NeuDist (version 1.0.1)

stress31: Fatigue Life of 6061-T6 Aluminum Coupons under 31,000 psi

Description

Fatigue life measurements (in thousands of cycles) of 6061-T6 aluminum coupons cut parallel to the direction of rolling and oscillated at 18 cycles per second (cps). The dataset contains 101 observations and was originally analyzed by Birnbaum and Saunders (1969).

Usage

stress31

Value

An object of class "numeric".

The vector consists of 101 observed fatigue life measurements, expressed in thousands of cycles to failure, for individual 6061-T6 aluminum coupons tested under a maximum cyclic stress of 31,000 psi. Each value represents the number of load cycles endured by a coupon before failure. The dataset is widely used in reliability engineering and survival analysis to illustrate lifetime modeling and inference based on the Birnbaum--Saunders fatigue life distribution.

Format

A numeric vector of length 101 representing fatigue life measurements of aluminum coupons subjected to 31,000 psi maximum stress per cycle.

Details

This dataset corresponds to the well-known Birnbaum--Saunders fatigue life example. The data represent time-to-failure observations collected from aluminum coupons tested in a controlled experimental setup. These data have been widely used in the literature to illustrate lifetime modeling, particularly the Birnbaum--Saunders distribution.

References

Birnbaum, Z. W., & Saunders, S. C. (1969). Estimation for a family of life distributions with applications to fatigue. Journal of Applied Probability, 6, 328--347. tools:::Rd_expr_doi("10.2307/3212004")

Examples

data(stress31)

summary(stress31)

hist(
  stress31,
  main = "Fatigue Life at 31,000 psi",
  xlab = "Cycles to Failure (thousands)"
)