Understanding Stress and Strain in Materials - A Comprehensive Overview
Learn about stress, strain, Poisson's ratio, Hooke's Law, tensile tests, viscoelasticity, and more. Explore different deformation types and material behavior in this informative guide.
Understanding Stress and Strain in Materials - A Comprehensive Overview
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Presentation Transcript
2. Stress Intensity of Force
Stress = ____ /____
3. Types of Stress Normal : load perpendicular to area
7. Types of Strain Normal : deformation in the the direction of length
8. Transverse Strain Materials tend to expand/contract in the directions perpendicular to the load application.
Poissons Ratio
? = - _____________ axial strain
9. Why Poissons Ratio ?
13. Relating Stress and Strain Called a Constitutive Model
Simple Linear Model:
Hookes Law
17. Real Material Behavior -Hookean to a limiting strain
-Proportional limit : Deviation from linear
-After PL
*Linear
*Flat
*Non linear
18. Tensile Test
21. Slope of Recovery Line
22. Unload/Reload
23. Yield Strength from S-e Curve
24. Everything Together
25. What is Viscoelastic Deformation?
26. Creep Test Viscoelasticity
27. Deformation Types
Name Math Model Time Dependency Type
Elastic Linear/Nonlinear None Recoverable
Plastic Linear/Nonlinear None Nonrecoverable
Viscoelastic Linear/Nonlinear Strong Recoverable
Viscoplastic Nonlinear Strong Nonrecoverable
28. Representative Modulii