Cum se calculează Bending Stress
Ce este Bending Stress?
Bending stress is normal stress from moment loading, the primary stress in beams. It varies linearly across the section, maximum at outer fibers.
Formulă
Calculate: σ = M×c/I where M is moment, c is distance from neutral axis, I is moment of inertia
- M
- I/c) — I/c)
- I
- I value — Variable used in the calculation
Ghid pas cu pas
- 1Calculate: σ = M×c/I where M is moment, c is distance from neutral axis, I is moment of inertia
- 2Or: σ = M/S where S is section modulus (S = I/c)
- 3Results show stress distribution
Exemple rezolvate
Intrare
M = 50 kN·m, I = 1×10⁹ mm⁴, c = 200 mm
Rezultat
σ = 10 MPa at extreme fiber
Safe stress level
Greșeli frecvente de evitat
- ✕Using average stress instead of maximum stress
- ✕Forgetting compression and tension can develop simultaneously
Întrebări frecvente
Why does stress vary across the beam?
Outer fibers experience maximum stretch/compression; inner material near neutral axis experiences less.
How is section modulus useful?
S directly gives maximum stress: σ_max = M/S, simpler than calculating I and c separately.
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