Technical Papers – Archived
Airbus Paper on CVM (July 04) — 0.5Mb
CVM has the ability to monitor external surfaces of materials for crack initiation, propagation and corrosion. In addition, CVM sensors can also be embedded between components (e.g. lap joints) or within material compounds such as composite fibre. In this way, problems related to cracking, fatigue and corrosion can be detected when and where they are initiated.
Examination of Riveted Test Plates – report 5089/02 (July 02) — 2.1Mb
A number of riveted aluminium alloy test plates used for fatigue testing of aircraft type rivet joints were examined to determine the origin of the fatigue fractures produced at the rivet holes, and to determin the cause of anomalous Non Destructive Test (NDT) results after testing.
Evaluation of the Davey Crack Detection System (October 98) — 1.5Mb
Initial evaluation of CVM by BAe Systems in the UK as a method for detecting cracks in structural components. The report stated the technology showed promise and should be investigated further.
CVM™ – Demonstration over Aircraft Paint Systems (May 02) — 0.8Mb
An independent report by the Royal Melbourne Institute of Technology (RMIT) which determined there was no error in measuring the crack tip position through up to 60 µm of aircraft paint. For thicker paint applications of paint systems, a small linearly increasing error was measured.
Comparative Vacuum Monitoring – A new method of in-situ real time crack detection and monitoring (Sept 01) — 0.5Mb
A paper presented by SMS staff at the AINDT conference in Brisbane Australia in September 2001. The paper gives a general introduction to CVM and a summary of some applications at the time of writing.
Evaluation of a novel NDE for surface monitoring using laboratory fatigue specimens (June 01) — 0.4Mb
Paper presented at ICAF by the Australian Defence Science and Technology Organisation (DSTO) comparing the results of trials of test specimens in a laboratory using CVM, holographic laser interferometry and laser ultrasonics to detect crack initiation over a large area. Although both CVM and holographic laser interferometry both worked well, the CVM system was significantly easier to use.
New Vacuum Sensor for Detecting Cracks on Welds (March 02) — 0.5Mb
Paper from the Australian Defence Science and Technology Organisation (DSTO) for Welding Technology Institute of Australia’s International Conference on Technological and Research Developments in Welded Defence Equipment. The paper discusses the advantages of using CVM technology on welded submarine structure.
Notes on the industrial technologies for crack detection and condition monitoring — 0.2Mb
An internally generated document summarising the standard technologies for the detection and monitoring of cracks in a variety of industries. The paper discusses the advantages of each and gives a discussion of where SMS believes CVM fits within the current available technologies.
Examination of Fatigue Test Plates (Report Number: 5292/02
(October 02) — 1.2Mb
An independent investigation of lap-joint coupons fatigued by Structural Monitoring Systems. The coupons contained Thin Polymer Sensors (TPS) which detected cracking within the lap-joints. Standard NDI/NDT methods had been only partially successful in confirming the presence of the fatigue cracks. SEM was used to confirm the presence of small tight cracks.
Informal Evaluation of vacuum-based crack detection sensor (Report No AFRL/MLS 01-076
(Sept 01) — 1.3Mb
An evaluation of CVM to detect cracks in turbine blades. The cracks were grown using a four point bend test without a starter notch, and the CVM sensors detected cracks in all the specimens tested. CVM is compared to several other technologies, all of which were not suitable, or too labour intensive, for the unique testing regime used.
Laboratory Assessment of vacuum-based crack monitoring sensor (Sept 01) — 0.2Mb
A short summary document of the benefits of CVM sensors following the validation test program carried out at Wright-Paterson Air Force Base.