Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1996-04-03
1996-12-31
Chilcot, Richard
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
73785, 376260, F16B 3102
Patent
active
055896405
ABSTRACT:
In a boiling water reactor having a core shroud disposed within a reactor vessel and a plurality of tie rods installed between vertically spaced sites on the core shroud as part of a core shroud repair, a method of measuring tie rod preload after installation includes the steps of lowering a tool into the reactor vessel from a remote location positioned externally of the reactor vessel, attaching the tool to an upper portion of a tie rod, using the tool to apply a tensile load along a longitudinal axis of the tie rod, measuring the tensile load applied to the tie rod, measuring axial displacement of the tie rod in response to the applied tensile load, plotting the applied load versus the axial displacement measured, and identifying a change in slope on the load-displacement plot occurring at a load corresponding to the tie rod preload.
REFERENCES:
patent: 3008362 (1961-11-01), Tucker, Jr.
patent: 3015975 (1962-01-01), Biach
patent: 3115332 (1963-12-01), Singleton et al.
patent: 3162071 (1964-12-01), Biach
patent: 3382709 (1968-05-01), Sorensen
patent: 3561260 (1971-02-01), Reynolds
patent: 3722332 (1973-03-01), Jones
patent: 3759090 (1973-09-01), McFaul et al.
patent: 3837694 (1974-09-01), Frisch et al.
patent: 3844533 (1974-10-01), Markiewicz et al.
patent: 3877326 (1975-04-01), Kock et al.
patent: 3943819 (1976-03-01), Charron
patent: 3969810 (1976-07-01), Pagano
patent: 3969960 (1976-07-01), Pagano
patent: 3995828 (1976-12-01), Orban
patent: 4027559 (1977-06-01), Wallrafen
patent: 4047456 (1977-09-01), Scholz
patent: 4062227 (1977-12-01), Heyman
patent: 4175453 (1979-11-01), Exner et al.
patent: 4185504 (1980-01-01), Exner et al.
patent: 4185505 (1980-01-01), Exner et al.
patent: 4185506 (1980-01-01), Exner et al.
patent: 4273011 (1981-06-01), Exner et al.
patent: 4295393 (1981-10-01), Adcock
patent: 4333351 (1982-06-01), Bickford
patent: 4454790 (1984-06-01), Rieben
patent: 4494412 (1985-01-01), Hardy
patent: 4535656 (1985-08-01), Orban
patent: 4659065 (1987-04-01), Simms
patent: 5343785 (1994-09-01), Holt et al.
patent: 5392322 (1995-02-01), Whitling et al.
patent: 5402570 (1995-04-01), Weems et al.
patent: 5452629 (1995-09-01), Heiermann et al.
patent: 5502754 (1996-03-01), Erbes
Lipford, B., et al, "Three Mile Island Revisited," Mechanical Engineering, pp. 42-47, Jan. 1991.
Amrozowicz Paul D.
Chilcot Richard
LandOfFree
Method for detecting changes in preload on a tie rod installed a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for detecting changes in preload on a tie rod installed a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for detecting changes in preload on a tie rod installed a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1143302