Quality control of fiber-reinforced composites by means of the shearographic and holographic methods

Wolfgang Steinchen

doi:10.1117/12.140804

15 February 1993 Quality control of fiber-reinforced composites by means of the shearographic and holographic methods

Wolfgang Steinchen

Proceedings Volume 1756, Interferometry: Applications; (1993) https://doi.org/10.1117/12.140804
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The shearographic and holographic interferometry were employed as nondestructive testing (NDT) methods for detecting flaws and delaminations in fiber reinforced composites. Different nondestructive loading techniques were utilized to stress the composites. Using shearography two states of deformation are recorded by double-exposing a Holotestfilm in an ordinary camera. In the tele-lens of the camera a shearing element inside resp. outside the focus is integrated. Rigid body motions of the specimen are not recorded. Local deformation irregularities caused by a defect under the surface of the specimen are not superimposed by an interference pattern, e.g., in the case of the internal pressure differential. The shearogram shows dark and bright fringes which can be interpreted as the gradient of the deformation. The represented shearograms compared with the equivalent holograms show the detection of the irregularities which can be analyzed by an image processing system.

Citation Download Citation

Wolfgang Steinchen "Quality control of fiber-reinforced composites by means of the shearographic and holographic methods", Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); https://doi.org/10.1117/12.140804

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available