Ultrasonic stress measurement using the critically refracted longitudinal (LCR) ultrasonic technique
OwnerDon E. Brayinventor
Life of this patent
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Abstract
The latent stress in a material can be measured using critically refracted longitudinal ultrasonic technique. The system uses a frame to hold a hydraulic piston. The piston is used to apply an adjustable force against the probes. A signal is initiated by a first transducer. The signal is angled against the piece under test so as to create a critically refracted wave along the piece. The delay time to receive the wave at a first and second probe is measured. The delay time correlates to a stress in the piece.
Claims10
A method for measuring the internal stress in a material comprising the steps of:
- (a) applying a transducer probe in physical contact with the material;
- (b) applying at least one receiving probe in physical contact with the material;
- (c) applying a contact force at an interface between said probes and the material, comprising the steps of placing a variable force ram in physical contact with said probes, attaching a load frame to said variable force ram, and securing said load frame to the material;
- (d) transmitting a critically refracted longitudinal wave through the material from the transducer probe to the at least one receiving probe;
- and
- (e) calculating the internal stress of the material as a function of a travel time from the transducer probe to the at least one receiving probe of the longitudinal wave through the material.
A method for measuring the internal stress in a material comprising the steps of:
- (a) placing a first and a second receiving probes in forced contact with the material;
- (b) applying a contact force at an interface between said probes and the material, comprising the steps of placing a variable force ram in physical contact with said probes, attaching a load frame to said variable force ram, and securing said load frame to the material;
- (c) transmitting a critically refracted longitudinal ultrasonic wave through the material;
- (d) measuring the wave at the receiving probes;
- and
- (e) calculating the internal stress of the material as a function of a travel time of the longitudinal wave between said probes through the material.
Dependencies are inferred from the claim text.