Types of failure

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short detailing of mechanical failures

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Types of failure

  1. 1. Types of Failure By: Parth Gajjar (116170319007) Submitted To: Prof. G.R.KHUNT
  2. 2. Types of failures  Yielding  Fracture  Elastic deformation  Wear  Buconcentratoin  ckling  Corrosion  Fatigue  Caustic embrittlement  Stress
  3. 3.  Yielding  A yield strength or yield point of a matrial is defined in engineering and materials science as the stress at which a material begins to deform plastically. Prior to the yield point the material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation reversible. will be permanent and non-
  4. 4.  Fracture Under tensile stress plastic deformation is characterized by a strain hardening region and a necking region and finally, fracture (also called rupture).
  5. 5.  Elastic deformation  This type of deformation is reversible. Once the forces are no longer applied, the object returns to its original shape. Elastomers and memory metals such as Intimal exhibit large elastic deformation ranges, as does rubber. However elasticity is nonlinear in these materials. Normal metals, ceramics and most crystals show linear elasticity and a smaller elastic range.
  6. 6.  Wear  In materials science wear is erosion or sideways displacement of material from its "derivative" and original position on a solid surface performed by the action of another surface.
  7. 7.  TYPES OF WEAR  Adhesive wear  Abrasive wear  Surface fatigue  Fretting wear  Erosive wear
  8. 8.  Buckling:  In practice, buckling is characterized by a sudden failure of a structural member subjected to high compressive stress where the actual compressive stress at the point of failure is less than the ultimate compressive stresses that the material is capable of withstanding. For example, during earthquakes, reinforced concrete members may experience lateral deformation of the longitudinal reinforcing bars. This mode of failure is also described as failure due to elastic instability. As shown in fig. A column under a concentric axial load exhibiting the characteristic deformation of buckling.
  9. 9.  Corrosion  Corrosion is the gradual destruction of materials, (usually metals), by chemical reaction with its environment.
  10. 10.  Fatigue  In materials science, fatigue is the progressive and localized structural damage that occurs when a material is subjected to cyclic loading. The nominal maximum stress values are less than the ultimate tensile stress limit, and may be below the yield stress limit of the material.
  11. 11.  Caustic ambrittlement  Caustic embrittlement is the phenomenon in which the material of a boiler becomes brittle due to the accumulation of caustic substances.
  12. 12.  Stress concentration  This discrepancy is explained by the presence of very small, microscopic flaws or cracks that are inherent to the material.
  13. 13. THANK YOU

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