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Title: New Applications of Structural and Process Measurements for the Quality Assurance of Rubber to Metal Bonded Springs
Author: Bradley, Stuart
ISNI:       0000 0001 3475 9937
Awarding Body: Brunel University
Current Institution: Brunel University
Date of Award: 2006
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This research describes the application of vibration and structural measurement techniques to ensure rubber to metal bonded spring quality. The use of VibroAcoustic Emission in the manufacturing process in a robust and reliable method is described and together with the use of structural measurement techniques, offers rubber-to-metal spring manufacturers an adaptable and robust set of tools which to assure product conformance and quality. The first technique is capable of detecting cracks, lamination, porosity and inclusions on single-layer, double or single-bonded components. This is made by measurement of the structural response of the product to a knO\Vl1 energy input, and normalising the resulting modal response by a factor proportional to the spring pseudo-static stiffness. The second technique, using Vibro-Acoustic Emission, detects the formation of cracks and disbond during a conventional tensile or shear bond test. The natural micro-void cracking detected can be discriminated from a bond-failure event by using a lower frequency range that uses the dynamic response of the supporting metals as a filter (thus 'vibro-acoustic emission'). This new technique can be used to differentiate between bond ruptures and dynamic Mullins effect noise by the use of data processing filters and optimised test timing. The implementation of a production line test system is described, allowing the analysis of potential enhancements and future improvements to the manufacturing process and the test process.
Supervisor: Not available Sponsor: Not available
Qualification Name: Brunel University, 2006 Qualification Level: Doctoral
EThOS ID:  DOI: Not available