Ultrasonic evaluation of residual stresses in aero engine materials using bulk and Rayleigh surface waves

Abstract

The evaluation of residual stresses using ultrasound can be a very complex issue, because different material properties may effect the propagation of ultrasonic waves. Nevertheless, in the manufacturing of modern aero engines it is essential to benefit from the full potential of the employed materials. In this context, it is indispensable to test whether ultrasonic stress measurement is applicable for the highly developed nickel- and titanium-based alloys. This contribution contains basic investigations on the achievable measurement effect in samples made of Inconel IN718 and the Titanium alloy Ti 6-2-4-6. Furthermore, we give an overview over the principles of ultrasonic stress measurement using bulk and Rayleigh waves and present first results which are discussed with respect to texture effects and future work

Inversion of residual stress profiles from ultrasonic Rayleigh wave dispersion data

“…Figure 2 reveals that v R /v (σ S ) j strongly depends on Table 1. Mass density, Lamé's and Murnaghan's constants describing second and third order elasticity effects in different materials, after [23] (Ti), [9] (Si), [24] (Al) and [25] (steel). The three sets of Ti constants were measured in three distinct samples.…”

Uncovering microstructural heterogeneities in binder jet printed SS316L through ultrasonic testing and X-ray computed tomography

“…Through theoretical and experimental studies, the interaction of ultrasonic (i.e., elastic) waves with solid media can be quantitatively linked to internal features. Past studies in polycrystalline materials have investigated the effect of pores [14][15][16], grain size [17] and morphology [18], texture [19][20][21], residual stress [22,23], and elastic constants [24]. For several decades, these studies have focused on metals generated using traditional manufacturing techniques.…”