Precipitation hardening is the most common method in the strengthening of aluminium alloys. This method relies on the decrease of solid solubility with temperature reduction to produce fine precipitations which impede the movement of dislocations. The quality control of aluminium alloy specimens is an important concern of engineers. Among different methods, non-destructive techniques are the...

The development of NMR spectroscopic techniques was pushed significantly forward with the development of broad-band, pulsed-RF spectrometers aided by the Fast Fourier Transform (FFT). To this day, the older techniques using continuous-wave RF spectrometers are seldom used. However, continuous wave techniques may still hold a distinct advantage over pulsed techniques in regimes where the time-in...

We consider the time-harmonic eddy current problem in its electric formulation where the conductor is a polyhedral domain. By proving the convergence in energy, we justify in what sense this problem is the limit of a family of Maxwell transmission problems: Rather than a low frequency limit, this limit has to be understood in the sense of BOSSAVIT [11]. We describe the singularities of the solu...

Corrosion may develop and grow on steel pipes under layers of insulation cladding. Inspection the through these protective is paramount importance. Pulsed eddy current (PEC) a primary non-destructive testing (NDT) technique candidate for this type inspection as it requires no contact with material. To overcome variability in PEC signals due to variations cladding thickness, large measurement se...

For the forecasting of the fatigue life of metallic constructions it is important to understand the mechanism that leads to the failure. Neither, the continuum mechanics nor the micromechanics provide sufficient answers. However, a basic understanding of structural changes on different scaling levels is given by the physical Mesomechanics derived for a medium with local structure. For ferromagn...

In a surface-mounted sintered NdFeB permanent-magnet generator, the magnets are usually thin (typically 4 mm), and hence the armature reaction, due to the time harmonics in the stator currents, is high. NdFeB magnets are conducting (resistivity typically 1.6 μΩm) and experience eddy-current losses. Therefore, the combined eddy-current losses in the NdFeB magnets and a solid iron rotor may becom...