Maurice Tutor

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Teaching Since: May 2017
Last Sign in: 398 Weeks Ago, 6 Days Ago
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 26 Mar 2018 My Price 8.00

plastic extension

Bicycle chains often “stretch” during use. Referring to Example 12.4, this cannot be due to plastic extension or creep, because the material is hardened steel, with a factor of safety of 8.5 against yield. The stretch is in fact caused by wear between the links and the pins. I (D.R. Jones) find that I need to shorten my bicycle chain by 25 mm (two chain pitches) every five years or so. Estimate the radial wear on the pins and holes, assuming all contacting surfaces wear at the same rate. The number of links in the chain is currently 110. Take other dimensions from Example 12.4.

 

Example 12.4

The following diagram gives the dimensions of a steel bicycle chain. The chain is driven by a chain wheel which has pitch diameter of 190 mm. The chain wheel is connected to the pedals by a pair of cranks set at 180° in the usual way.

The center of each pedal is 170 mm away from the center of the chain wheel. If the cyclist weighs 90 kg, estimate the factor of safety of the chain. You may assume that a link would fail in simple tension at the position of minimum cross-sectional area and that a pin would fail in double shear. The yield strength of the steel is 1500 N m2.

 

Answers

Maurice Tutor
(5)
Status NEW Posted 26 Mar 2018 08:03 AM My Price 8.00

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