Shaft Torque vs Stress Explained
Quand cela s’applique
Use this guide when you need to explain how a shaft can carry torque yet still fail on stress or stiffness long before a detailed machine-element study is complete.
Outil à utiliser
Estimer la contrainte de torsion et l'angle de vrillage pour un arbre circulaire.
Ouvrir Calculateur couple et contrainte d'arbre →Étapes
- 1Start from the applied torque and the shaft geometry you are screening.
- 2Compute the shaft polar moment and peak torsional shear stress.
- 3Estimate angle of twist if shaft length and shear modulus matter for stiffness.
- 4Compare solid and hollow concepts on both stress and torsional stiffness logic.
- 5Escalate to fatigue, keyway, and combined-loading checks for final shaft design.
Exemples
- Checking whether a shaft concept is stress-driven or twist-driven.
- Comparing hollow and solid shafts for the same torque requirement.
Ce qu’il faut éviter
- Confusing torque capacity with allowable stress directly.
- Ignoring stress concentrations from keyways or shoulders.
- Skipping twist checks when alignment or backlash matters.
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FAQ
Does a lower stress always mean a better shaft?
Not necessarily. Stiffness, fatigue, geometry, and manufacturability can still govern.
Can I use this for keyways and splines?
Not directly. This guide assumes a simple circular shaft without local concentration features.
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