Experimental study of nonlinear Rayleigh wave propagation in shot-peened aluminum plates—Feasibility of measuring residual stress

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

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Development of an acoustic microscope to measure residual stress via ultrasonic Rayleigh wave velocity measurements

10.31274/rtd-180813-11915 ◽

1995 ◽

Author(s):

Jane Carol Johnson

Keyword(s):

Residual Stress ◽

Rayleigh Wave ◽

Wave Velocity ◽

Velocity Measurements ◽

Acoustic Microscope ◽

Rayleigh Wave Velocity

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Experimental study of blasting wave propagation in jointed rock mass and vibration reduction effect of barrier holes

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/570/4/042026 ◽

2020 ◽

Vol 570 ◽

pp. 042026

Author(s):

Yashi Li ◽

Rui Zhao ◽

Jianbo Zhu

Keyword(s):

Experimental Study ◽

Wave Propagation ◽

Rock Mass ◽

Vibration Reduction ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Reduction Effect ◽

Blasting Wave

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Third Order Elastic Constants and Rayleigh Wave Dispersion of Shot Peened Aero-Engine Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.768-769.201 ◽

2013 ◽

Vol 768-769 ◽

pp. 201-208 ◽

Cited By ~ 3

Author(s):

Marek Rjelka ◽

Martin Barth ◽

Sven Reinert ◽

Bernd Koehler ◽

Joachim Bamberg ◽

...

Keyword(s):

Residual Stress ◽

Rayleigh Wave ◽

Elastic Constants ◽

Cold Work ◽

High Strength ◽

Wave Dispersion ◽

Third Order ◽

Third Order Elastic Constants ◽

Aero Engine ◽

Rayleigh Wave Dispersion

Aero-engine components exposed to high mechanical stresses are made of high-strength alloys and additionally, they are surface treated by shot peening. This process introduces compressive residual stress into the material making it less sensitive to stress corrosion cracking and fatigue and therefore benefits the components performance and lifetime. Moreover cold work is induced in an amount depending on the peening parameters. To approximate the remaining lifetime, a quantitative, non-destructive method for stress assessment is required. It was shown that surface treatment of such alloys can be characterized by broadband Rayleigh wave dispersion measurements. However, the relative contributions of residual stress and cold work, respectively, remained an open point. This paper presents the determination of third order elastic constants (TOEC) for IN718 and Ti6246, providing, together with a model for the inversion of dispersion data, a quantitative access to the acoustoelastic effect. Finally, some measurements of differently treated samples are given.

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