.

Exam Tips ⭐

Modulus = stiffness; resilience = elastic energy; toughness = total energy to fracture; Knoop/Vickers = microhardness.

📝 Practice MCQs — Mechanical Properties of Materials

Q1. Young's modulus is a measure of:
A. Hardness
B. Stiffness
C. Toughness
D. Ductility
Show Answer
✅ Answer: B
Elastic modulus reflects stiffness (resistance to elastic deformation).
Q2. Total energy absorbed up to fracture is:
A. Resilience
B. Toughness
C. Hardness
D. Yield strength
Show Answer
✅ Answer: B
Toughness is the area under the entire stress–strain curve.
Q3. Which is a microhardness test?
A. Brinell
B. Rockwell
C. Knoop
D. Shore
Show Answer
✅ Answer: C
Knoop (and Vickers) are microhardness tests.
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