US4790188A
Expired / Lapsed
US
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Method of, and an apparatus for, evaluating forming capabilities of solid plate
Assignee: National Research Council Canada
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Filing: 1987-07-10
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Granted: 1988-12-13
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Expires: 2007-07-10
Abstract
Abstract A method of, and apparatus for, evaluating forming capabilities of metal plate by means of ultrasonic waves where the rolling direction and the density of the plate are known. The method comprises the steps of launching acoustic waves into the plate and detecting acoustic waves propagating in the plate to establish acoustic velocities in the plate along at least two different directions. Then the value of a certain plastic strain characteristic, like the average plastic strain ratio R or the planar strain ratio ΔR, is determined from a previously established empirical relationship between the velocities and the value of the plastic strain ratio R(α).
Inventors
- 👤 Jean F. Bussiere
- 👤 Cheng-Kuei Jen
- 👤 Irina D. Makarow
- 👤 Brigitte Bacroix
- 👤 Philippe H. Lequeu
- 👤 John J. Jonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:55
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/07; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
78 words
A rapid and non destructive method of evaluating forming capabilities of a solid plate of known density, the plate having a rolling direction, comprising; launching acoustic waves into the plate; detecting acoustic waves propagating in the plate to establish acoustic velocities in the plate along at least two different directions; and determining the value of a certain plastic strain characteristic from a previously established empirical relationship between the said velocities and the value of the plastic strain characteristic.
Claim 2
Dependent Claim
78 words
A rapid and non destructive method of evaluating forming capabilities of a solid plate of known density, the plate having a rolling direction, comprising; launching acoustic waves into the plate; detecting acoustic waves propagating in the plate to establish acoustic velocities in the plate along at least two different directions; and determining the value of a certain plastic strain characteristic from a previously established empirical relationship between the said velocities and the value of the plastic strain characteristic.
Claim 3
Dependent Claim
71 words
A method as defined in claim 1 wherein: the plastic strain characteristic is the average plastic strain ratio R; and the acoustic velocities are established in at least three directions comprising the rolling direction, a second direction forming an angle of 45° with the rolling direction in the plane of the plate and a third direction forming an angle of 90° with the rolling direction in the plane of the plate.
Claim 4
Dependent Claim
55 words
A method as defined in claim 2 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in the plane of the plate V SH , propagating in the three directions; and the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND .
Claim 5
Dependent Claim
51 words
A method as defined in claim 2 wherein the acoustic velocities are: the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three directions; and the acoustic velocities of longitudinal waves V L propagating in the three directions.
Claim 6
Dependent Claim
60 words
A method as defined in claim 2 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in the plane of the plate V SH , propagating in the three directions; and the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three directions.
Claim 7
Dependent Claim
55 words
A method as defined in claim 2 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three directions; and longitudinal waves propagating in a direction normal to the plane of the plate V LND .
Claim 8
Dependent Claim
73 words
A method as defined in claim 2 wherein the acoustic velocities established are: the acoustic velocities of longitudinal waves V L propagating in the three directions; the acoustic velocities of shear waves, polarized in the plane of the plate V SH , propagating in the three directions; and the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three directions.
Claim 9
Dependent Claim
79 words
A method as defined in claim 2 wherein the acoustic velocities are: the acoustic velocities of shear waves, polarized in the plane of the plate V SH , propagating in the three directions; the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three directions; and the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND .
Claim 10
Dependent Claim
39 words
A method as defined in claim 1 wherein the plastic strain characteristic is the plastic strain ratio along a probed direction R(α), the probed direction forming an angle α with the rolling direction in the plane of the plate.
Claim 11
Dependent Claim
134 words
A method as defined in claim 9 wherein the acoustic velocities established are: the acoustic velocity of shear waves, polarized in a plane normal to the plane of the plate, propagating in the probed direction V SV (α); the acoustic velocity of shear waves, polarized in the plane of the plate, propagating in the probed direction V SH (α); the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND ; the acoustic velocity of shear waves, polarized in the rolling direction, propagating in a direction normal to the plane of the plate V SIND ; and the acoustic velocity of shear waves polarized in a direction perpendicular to the rolling direction, propagating in a direction normal to the plane of the plate V S2ND .
Claim 12
Dependent Claim
144 words
A method as defined in claim 9 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in the plane of the plate, propagating in the probed direction V SH (α) and in the rolling direction V SH (α); the acoustic velocity of shear waves, polarized in a plane normal to the plane of the plate, propagating in the probed direction V SV (60 ); the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND ; the acoustic velocity of the shear waves, polarized in the rolling direction, propagating in a direction normal to the plane of the plate V SIND ; and the acoustic velocity of shear waves, polarized in a direction perpendicular to the rolling direction, propagating in a direction normal to the plane of the plate V S2ND .
