We also apply the proposed tests to the data on failure of switches given in [14] by artificially creating missing causes of failure.
Firstly, no data on failure of preoperative core biopsy were available in our series.
The micromechanically established failure envelopes are compared with the well known macrolevel based failure surfaces and with experimental data of multiaxial failure stresses found in the literature.
Nevertheless, in this work, instead of using experimental data, prevision of failure is achieved by fully numerical means.
The probabilities of outage of equipment are calculated using statistical data of component failure rates.
For data of cascading failure, the relationship between the intermediate data and result data cannot be obtained in advance.
The original data of operational failures covered the above five systems were screened and calculated statistically, including a total of 8000 entries from January 2009 to December 2013.
Customary databases present only previously stored data of equipment failures but, for carrying out a comprehensive PEFs management it is necessary to have access to the PEFs desired knowledge and not only stored data.
By filtering, classification, and the preprocessing of the failure data, the numbers of failure and mean operating time between failures were obtained for each subsystem.
Failure data regarding values of failure and repair rates are usually preferred to be expressed in linguistic terms which are easily and preferably expressed as triangular fuzzy numbers.
