Detection of compressive residual stresses using the method of c

Details Detection of compressive residual stresses using the method of c Detection of compressive residual stresses using the method of c

1989-05-16

1990-09-04

Evans, F. L.

Optics: measuring and testing

Material strain analysis

73800, G01B 1116

Patent

active

049539736

ABSTRACT:
The method of caustics employs a laser for illuminating an extended crack in stock sheet metallic material. A shadow area image is generated which has geometrical parameters which may be measured and applied to the calculation of stress intensity factor (K.sub.I). The variation of the shadow shape in response to specimen loading provides signatures corresponding with the degree and direction of residual stresses in the material adjacent a hole formed in the material. By determining stress-intensity factors and stress-intensity distributions, a higher degree of quality control for sheet stock material becomes possible in addition to allowing the assembling of such material in directions that will best counteract anticipated destructive external forces.

REFERENCES:
patent: 3854325 (1974-12-01), Coate
patent: 4119380 (1978-10-01), Raftopoulos et al.
patent: 4195929 (1980-04-01), Raftopoulos et al.
patent: 4255049 (1981-03-01), Sahm et al.
patent: 4547073 (1985-10-01), Kugimiya
"Plane Surface Strain Examination by Speckle-Pattern Interferometry Using Electronic Processing", Journal of Strain Analysis, vol. 9, No. 1, Jan. 1974, pp. 17-25.
"Speckle-Shearing Interferometric Technique: A Full-Field Strain Gauge", Applied Optics, vol. 14, No. 3, Mar. 1975, pp. 618-622.
"Application of the Method of Caustics to the Determination of the Ratio of Poisson's Ratio to the Modulus of Elasticity", J. Phys. D: Applied Physics, vol. 12, No. 8, Aug. 1979, pp. 1321-1324.

Affiliated with

Also associated with

Rating

Detection of compressive residual stresses using the method of c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Detection of compressive residual stresses using the method of c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of compressive residual stresses using the method of c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-437652