3
Most of the gears fail from
(A) . bending fatigue
(B) . surface wear
(C) . stiff housing
(D) . pitting
(©). curved surfaces
Choose the correct answer from the options given below:
EXPLANATION
Design of Crop Dryers & Aeration Systems
- Primary Failure Modes of Machine Gears:
- In mechanical power transmission, the predominant modes of gear tooth failure are:
- Bending fatigue: Repeated cyclic cantilever loading causing fatigue cracks to initiate at the root fillet and propagate across the tooth base.
- Surface wear: Abrasive, adhesive, or corrosive material removal across sliding tooth flanks.
- Pitting (Surface fatigue): Cyclic subsurface contact shear stresses exceeding fatigue endurance limit, causing small metal flakes to dislodge from pitch-line surfaces.
- (C) Stiff housing and (E) curved surfaces are design features, not failure mechanisms.
- Conclusion: Most gears fail from (A), (B) and (D) only (Option 2).
Correct option: (2) (A), (B) and (D) only,
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