Mechanical Behavior Terminology

1
Mechanical Behavior Terminology

• Force-Deflection
• Stress
• Strain
• Modulus
• Testing Mode
• Shear
• Tensile
• Bending

2
Beginning Concepts

• The simplest tensile test
• Gauge Sample length
• Cross-sectional area
• Force-deflection
• Stress-strain
• Initial Slope of stress-strain curve E
• E E(T), E E(T, t) for V-E material

3
Testing the simplest materials

• Homogeneous
• Single directional loading
• 2 independent parameters describe overall
  material behavior
• E
• Poissons ratio, n

4
Plastic Deformation

• At some load, the force-deflection deviates from
  the linear stress-strain diagram
• Yielding
• Plastic Deformation
• DAMAGE from a structural point of view

5
Plastic Deformation

• Yield Stress
• Yield Strain
• Tensile Failure Stress (strength)
• Tensile Failure Strain (ductility)
• Other modes in bending, shear