Rheology

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Rheology

• ?? 341 ???????????????????????????????????

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Quiz
?????????????????? 1. Bioyield ????????????? ?
2. Modulus of Elasticity ????????????
Stress (MPa)
Strain ()
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Basic concept Definition

• Rheology ????????????????????????????
  (Deformation) ????????? (Flow) ???????
• ????????? Mechanical properties ????????????
  Deformation ???? ?????????????????? Rheological
  properties
• Rheology ?????? Parameter ???? ? ????? force,
  deformation, and time
• ?????????????????????? Rheology ??????
  Time-dependent stress and strain behavior, Creep,
  Stress relaxation and Viscosity

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Basic concept Definition
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Basic concept Definition
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ASTM definition

• Strain
• Linear (tensile or compression) strain
• Axial strain
• Transverse strain
• Shear Strain
• True strain ln(dL/L0)
• Macro/Micro-strain

• Stress
• Nominal Stress
• Normal stress
• Tensile stress
• Compressive stress
• Shear stress
• Torsional Stress
• True stress
• Fracture stress

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ASTM definition

• Rigidity (shear modulus)
• Isotropic
• Homogeneous
• Stress relaxation
• Creep
• Viscosity
• Kinematic viscosity

• Newtonian liquid
• Non-Newtonian liquid
• Apparent viscosity
• Thixotropic fluids
• Rheopectic fluids

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ASTM definition
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Stress-strain curve for a 15.2 mm long by 10.0 mm
diameter sample of Red Delicious apple loaded at
a strain rate of 82/s
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ASTM definition

• Compressive strength
• Elastic Limit
• Modulus of elasticity
• Initial tangent modulus
• Tangent modulus
• Secant modulus
• Chord Modulus
• Poissons ratio
• Proportional limit
• Shear strength
• Tensile strength
• Yield point

• Yield strength
• Pressure
• Deformation
• Bioyield point
• Rupture point
• Bioyield strength
• Stiffness
• Elasticity
• Plasticity
• Toughness
• Mechanical hysterisis

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