Fatigue data frame has 262 rows and 3 columns.
This data frame contains the following columns:
the test path (or test unit) identifier - a factor with levels
number of test cycles at which the measurement is made (millions of cycles).
relative crack length (dimensionless).
These data are given in Lu and Meeker (1993) where they state “We obtained the data in Table 1 visually from figure 4.5.2 on page 242 of Bogdanoff and Kozin (1985).” The data represent the growth of cracks in metal for 21 test units. An initial notch of length 0.90 inches was made on each unit which then was subjected to several thousand test cycles. After every 10,000 test cycles the crack length was measured. Testing was stopped if the crack length exceeded 1.60 inches, defined as a failure, or at 120,000 cycles.
Lu, C. Joseph , and Meeker, William Q. (1993), Using degradation measures to estimate a time-to-failure distribution, Technometrics, 35, 161-174
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