Local Stress-Ratio Criterion for Incremental Hole-Drilling Measurements of Shot-Peening Stresses

[+] Author and Article Information
J. P. Nobre

Mechanical Engineering Department,  University of Coimbra, Polo II-Pinhal de Marrocos, P-3030 Coimbra, Portugaljoao.nobre@dem.uc.pt

A. M. Dias

Mechanical Engineering Department,  University of Coimbra, Polo II-Pinhal de Marrocos, P-3030 Coimbra, Portugal

J. Gibmeier

Institute of Materials Engineering,  University of Kassel, Moenchebergstr. 3, D-34125 Kassel, Germany

M. Kornmeier

 European Patent Office, Nymphenburger Str., 21d, D-80335 München, Germany

J. Eng. Mater. Technol 128(2), 193-201 (Jun 07, 2005) (9 pages) doi:10.1115/1.2172623 History: Received September 01, 2004; Revised June 07, 2005

A criterion to evaluate the influence of the so-called plasticity effect on the final outcome of the incremental hole-drilling technique (IHD), for measuring residual stresses induced by mechanical surface treatments, is proposed here. In practice, it is currently accepted that residual stresses can be accurately determined by IHD if the residual stress level does not exceed about 60% of the material’s yield strength. However, this criterion is not appropriate when IHD is used to measure residual stresses in work-hardened surface layers, since the yield strength of these layers is very difficult to determine. The proposed criterion takes into account the strain-hardening effect and the local yield strength of work-hardened surface layers, using the concept of normalized hardness variation. The criterion was validated experimentally and numerically for shot-peening residual stress measurements.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

In-depth shot-peening residual stress profiles, determined by XRD and IHD (integral method). From left to right, respectively: AISI (420), AISI 1045, AISI 3415, and AISI 4337.

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Figure 2

Hardness (HV0.1) and x-ray diffraction peak width variation along the shot-peened layers of steels AISI (420) and AISI 3415 (left). Corresponding estimate of the in-depth variation of yield strength (right).

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Figure 3

Apparent and estimated real local ratio of residual stress to yield strength, R(z) (primary axis), and residual stress profiles obtained by XRD (secondary axis) in the case of shot-peened steels. AISI 1045 (left), AISI (420) (center), and 3415 (right).

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Figure 4

In-depth variation of relative error on radial strain relaxation, for different stress ratios (R)—left. Plastic strain field around the hole for R=80% and R=95% (1.8mm diameter, 0.5mm depth)—right. Equi-biaxial uniform compressive residual stress of −380MPa.

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Figure 5

In-depth strain relaxation overestimation due to the plasticity effect in the case of AISI (420) (left) and 3415 (right) steel

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Figure 6

Comparison between experimental residual stress (IHD-IM) and numerical (FEM-IM) profiles in the case of the AISI (420) (left) and AISI 3415 (right) shot-peened specimens. XRD versus FEM residual stress profiles are also shown.



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