Claim 13
Dependent Claim
130 words
A method as defined in claim 9 wherein the acoustic velocities established are: the acoustic velocity of longitudinal waves propagating in the probed direction V L (α); the acoustic velocities of shear waves, polarized in the plane of the plate, propagating in the probed direction V SH (α) and the rolling direction V SH (o); the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND ; the acoustic velocity of shear waves, polarized in the rolling direction, propagating in a direction normal to the plane of the plate V SIND ; and the acoustic velocity of shear waves, polarized in a plane perpendicular to the rolling direction, propagating in a direction normal to the plane of the plate V S2ND .
Claim 14
Dependent Claim
70 words
A method as defined in claim 1 wherein: the plastic strain characteristic is the planar strain ratio ΔR; and the acoustic velocities are established in at least three directions comprising the rolling direction, a second direction forming an angle of 45° with the rolling direction in the plane of the plate and a third direction forming an angle of 90° with the rolling direction in the plane of the plate.
Claim 15
Dependent Claim
101 words
A method as defined in claim 13 wherein the acoustic velocities established are: the velocity of longitudinal waves propagating in the three directions V L ; the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND ; the acoustic velocity of shear waves, polarized in the rolling direction, propagating in a direction normal to the plane of the plate V SIND ; and the acoustic velocity of shear waves, polarized in a direction perpendicular to the rolling direction, propagating in a direction normal to the plane of the plate V S2ND .
Claim 16
Dependent Claim
134 words
A method as defined in claim 13 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three directions; the acoustic velocities of shear waves, polarized in the plane of the plate V SH , propagating in the three directions; the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND ; the acoustic velocity of shear waves, polarized in the rolling direction, propagating in a direction normal to the plane of the plate V SIND ; and the acoustic velocity of shear waves, polarized in a direction perpendicular to the rolling direction, propagating in a direction normal to the plane of the plate V S2ND .
Claim 17
Independent Claim
50 words
A method as defined in 13 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three direction; and acoustic velocities of longitudinal waves V L propagating in the three directions.
Claim 18
Independent Claim
50 words
A method as defined in 13 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in a plane normal to the plane of the plate V SV , propagating in the three direction; and acoustic velocities of longitudinal waves V L propagating in the three directions.
Claim 19
Dependent Claim
109 words
A method as defined in claim 13 wherein the acoustic velocities established are: the acoustic velocities of shear waves, polarized in the plane of the plate V SH , propagating in the three directions; the acoustic velocity of shear waves, polarized in the rolling direction, propagating in a direction normal to the plane of the plate V SIND ; the aromatic velocity of shear waves, polarized in a direction perpendicular to the rolling direction, propagating in a direction normal to the plane of the plate V S2ND ; and the acoustic velocity of longitudinal waves propagating in a direction normal to the plane of the plate V LND .
Claim 20
Independent Claim
139 words
An apparatus for rapidly and non destructively evaluating forming capabilities of a solid plate, comprising: acoustic wave launching/detecting system for launching and detecting acoustic waves in the plate along at least two different directions, the launching/detecting system having several transducers and the distance between some of the said transducers is known to determine acoustic velocities in the plate along at least two different directions; computer means, connected to the lauching/detecting system, for establishing velocities of acoustic waves propagating in the plate along at least two different directions and for determining the value of a plastic strain characteristic from a previously established empirical relationship between the said velocities and the value of the said plastic strain characteristic; and display means for displaying the value of the said plastic strain characteristic which is indicative of the forming capabilities of the plate.
Claim 21
Independent Claim
139 words
An apparatus for rapidly and non destructively evaluating forming capabilities of a solid plate, comprising: acoustic wave launching/detecting system for launching and detecting acoustic waves in the plate along at least two different directions, the launching/detecting system having several transducers and the distance between some of the said transducers is known to determine acoustic velocities in the plate along at least two different directions; computer means, connected to the lauching/detecting system, for establishing velocities of acoustic waves propagating in the plate along at least two different directions and for determining the value of a plastic strain characteristic from a previously established empirical relationship between the said velocities and the value of the said plastic strain characteristic; and display means for displaying the value of the said plastic strain characteristic which is indicative of the forming capabilities of the plate.
Claim 22
Dependent Claim
30 words
An apparatus as defined in claim 18, further comprising a thickness evaluating means, connected to the computer means, for generating a thickness signal responsive to the thickness of the plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |