Remote and powerless miniature fatigue monitor and method

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

73762, 73799, 73849, 73786, G01N 300

Patent

active

055311237

ABSTRACT:
A method and passive monitor for measurement of fatigue is provided. The method includes locating regions of high stress on a structure or material to be monitored, identifying the direction of principal stresses, and then aligning and bonding a specially fabricated passive fatigue monitor to the structure. After the structure has been subjected to a stress cycle, the passive fatigue monitor is removed and the striations formed in the monitor are evaluated. If necessary, contrast enhancement of striations can be performed prior to striation evaluation. Data from evaluations is assessed using rain flow cycle counting and Miners cumulative damage algorithms. The passive fatigue monitor is a small coupon of material fabricated from aluminum or other material known to form well-defined striations. The monitor is specially modified to contain a precrack which provides the location for striation formation.

REFERENCES:
patent: 2294897 (1942-09-01), Ellis
patent: 2724964 (1955-11-01), Singdale
patent: 2924094 (1960-02-01), Hast
patent: 3765230 (1973-10-01), Bohm et al.
patent: 3774443 (1973-11-01), Green et al.
patent: 3779071 (1973-12-01), Thomas, Jr. et al.
patent: 3786679 (1974-01-01), Crites
patent: 3789657 (1974-02-01), Ching, Jr. et al.
patent: 3979949 (1976-09-01), Smith
patent: 4107980 (1978-08-01), Crane et al.
patent: 4255049 (1981-03-01), Sahm et al.
patent: 4255974 (1981-03-01), Dufrane et al.
patent: 4292851 (1981-10-01), Brewer
patent: 4546652 (1985-10-01), Virkar et al.
patent: 4590804 (1986-05-01), Brull
patent: 5022275 (1991-06-01), Satoh et al.
patent: 5105667 (1992-04-01), Satoh et al.
patent: 5227731 (1993-07-01), Prabhakaran et al.
patent: 5237875 (1993-08-01), de la Veaux
patent: 5325721 (1994-07-01), Pendergrass, Jr.
patent: 5425274 (1995-06-01), Creamer

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Remote and powerless miniature fatigue monitor and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Remote and powerless miniature fatigue monitor and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Remote and powerless miniature fatigue monitor and method will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1498268

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.