Patent · US Expired

Method and apparatus for estimating life expectancy of mechanical structures

US4875170A · kind A · utility

28Cited by
9References
13Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 31, 1988
Grant dateOct 17, 1989
Priority date
Expiry dateMay 31, 2008

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01N2201/102
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

The life expectancy of a mechanical structure that undergoes repeated loading is estimated by determining the maximum crack length on the surface of the structure. The maximum length of the cracks on the surface of the structure is related to the life ratio of the structure, wherein the life ratio is a ratio of the number of loads the structure has undergone to the number of loads the structure will undergo until failure. An optical system is used to measure the crack length of the cracks on the surface of the structure being inspected. A statistical distribution of greatest length cracks for a sampling of areas within a larger area can be made. Apparatus is provided to statistically process such distribution data to obtain a statistically estimated maximum length crack for the larger area. The maximum crack length determination can be used to estimate the life expectancy of the structure from the relationship between crack length and life ratio.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.