Figure P8.39 shows a 1/2-in. pitch roller chain plate, as used on a bicycle chai

Question

Figure P8.39 shows a 1/2-in. pitch roller chain plate, as used on a bicycle chain. It is made of carbon steel, heat-treated to give Su = 140 ksi and Sy = 110 ksi. All surfaces are comparable to the "machined" category. Since a roller chain cannot transmit compression, the link is loaded in repeated axial tension (load fluctuates between 0 and a maximum force as the link goes from the slack side to die tight side of the chain) by pins that go through the two holes. Estimate the maximum tensile force that would give infinite fatigue life with a safety factor of 1.2. [Ans.: 229 lb] FIGURE P8.39

Explanation / Answer

170 ksi

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