3501-13 - Stress-Strain Diagram stress = Force Area strain...

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Stress-Strain Diagram σ , stress = Force / Area ε , strain = Deformation / Length E , Modulus of elasticity = ∆σ / ∆ε Stress-Strain Diagram with well-defined Yield Points (e.g. Mild Steel) Stress-Strain diagram with no defined Yield Points 0.1 % = .001
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Johnson's Apparent Elastic Limit - Point at which the rate of change of strain is 50 % greater than the initial rate of change of strain. Some commonly used terms : Modulus of rupture - Maximum stress before failure in a flexural or torsional member. σ = M c / I flexural member τ = T c / J torsional member Modulus of resilience - Amount of strain energy per unit volume stored in a material when loaded to the elastic limit. It is the area under the elastic portion of the stress- strain curve. Modulus of resilience = ________________ = ________________ Modulus of toughness - Strain energy per unit volume required to cause rupture. It is the area under stress-strain diagram to rupture.
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MECHANICAL TESTS (1) COMPRESSION TEST A specimen is subjected to a gradually increasing uniaxial compressive load until failure occurs.
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