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

2014 ◽  
Author(s):  
Sebastian Hubel ◽  
Alexander Dillhöfer ◽  
Hans Rieder ◽  
Martin Spies ◽  
Joachim Bamberg ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Surface Waves ◽  
Rayleigh Surface Waves ◽  
Ultrasonic Evaluation ◽  
Aero Engine

Measurement of Residual Stresses in Linear Friction Welded In-Service Inconel 718 Superalloy

2016 ◽  
Vol 879 ◽  
pp. 1800-1806 ◽  
Author(s):  
M. Smith ◽  
L. Bichler ◽  
D. Sediako
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Base Material ◽  
Peak Stress ◽  
Weld Interface ◽  
Aerospace Alloys ◽  
Aero Engine ◽  
Linear Friction ◽  
Inconel 718 Superalloy ◽  
Residual Strains

Measurement of residual strains by neutron diffraction of linear friction welded Inconel® 718 (IN 718) superalloy acquired from a mid-service aero-engine disk was undertaken in this study. Residual strain and stress throughout the various weld regions including the heat affected zone (HAZ), thermomechanical affected zone (TMAZ) and dynamically recrystallized zone (DRX) were characterized. The residual stresses were observed to increase from the base material to the weld interface, with a peak stress at the weld interface in all orthogonal directions. The trends for residual stress across the weld are in agreement with other work published in literature for solid state welding of aerospace alloys, where high residual stresses were commonly reported at the weld interface.

Ultrasonic Evaluation of Compressive Residual Stress of Surface Treated Metals

2005 ◽  
Vol 490-491 ◽  
pp. 184-189 ◽  
Author(s):  
Farid Belahcene ◽  
Xiaolai Zhou ◽  
Jian Lu
Keyword(s):  
Experimental Data ◽  
Residual Stresses ◽  
Nondestructive Evaluation ◽  
Subsurface Layer ◽  
Surface Mechanical Attrition Treatment ◽  
Shallow Subsurface ◽  
Ultrasonic Evaluation ◽  
Mechanical Attrition ◽  
Machine Parts ◽  
Compressive Residual Stresses

Shot peening is an effective method of improving fatigue performance of machine parts in the industry by producing a thin surface layer of compressive residual stresses that prevents crack initiation and retards crack growth during service. Nondestructive evaluation of the prevailing compressive residual stresses in the shallow subsurface layer is realized by the critically refracted longitudinal (Lcr) waves. This paper presents experimental data obtained on SMAT (surface mechanical attrition treatment) steel alloy S355 sample. Comparative travel-time shows that there are statistically significant differences in treated and untreated specimen. With knowledge of the acoustoelastic constants which are obtained by a test calibration, the experimental data indicates that compressive residual stresses are distributed near subsurface (hundreds of micron). These stress results show that the Lcr technique is efficient for evaluation of residual stresses after the surface treatment.

Assessment of material damage in a nickel-base superalloy using nonlinear Rayleigh surface waves

2006 ◽  
Vol 99 (12) ◽  
pp. 124913 ◽  
Author(s):  
Jan Herrmann ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Jianmin Qu ◽  
Jerrol W. Littles ◽  
...  
Keyword(s):  
Surface Waves ◽  
Nickel Base Superalloy ◽  
Material Damage ◽  
Rayleigh Surface Waves ◽  
Nickel Base ◽  
Base Superalloy

scholarly journals Rayleigh surface waves propagating in (111) Si substrate decorated with Ni phononic nanostructure

2012 ◽  
Author(s):  
B. Graczykowski ◽  
S. Mielcarek ◽  
A. Trzaskowska ◽  
P. Patoka ◽  
M. Giersig
Keyword(s):  
Surface Waves ◽  
Si Substrate ◽  
Rayleigh Surface Waves

Characterization of fatigue damage in A36 steel specimens using nonlinear rayleigh surface waves

2012 ◽  
Author(s):  
Simon V. Walker ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Jianmin Qu
Keyword(s):  
Surface Waves ◽  
Fatigue Damage ◽  
Rayleigh Surface Waves ◽  
A36 Steel

scholarly journals TRANSFORMATION AND SCATTERING OF SURFACE WAVES ON THE ACOUSTIC LOAD TO ULTRASONIC EVALUATION AND MEASUREMENTS. Part 2. The object to study – solid with ledge

2018 ◽  
Vol 9 (2) ◽  
pp. 142-154 ◽  
Author(s):  
A. R. Baev ◽  
A. L. Mayorov ◽  
M. V. Asadchaya ◽  
G. E. Konovalov ◽  
O. S. Sergeeva
Keyword(s):  
Surface Waves ◽  
Side Surface ◽  
Front Surface ◽  
Technical Application ◽  
Small Aperture ◽  
Transverse Waves ◽  
Longitudinal Modes ◽  
Ultrasonic Evaluation ◽  
Lack Of Information ◽  
Transition Radius

The lack of information about the features of processes of the surface wave's transformation into volume waves and its scattering in metal objects with ledge, slots, grooves and the others is one of the obstacles to improve of the acoustical testing reliability and widening of technical application. The aim of this work was to study of mechanism of acoustical mode's transformation and determination the laws of the fields forming of scatted volume edge wave's in solids with ledge of different geometry and to suggest direction of the study application in area of acoustical testing and measurements.The features of transformation of surface waves into edge transverse and longitudinal wave modes scatted and their fields forming in the volume of the object with ledge vs. its angle of the slope front surface side (0–135°) and a dimensionless transition radius (0–10,2) varied were studied. Theoretical analysis and experimental data shown that in general case the field of the edge transverse waves in the volume of ledge can be imagined as a superposition of the field of edge waves (scatted on ledge) and accompany waves too, radiated simultaneously with the surface waves to radiate. If dimensionless size of the ledge's transition radius lesser than 1 the resulting field of the edge transverse waves is the summary field of two sources. One of them (with small aperture) is localized in the vicinity of the place of intersection of contact surface with ledge's front side surface. As it was found, the second source of the edge transverse waves – the edge head longitudinal waves to appear in the results of transformation of surface waves on the ledge′s radius transition. The structure of the edge acoustic fields including their extremes vs. ledge's angle and its radius transition, position of the surface wave's probe were experimentally studied and theoretically analyzed.Some directions of the results of researches using are the next: а) ultrasonic testing of hard-to-make technological objects in which defects have low sound reflection; b) ultrasonic structure diagnostics of solid (specimens) set far from the ultrasonic by using edge volume transverse and longitudinal modes; c) creation of new ultrasonic arrangements to sound and to receive transverse waves of different polarization.

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