Quiz_5_EMA_4714key

Quiz_5_EMA_4714key - Quiz 5 Key March 29, 2007 EMA 4714 -...

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Quiz 5 Key EMA 4714 - Materials Selection and Failure Analysis March 29, 2007 Name ______________________________________ 1. [10 points] An experiment is conducted to determine whether fracture toughness of a quench and tempered alloy steel has been improved by a decrease in austenitizing temperature. K 1c determinations were made for two groups of samples, one austenitized at A 3 +25 degrees, the other at A 3 +25 degrees. The results of the test are contained within the table shown below. Based upon your analysis, is there a statistically significant improvement in fracture toughness derived from using the lower austenitizing temperature? [Use a significance level of p < 0.05. ************************************************************************ F = 7.52 2 /6.44 2 = 1.364; for ν 1 = 11, ν 2 = 9, F ν 1, ν 2 [ α = 0.05] = 3.10: therefore we assume that σ 1 = σ 2 and use test statistic 6 from Table 10.3 of your text. H
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This note was uploaded on 07/24/2011 for the course EMA 4714 taught by Professor Staff during the Spring '08 term at University of Florida.

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Quiz_5_EMA_4714key - Quiz 5 Key March 29, 2007 EMA 4714 -...

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