A force P of 70 N is applied by a rider to thefront hand brake of a bicycle (P is the resultant of anevenly distributed pressure). As the hand brake pivots atA, a tension T develops in the 460-mm long brake cable(Ae = 1.075 mm2 ), which elongates by δ = 0.214 mm.Find the normal stress d and strain in the brake cable. Brake cable, L= 460 mm Hand brake pivot A37.5 mmP (Resultantof distributedpressure)50 mm- Uniform handbrake pressure100 mm

Given: We draw free body diagram of hand brake: Here,P=Applied loadT=Tesnion in cableNet moment…

Answered: Brake cable, L= 460 mm Hand brake pivot…

Brake cable, L= 460 mm Hand brake pivot A 37.5 mm P (Resultant of distributed pressure) 50 mm - Uniform hand brake pressure 100 mm

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter51: Drum Brakes

Section: Chapter Questions

Problem 2RQ: Explain how drum brakes create a self-multiplying brake force.

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Concept explainers

Types of loading

In mechanical terminology, the term load indicates that external force/weight, either constant or variable, acts on a mechanical member/structure. The weight of an object of a specific material is also an external load, and the external force that works on a structure comes under the categories of loading. The external load generates its effects as stress and strain in the structure.

Question

A force P of 70 N is applied by a rider to the
front hand brake of a bicycle (P is the resultant of an
evenly distributed pressure). As the hand brake pivots at
A, a tension T develops in the 460-mm long brake cable
(A_e = 1.075 mm² ), which elongates by δ = 0.214 mm.
Find the normal stress d and strain in the brake cable.

Brake cable, L= 460 mm Hand brake pivot A
37.5 mm
P (Resultant
of distributed
pressure)
50 mm
- Uniform hand
brake pressure
100 mm

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