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Nondestructive Inspection for Quality Assurance of Fiber Reinforced Plastic Assemblies
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Abstract
THE QUALITY ASSURANCE OF FIBER reinforced plastic assemblies is accomplished at several Ford company and supplier facilities by the implementation of inspection technology developed to assure the integrity of adhesive bond joints and the adherend material of which the assemblies are made.
A low-frequency ultrasonic inspection method for the adhesive joints has been developed into a production-compatible method and was reported in references 1, 2, and 3. It uses a 25 kHz commercially available bond tester calibrated with reference specimens selected by a statistical procedure. Certain strength-related characteristics of the adherend material of the assembly, such as fiber orientation, can also be evaluated by measuring changes in the Lamb-wave velocity of 25 kHz acoustic waves propagated in the material by the bond tester. Glass concentration can be determined nondestructively by measuring the velocity of longitudinal ultrasonic waves propagated through the thickness of the material.
The development and implementation of this inspection technology has provided an effective NDI method for determining the tensile strength of the material, in a given direction, by indicating such strength-related properties as glass fiber concentration and orientation.
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Citation
Chapman, G., "Nondestructive Inspection for Quality Assurance of Fiber Reinforced Plastic Assemblies," SAE Technical Paper 820226, 1982, https://doi.org/10.4271/820226.Also In
References
- Chapman Gilbert B. II Papadakis, Emmanuel P. “A Procedure for Nondestructive Inspection of Adhesive Bonds in Fiberglass Reinforced Plastic Assemblies” presented at the National Fall Conference of the American Society for Nondestructive Testing October 1979
- Meyer Fred J. Chapman Gilbert B. II “Nondestructive Testing of Bonded FRP Assemblies in the Auto Industry” Adhesives Age 23 4 21 1980
- Chapman Gilbert B. II “A Nondestructive Method of Evaluating Adhesive Bond Strength in Fiberglass Reinforced Plastic Assemblies” presented at the American Society for Testing and Materials Symposium on Joining of Composite Materials April 1980
- American Society for Testing and Materials Annual Book of ASTM Standards
- Djiauw, Lie K. “Relation of Composite Part Strength to Ultrasonic Inspetion” Automotive Plastics Durability Conference Proceedings, Society of Automotive Engineers Technical Paper No. 811350 December 1981
- Frederick, Julian R. Ultrasonic Engineering John Wiley & Sons 1965
- Henderson, Harvey E. “Ultrasonic Velocity Technique for Quality Assurance of Ductile Iron Castings” The Iron Worker Summer 1976