Boots – shoes – and leggings
Patent
1988-05-31
1989-10-17
Lall, Parshotam S.
Boots, shoes, and leggings
36455102, 364508, 356237, 358106, 340679, G06F 1520, G01M 700, G01N 2116
Patent
active
048751707
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.
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Kaneko Ryoichi
Miyata Hiroshi
Sakurai Shigeo
Toriya Hajime
Tsubouchi Kuniyoshi
Hitachi , Ltd.
Lall Parshotam S.
Mattson Brian M.
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