Mm 319 tensile test

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Mm 319 tensile test

  1. 1. MECHANICAL BEHAVIOR OF MATERIALS TENSILE TEST Lectures 2 and 3
  2. 2. Deformation of Material Components under load during service - static and dynamic loads P, weight of Fan A A A A P P A A
  3. 3. A P   σ = lim0A A dA P  2 4P P A d σ = The stress, σ, at any point O on the section AA within the cylindrical body is defined by considering a small area, ΔA, around the point O on plane AA and finding the resultant of the distributed force, ΔP, acting in that area ΔA. The stress, σ, at point O on plane AA is given by,
  4. 4. http://www.directindustry.com/prod/in stron/tensile-compression-testing- machine-18463-41713.html
  5. 5. Load- Extension Behaviour Ideal Brittle Material Ductile Material Standard Specimen Necking Gage length and cross section of the specimen is specified in the standards like IS, ASTM, DIN, BS etc. The Test is often carried out by moving the cross head with a certain velocity or imposing a certain strain rate
  6. 6. Deformation of a metal Stress-strain curve for brass I II III
  7. 7. Elastic deformation Change in modulus of elasticity with temperature Elastic and shear moduli, and Poisson’s ratio at room temperature
  8. 8. NPCIL, 26/9/2008 Tensile Stress-Strain curve
  9. 9. Engineering Vs. True Stress-Strain Curves Stress Strain True Stress - Strain Curve Engineering Stress - Strain Curve Ultimate Tensile Strength Fracture Fracture
  10. 10. Toughness and Resilience Area under engineering stress- strain curves corresponding to resilience ur and tensile toughness uf.

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