The fundamental purpose of employing a washer is to___________________?
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Answer: B. provide bearing area
Explanation
Flat washers serve to distribute the clamping force over a larger surface bearing area. This expanded bearing area prevents high bolt head pressures from damaging softer joint materials. Load distribution protects structural surfaces from crushing and localized indentation deformation. Washers are thin plates with a central hole placed beneath threaded fastener heads or nuts. Bearing stress is calculated as the clamping load divided by the total contact surface area. Standard flat washers are manufactured from various metals and plastics depending on application needs.
Using washers is vital when fastening timber, aluminum, or composite materials that crush easily. They also span oversized or clearance holes to ensure secure fastener head seating. Proper bearing area distribution maintains steady joint clamp loads over extended operational periods. Washers do not provide primary cushioning effects unless manufactured as specialized spring lock types. Absorbing shocks and vibrations is the specific job of lock washers rather than flat bearing washers. While they smooth contact surfaces, their primary mechanical purpose is enlarging the bearing area.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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