# HW08 - ME 382 Fall 2011 Homework 8(Due on Friday Question...

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ME 382 Fall 2011 Homework 8 (Due on Friday, November 11, 2011) Question numbers are from third editions of the textbooks Answers given have generally been rounded, so you may get slightly different values. 1. Dowling Problem 8.27 (300-M: K Ic = 65 MPa√m, σ Y =1740 MPa; A517-F: K Ic =187 MPa√m; σ Y =760 MPa) Answer:(a) yes for yielding, no for fracture (b) yes for yielding, yes for fracture (c) 113 MPa√m (d) 3 2. Dowling Problem 8.35 (a) and (b) only 3. Dowling 8.42

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Answer: (a) K Q =50 MPa√m (b) yes (c) 0.138 mm 4. Ashby & Jones I: 16.3
5. Ashby & Jones I: 16.6

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6. A laboratory experiment to measure the Weibull parameters for an alumina produced the following results: m = 10, S o = 400 MPa (with V o = 500 mm 3 ) . a. Calculate the median tensile load for failure of the component shown below, when loaded by a force F as shown below. ( Answer: 24 kN) Hint: (i) Write an expression for the width of the sample in terms of y (distance from one end)
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HW08 - ME 382 Fall 2011 Homework 8(Due on Friday Question...

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