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Experimental Mechanics

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29.08.2018

Non-Destructive Characterization of Subsurface Residual Stress Fields and Correlation with Microstructural Conditions in a Shot-Peened Inconel Component

verfasst von: J.-S. Park, K. Yildizli, E. Demir, P.R. Dawson, M.P. Miller

Erschienen in: Experimental Mechanics | Ausgabe 9/2018

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Abstract

Shot-peening is an important surface treatment used in a preventative way to guard against fatigue failures. The residual stress state imparted by shot-peening deters the formation and propagation of surface cracks. In this paper, we describe the measurement of residual stresses in an Inconel, IN100, sample using lattice strains measured using High Energy X-ray Diffraction (HEXD) and a Bi-Scale Optimization Method (BSOM). HEXD enabled rapid, non-destructive lattice strain measurements over a large region of the sample. Subsurface strains were obtained using a conical slit setup. The BSOM utilizes a macroscale representation of the sample and a spherical harmonic-based crystal scale representation of crystal orientation space at each experimental point (diffraction volume). A roughly biaxial stress state was predicted with a von Mises equivalent stress between 300 MPa and 400 MPa near the surface. The layer of material with high residual stress induced by shot-peening was found to be approximately 1 mm thick. Diffraction peak width, EBSD, and microhardness measurements were also made on the same sample, which rendered more qualitative measures of the plasticity-related effects of the shot-peening induced residual stress field. All of these measurements show a dimishing shot-peening plasticity with the increasing depth.

Vorheriger Artikel Assessment of Primary Slice Release Residual Stress Mapping in a Range of Specimen Types

Nächster Artikel High-Resolution Deformation Mapping Across Large Fields of View Using Scanning Electron Microscopy and Digital Image Correlation

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These challenges are not unique to HEXD measurements.

Notation conventions adopted here are: scalars are in plain italic font; vectors are in bold-face italic font; second order tensors are in bold faced sans serif font; and, fourth order tensors are in bold faced calligraphic font. Components of vectors or tensors are plain fonts of the same type. Contractions between vectors and tensors are designated by a (⋅); contractions over two indices are indicated by (:).

The “conical” aspect of the slits comes from the fact that they are constructed at an angle consistent with the trajectory of the diffracted beams – as shown in Fig. 2.

These penalty parameters were adjusted until the macroscopic boundary conditions were well-satisfied. In our HEXD measurements, the strain resolution was on the order of \(1 \times 10^{-4}\) which translates to approximately 20 MPa in stress resolution. Therefore, the penalty parameters were adjusted until the boundary conditions and equilibrium were satisfied within 20 MPa overall while keeping the difference between the computed lattice strains and the measured lattice strains below \(1 \times 10^{-4}\).

In our case, lsqlin function in Matlab was used as the solver.

The peak widths did not show any significant trends with respect to \(\boldsymbol {q}\).

MAD is defined as the angular misfit between the measured and simulated Kikuchi patterns. Band contrast and band slope both describe the quality of measured Kikuchi pattern; band contrast uses the intensity of the Kikuchi patterns and band slope uses the gradient of the intensity in the Kikuchi patterns as their measures. Details of their definitions are available in [50, 51] (http://ebsdimage.org/documentation/reference/qualitymetrics.html).

Currently at Deutsches Elektronen-Synchrotron, Germany.

Currently at Nutonian Inc., USA.

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Titel: Non-Destructive Characterization of Subsurface Residual Stress Fields and Correlation with Microstructural Conditions in a Shot-Peened Inconel Component
verfasst von: J.-S. Park
K. Yildizli
E. Demir
P.R. Dawson
M.P. Miller
Publikationsdatum: 29.08.2018
Verlag: Springer US
Erschienen in: Experimental Mechanics / Ausgabe 9/2018
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-018-0418-z

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