Physical reason behind Plane Stress

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SUMMARY

The discussion centers on the concept of plane stress and its dependence on the orientation of the stress axes. It highlights that stress values change when viewed from different angles, specifically referencing the role of Mohr's Circle in visualizing these changes. The inherent material properties and the mechanics of forces acting on materials are crucial to understanding this phenomenon. The example of steel shearing at 45 degrees under tensile stress illustrates the practical implications of these theoretical concepts.

PREREQUISITES
  • Understanding of plane stress theory
  • Familiarity with Mohr's Circle for stress transformation
  • Basic knowledge of material properties, specifically in tensile testing
  • Concepts of shear stress and its maximum angle
NEXT STEPS
  • Study Mohr's Circle in detail to understand stress transformations
  • Explore the mechanics of materials, focusing on shear stress behavior
  • Learn about the implications of plane stress in engineering applications
  • Investigate the relationship between material properties and stress orientation
USEFUL FOR

Mechanical engineers, materials scientists, and students studying solid mechanics who seek to deepen their understanding of stress analysis and material behavior under different loading conditions.

FAlonso
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I can now although do the maths related to plane stress etc but I have struggled to grasp the logic behind this concept. It says changing the way you see the stress by rotating the view, stress changes. My question is why ? Why is this so that we see stress with one value when standing at let's say 0 degrees with the axis of pipe under stress and different when we see it from 45 degrees rotated ? Is it some inherent material property or the force isn't really acting the way as we think and show in free body diagrams ? Can someone put it up simple ?
 
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It's a function of mohrs circle. Plot the mohrs circle.you will see at different angles on the circle there is different stresses. In a real scenario if you put.steel in a tensile machine and pull it , it will shear at 45 degrees, this is because its maximum shear angle is 45 degrees
 

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