For a beam subjected to a moment, what is the relationship between bending stres

Practice Questions

Q1
For a beam subjected to a moment, what is the relationship between bending stress and moment?
  1. σ = M/I
  2. σ = I/M
  3. σ = M*I
  4. σ = M*E

Questions & Step-by-Step Solutions

For a beam subjected to a moment, what is the relationship between bending stress and moment?
  • Step 1: Understand that a beam can bend when a force is applied to it, creating a moment (M).
  • Step 2: Recognize that bending stress (σ) is the internal stress that develops in the beam due to this bending.
  • Step 3: Learn that the moment of inertia (I) is a property of the beam's cross-section that affects how it resists bending.
  • Step 4: Know the formula that relates bending stress (σ), moment (M), and moment of inertia (I): σ = M/I.
  • Step 5: Realize that as the moment (M) increases, the bending stress (σ) also increases if the moment of inertia (I) remains constant.
  • Bending Stress and Moment Relationship – The bending stress in a beam is directly proportional to the applied moment and inversely proportional to the moment of inertia of the beam's cross-section.
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