This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Inspection of Debonds in Adhesive Joints and Loosened Mechanical Fasteners Using Shearography with Multiple Frequency Vibrational Excitation
Technical Paper
2007-01-1213
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
To reduce costs and facilitate automation of joining processes, adhesive bonding has gained popularity as a replacement for conventional mechanical fastener, especially for bonding parts made of plastics and polymer composites. However, the adhesive bonding process is more susceptible to quality variations during manufacturing than traditional joining and fastening methods. Shearography, an optical technique that measures full-field surface deformation, has been extended to inspecting debonds. It detects a debond by measuring the debond's response to applied stresses. This paper describes a technique of shearography using multiple frequency vibration excitation as a means of stressing for detecting debonds with closed boundaries as well as open boundaries. The technique can also be used to detect loosened mechanical fasteners. This process can be fully automated for rapid inspection on factory floors.
Recommended Content
| Aerospace Standard | Knobs, Control Aircraft, Recommended Design |
| Technical Paper | The Design of Repairable Advanced Composite Structures |
| Journal Article | Analysis on Yield Tightening of Threaded Fasteners |
Authors
Topic
Citation
Hung, M. and Shang, H., "Inspection of Debonds in Adhesive Joints and Loosened Mechanical Fasteners Using Shearography with Multiple Frequency Vibrational Excitation," SAE Technical Paper 2007-01-1213, 2007, https://doi.org/10.4271/2007-01-1213.Also In
References
- Erf R.K. 1974 Holographic Nondestructive Testing Academic Press New York
- Vest C.M. 1979 Holographic Interferometry John Wiley
- Hung Y.Y. “Shearography: A New Optical Method for Strain Measurement and Nondestructive Testing,” Optical Engineering 1982 21 3 391 395
- Hung Y.Y. “Computerized Shearography and its Application for Nondestructive Evaluation of Composites” Manual on Experimental Methods of Mechanical Testing of Composites Jenkins C.H. Society for Experimental Mechanics 1998
- Hung Y.Y. Ho H. P. Shearography: An optical measurement technique and applications Material Science and Engineering 49 2005 61 87
- Shang H.M. Chau F.S. Tay C.J. Toh S.L. “Estimating the Depth and Width of Arbitrarily Oriented Disbonds in Laminates Using Shearography,” Journal of Nondestructive Evaluation 1990 9 1 19 26
- Shang H.M. Toh, S.L. Chau F.S. Shim V.P.W. Tay C.J. “Locating and Sizing Disbonds in Glassfibre-Reinforced Plastic Plates Using Shearography,” ASME Transactions, Journal of Engineering Materials and Technology 1991 113 99 103
- Shang H.M. Soh C.C. Chau F.S. “The Use of Carrier Fringes in Shearography for Locating and Sizing Debonds in GRP Plates,” Composites Engineering 1991 1 3 157 165
- Shang H.M. Tham L.M. Chau F.S. “Shearographic and Holographic Assessment of Defective Laminates with Bond-Lines of Different Elasticities,” ASME Transactions, Journal of Engineering Materials and Technology 1995 117 3 322 329
- Shang H.M. Toh S.L. Chau F.S. Tay C.J. Tay T.E. “Holographic Inspection of Laminated Plates Containing Two Fully-Overlapping Identical Debonds,” Journal of Nondestructive Evaluation 1991 10 1 7 17
- Hung Y.Y. “A Speckle-Shearing Interferometer: A tool for measuring derivatives of surface displacement” Optical Communications 11 2 132 135 1974
- Leendertz J.A. Butters J.N. “An Image Shearing Speckle Pattern Interferometer for measuring bending moments” J. of Physics: E., Sci. Instrum. 6 11 1107 1110 1973
- Hung Y.Y. Griffen C.T. “Digital Shearography versus TV-Holography for Vibration Measurement” Proc. The 15 th Biennial Conference on Mechanical Vibration and Noise and 1995 ASME Design Engineering Technical Conferences 3 1461 1470 Boston, Massachusetts September 17-20 1995
- Chen F. Griffen C.T. Hung Y.Y. “Stroboscopic Phase Shifting Shearography for Automated Vibration Measurement” Proc. The 15 th Biennial Conference on Mechanical Vibration and Noise and 1995 ASME Design Engineering Technical Conferences 3 1399 1415 Boston, Massachusetts September 17-20 1995
- Hung Y.Y. “Electronic Shearography for Measurement of Time-Dependent Deformation” Proc VII Int. Congress on Experimental Mechanics 2 674 678 Las Vegas, Nevada June 1992
- Hung Y.Y. Griffen C.T. Chen F. “High Speed Shearography for Measuring Transient Deformation and Vibration” Proc VIII International Congress on Experimental Mechanicals 206 207 Nashville, Tennessee June 10-13 1996