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Mechanical Properties. MFG 355. Forces and Responses. Tensile – applied loads “pull” the sample. Tensile Forces. Gripping Zone. Gripping Zone. Failure Zone. ¾ inch. ½ inch. 8 ½ inches. Forces and Responses. Compression – applied loads “squeeze” the sample. Forces and Responses.

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Presentation Transcript
forces and responses
Forces and Responses
  • Tensile – applied loads “pull” the sample
tensile forces
Tensile Forces

Gripping Zone

Gripping Zone

Failure Zone

¾ inch

½ inch

8 ½ inches

forces and responses4
Forces and Responses
  • Compression – applied loads “squeeze” the sample
forces and responses5
Forces and Responses
  • Flexural – applied loads “bend” the sample
forces and responses6
Forces and Responses
  • Shear – applied loads are offset
forces and responses7
Forces and Responses
  • Torsion – applied loads “twist” the sample
mechanical behavior
Mechanical Behavior
  • Impact (toughness) – applied loads “hit” the sample
  • Impact (charpy, dart)
elastic solid
Elastic Solid
  • Stress-strain
  • What happens when force is removed?
    • Recovery
viscous liquid

F/A = ŋ dv/dx = ŋγ

Shear Thickening

Shear Thinning

Newtonian

Viscous liquid
  • Tensile forces? – cannot exist (like pulling water)
  • Shear forces
  • What happens when force stops?
    • Viscous flow
  • Newtonian and non-Newtonian
measures of viscosity
Measures of Viscosity
  • Equation

F/A = τ = ŋ (dv/dx)

  • Viscometer
viscoelasticity
Viscoelasticity
  • Time/temperature dependant
  • Plastic stress-strain
    • a) start point
    • b) proportional limit
    • c) yield
    • d) recovery
    • e) ultimate failure
mechanical model of plastic behavior

Dashpot

Permanent Deformation (sandpaper)

Spring

Mechanical Model of Plastic Behavior
time dependence of plastics
Time Dependence of Plastics

Increasing shear rate

Stress

Strain

reinforcements
Reinforcements
  • Increase mechanical properties
  • Generally fibers
  • Composites
fillers
Fillers
  • Reduce cost
  • Can potentially decrease mechanical properties
  • Can improve
    • UV stability
    • Thermal stability
    • Wear resistance
    • Electrical conductivity
    • Flame resistance
    • CTE
toughness modifiers
Toughness Modifiers
  • Increase impact strength
  • Increases the potential for movement within the plastic on impact (creep)
  • Example – ABS