Applications involving unidirectional stresses utilize this thread profile____________________?
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Answer: B. buttress
Explanation
Buttress threads feature a unique profile with one nearly vertical flank and one sloping flank side. The vertical flank transmits heavy axial loads efficiently without creating radial wedging forces that burst nuts. The sloping flank allows easy engagement and low frictional resistance during return or positioning strokes. Thread profiles are standardized geometric shapes designed for specific mechanical power transmission and fastening tasks. Unidirectional stress applications involve heavy mechanical forces acting exclusively in one single axial direction. Standard symmetric thread profiles distribute loads equally in both directions but fail efficiently under high unilateral forces.
Metric threads are general-purpose fasteners designed for bidirectional clamping rather than heavy unidirectional power transmission. Acme threads transmit power in both directions and are widely used in lead screws on machine tools. Square threads offer high efficiency for bidirectional loads but lack the robust angled load-bearing flank of buttress threads.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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