Fatigue Crack Growth in Reliability
Description
Fatigue Crack Growth in Reliability estimates the distribution
of material lifetime due to mechanical fatigue efforts. The FCGR
package provides simultaneous crack growth curves fitting to
different specimens in materials under mechanical stress efforts.
Linear mixed-effects models (LME) with smoothing B-Splines
and the linearized Paris-Erdogan law are applied. Once defined
the fail for a determined crack length, the distribution function
of failure times to fatigue is obtained. The density function is
estimated by applying nonparametric binned kernel density estimate
(bkde) and the kernel estimator of the distribution function (kde).
The results of Pinheiro and Bates method based on nonlinear
mixed-effects regression (nlme) can be also retrieved. The package
contains the crack.growth, PLOT.cg, IB.F, and Alea.A (database) functions.