Non Destructive Testing

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.

Non-Destructive Testeing_1Failure 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

Non-Destructive Testing_2The 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.

Non-Destructive Testing_3Furthermore, 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.