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Question: 9 the stress concentration factor k is the ratio between...

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9. The stress concentration factor k is the ratio between the maximum stress ơmax and the average stress ơave, k-9m./ơave. For a plate of width D with a central hole of- diameter d loaded with an axial force F (see figure), the maxi mum stress is at the edge of the hole, and the average stress is given by ơave-F/[t(D-d)], where, is the thickness of the plate. The stress concentration factor measured in five tests with plates with different ratios of d/D is shown in the table. dD 0.05 0.25 0.45 0.65 0.85 k 2.91 2.40 2.17 2.1 2.03 (a) Use an exponential function k-bemD) to model the relationship between k and d/D.Determine the values of b and m that best-fit the data. (b) Plot the data points and the curve-fitted model. (c) Use the model to predict the stress concentration factor for d/D-0.1
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