A presentation on "Axial Stress" by Mushfiqul Arefin Khan Nafi

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A presentation on "Axial Stress" by Mushfiqul Arefin Khan Nafi

  1. 1. DEPT. OF CIVIL ENGINEERING PRESTRESS CONCRETE DESIGN SESSIONAL (CE-416) MUSHFIQUL AREFIN KHAN(NAFI) 10.01.03.138
  2. 2. NAME OF MY TOPIC : “AXIAL STRESS”
  3. 3. STRESS(In Mechanics):  The term stress is used to express the loading in terms of force applied to a certain crosssectional area of an object.  From the perspective of loading, stress is the applied force or system of forces that tends to deform a body.  From the perspective of what is happening within a material, stress is the internal distribution of forces within a body that balance and react to the loads applied to it.
  4. 4.  The stress distribution may or may not be uniform, depending on the nature of the loading condition.  Simplifying assumptions are often used to represent stress as a vector quantity for many engineering calculations and for material property determination. The word “vector” typically refers to a quantity that has a "magnitude" and a "direction".  Simple Stresses are mainly of 4 types: 1.Axial or Normal Stress 2. Shear Stress 3.Bearing Stress 4.Thin-walled Pressure Vessel
  5. 5. Axial Stress :  Axial or normal stress is defined as the stress component at a point in a structure which is perpendicular to the reference plane.  Axial loads pass through the centroid of the section and must be perpendicular to the reference plane.  The axial forces upon the structure are typically stretching force or compression force, depending on direction.
  6. 6.  when the bar is stretched, the resulting stress are tensile stress, if the bar is compressed, the stress are compressive stress.  the stress σ (sigma) acts in the direction perpendicular to the cut surface, that is referred as normal stress or Axial stress.  sign convention of the normal stresses are : tensile stress as positive and compressive stress as negative.  Unit of stress : *SI unit : N / m2 (Pa, Pascal), N / mm2 (MPa)
  7. 7. Types of Axial stress : 1. Tensile stress : It is customary to refer to axial stress that cause traction or tension or extends on the surface of a cut known as Tensile stress. Example : tension cables on a bridge.
  8. 8.  2. Compressive stress : Axial stresses those are pushing against the cut are known as Compressive stress. Example : columns in architecture and the steel structure of high rise building.
  9. 9. Assumptions : Members should be straight.  Axial force P must act through the centroid of the cross-section and must be perpendicular reference to the plane. Otherwise, the bar will bend and a more complicated analysis is needed.  The stress must be uniformly distributed over the cross-section.
  10. 10.  Material should be homogeneous (same throughout all parts of the bar).  Deformation is uniform. That is, we assume that we can choose any part of the bar to calculate the strain.

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