3D – Ultrasonic analysis
Failure investigations are carried out for industrial clients. The staff of AAC is experienced to identify failure modes, e.g. fatigue, overload, corrosion, delaminations… It has to be emphasised that AAC is independent to make unbiased investigations. Doing so the technician/project leader who is carrying out the investigation is only responsible to the technical manager of AAC.
Failure analysis can be performed using standard characterisation techniques. These investigations may include a metallurgical appraisal as to why a test piece failed at a lower than expected load or a characterisation of the fracture mode of a structural component during exposure to a particular environment. In addition NDT methods, dye methods and tailored ultrasonic test set-ups can be offered. The most universal being the ultrasonic inspection.
Olympus Omniscan MX
The Olympus OmniScan MX is an advanced, multi-technology flaw detector. It offers a high acquisition rate and powerful software features-in a portable, modular instrument to efficiently perform inspections.
The OmniScan MX2 (ultrasonic phased array) provides the ability to detect hidden corrosion, cracks and delaminations in multilayer structures. The 0-degree testing measures time-of-flight and amplitude of ultrasonic echoes reflecting from the part into gates in order to detect and measure defects.
Phased array technology generates an ultrasonic beam with the capability of setting beam parameters such as angle, focal distance, and focal point size through software.
Furthermore, this beam can be multiplexed over a large array. These capabilities open a series of new possibilities. For instance, it is possible to quickly vary the angle of the beam to scan a part without moving the probe itself. Inspecting a part with a variable-angle beam also maximizes detection regardless of the defect orientation, while optimizing signal-to-noise ratio.
Acoustic Emission Analyses
In addition to the mechanical testing, an acoustic emission apparatus will characterize the rupture process of composites or multiphase alloys before the ultimate failure. Acoustic Emission analysis is a non-destructive testing method capable of detecting and locating faults in mechanically loaded structures, components and specimens. AEA provides comprehensive information on the origin of faults in a loaded object and the development of the fault when subjected to continuous or repetitive stress. Acoustic Emission is the term used when defects in metals, plastics and other materials release energy when subjected to mechanical loading. The energy propagates in form of high frequency stress waves. These types of oscillations are then recorded as AE signals on the surface of the specimen. The AE analysis is the characterization of the signals according to intensity and frequency content, and also entails locating the release mechanisms by comparing signal travel times in a measurement procedure using several sensors.
Two different acoustic emission systems – one fixed installed 6 channel AMSY5 system from Vallen and one transportable 8 channel system from Physical Acoustic Cooperation (PAC) are available for in-house and external inspections. In addition the PAC system is equipped with a multiplexed signal generator card, allowing the whole system to be used as active guided ultrasonic wave system.