superalloy: Nickel-based Superalloy Fatigue Test

In Auburngrads/SMRD: Statistical Methods For Reliability Data

Description

Nelson (1990) presents and analyzes life data from a strain-controlled, low-cycle fatigue test performed on 26 cylindrical specimens of a nickel-base superalloy. Four of the specimens were removed from the test before failure. In addition to recording the number of cycles to failure, the level of pseudostress (Young's modulus times strain) was also measured. The initial purpose of Nelson's analysis was to estimate the curve giving the number of cycles at which .1% of the population of such specimens would fail, as a function of pseudostress.

Format

A data.frame with 23 rows and 6 variables:

[, 1]	kilocycles	Accumulated cycles at event (in thousands)	Numeric
[, 2]	event	Event observed at kcycles (failure/right-censored)	Categoric
[, 3]	count	Number of events observed at kcycles	Numeric
[, 4]	pstress	Pseudo-stress applied derated	Numeric
[, 5]	lpstress	Log[pseudo-stress] (ln[pstress])The log base e transformation of the Pseudo-Stress	Numeric
[, 6]	lpstress2	Square of log[pseudo-stress] (ln[pstress]^2)	Numeric

Source

Nelson, W. (1990), Accelerated Testing: Statistical Models, Test Plans, and Data Analyses, New York, NY; John Wiley \& Sons.

Auburngrads/SMRD documentation built on Sept. 14, 2020, 2:21 a.m.