MEX-020 · Friction, elasticity and deformation Sample material

Mechanical properties of solids

Crystalline and amorphous solids, the stress–strain diagram: proportional, elastic, yield and ultimate strength limits; ductile and brittle materials, hardness, safety factor and bending deformation.

Estimated time: 2 h 50 min 4 activities

Learning objective

Know the quantities that characterise the mechanical properties of solids.
Read a stress–strain diagram and explain its characteristic points.
Distinguish ductile and brittle materials and calculate the safety factor.
Study bending deformation and how Young's modulus is determined from it.

Expected outcomes

Calculates the allowable load and required cross-section from the ultimate strength and the safety factor.
Determines Young's modulus and the yield and ultimate strengths from a stress–strain diagram.
Relates the deflection of a beam to its dimensions and Young's modulus.

Interactive modelStress–strain diagram

Activities

Lecture
Lecture · 1 h 15 min · required
Problem solving: mechanical properties of solids
Practice · 1 h 15 min · required
Determining the modulus of elasticity (Young's modulus) from bending deformation
Laboratory · 2 h 30 min · optional
Final test
Test · 20 min · required · pass ≥ 70%

Completion conditions

  • Lecture
  • Problem solving: mechanical properties of solids
  • Final test — at least 70%