Under which of the following condition an element subjected to stresses is said to be in a state of triaxial stress? 

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SSC JE Civil 06 Jun 2024 Shift 1 Official Paper - 1
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  1. When the shear stresses acting along three mutually perpendicular directions of the element
  2. When the normal stress along two mutually perpendicular direction and shear stress along third direction
  3. When the principal stresses acting along three mutually perpendicular directions
  4. When the stress acting along only one axis of the element

Answer (Detailed Solution Below)

Option 3 : When the principal stresses acting along three mutually perpendicular directions
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Detailed Solution

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Stress States in Materials:

  1. Uniaxial Stress:

    • Definition: An element or object subjected to principal stresses in only one direction is said to be under uniaxial stress.
    • (Normal stress is acting only along one axis, typically the x-axis.)
  2. Biaxial Stress:

    • Definition: A two-dimensional state of stress in which two normal stresses are present is called biaxial stress. In other words, if there are three mutually perpendicular principal stresses, two act in the same plane, and one is zero.
    • σx,σy (Normal stresses act along two perpendicular axes, typically the x-axis and y-axis.)
  3. Triaxial Stress:

    • Definition: An element or object subjected to principal stresses in three mutually perpendicular directions is called triaxial stress.
    • (Normal stresses act along all three mutually perpendicular axes, typically the x-axis, y-axis, and z-axis.)
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