A contact size-independent approach to the estimation of biaxial residual stresses by Knoop indentation

Rickhey, Felix; Lee, Jin Haeng; Lee, Hyungyil

doi:10.1016/j.matdes.2015.06.119

Cited by 36 publications

(4 citation statements)

References 31 publications

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“…Further, compressive RS do not cause an evident change in ρ (i.e., ρ / ρ o ≈ 1), but ρ decreases with increasing tensile RS, indicating that the influence of tensile RS on radial-median cracking is fundamentally different from that of compressive RS. Note that a fundamental difference between tensile and compressive RS has also been observed in indentation of ductile materials (e.g., Sines and Carlson [ 49 ]; Suresh and Giannakopoulos [ 50 ]; Rickhey et al [ 11 ]).…”

Section: Fe Results and Observations For Equibiaxial Rsmentioning

confidence: 94%

“…A mechanical NDT, indentation, is a convenient, inexpensive and quick means for RS estimation and can be applied to ductile [ 10 , 11 ], as well as brittle materials [ 12 ]. Generally, RS support (tensile RS) or work against (compressive RS) the penetration of the material by the indenter, resulting in a downward (tensile RS) or upward shift (compressive RS) of the characteristic indentation force-indentation depth curve.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Indentation Cracking-Based Approaches for Residual Stress Evaluation

2017

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Vickers indentation fracture can be used to estimate equibiaxial residual stresses (RS) in brittle materials. Previous, conceptually-equal, analytical models were established on the assumptions that (i) the crack be of a semi-circular shape and (ii) that the shape not be affected by RS. A generalized analytical model that accounts for the crack shape and its change is presented. To assess these analytical models and to gain detailed insight into the crack evolution, an extended finite element (XFE) model is established. XFE analysis results show that the crack shape is generally not semi-circular and affected by RS and that tensile and compressive RS have different effects on the crack evolution. Parameter studies are performed to calibrate the generalized analytical model. Comparison of the results calculated by the analytical models with XFE results reveals the inaccuracy inherent in the previous analytical models, namely the neglect of (the change of) the crack aspect-ratio, in particular for tensile RS. Previous models should therefore be treated with caution and, if at all, used only for compressive RS. The generalized model, on the other hand, gives a more accurate description of the RS, but requires the crack depth.

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Section: Fe Results and Observations For Equibiaxial Rsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Investigation on Indentation Cracking-Based Approaches for Residual Stress Evaluation

2017

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“…The development of indentation methods has mainly gone through two stages. The first stage is focusing on the measurement of equibiaxial residual stresses, which is relatively straightforward because it is not necessary to determine the directionality of principal residual stresses [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. The second stage is to strive for evaluating non-equibiaxial residual stresses, which is more complicated because both the magnitude and directionality of principal residual stresses must be determined [28][29][30][31][32][33].…”

mentioning

confidence: 99%

“…Among the indentation methods for non-equibiaxial residual stresses evaluation, two categories of indenters, i.e., two-fold symmetric indenters (Knoop and wedge indenter) and spherical indenter, are often used. For indentation tests on the same stressed sample with two-fold symmetric indenter, Han et al [34], Choi et al [35], and Rickhey et al [23] found that the load-depth curve changed with the rotation of the indenter, meaning the load-depth curve was sensitive to the orientation of the Knoop indenter with respect to the principal stress directions. Based on this phenomenon, Kim et al [31,32] used the load differences between stressed and unstressed samples to evaluate the magnitude and direction of principal residual stresses by carrying out four Knoop indentations at 45 • rotated angles.…”

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confidence: 99%

Evaluation of Non-Equibiaxial Residual Stresses in Metallic Materials via Instrumented Spherical Indentation

Peng

Chen

et al. 2020

Metals

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Residual stresses, existed in engineering structures, could significantly influence the mechanical properties of structures. Accurate and non-destructive evaluation of the non-equibiaxial residual stresses in these structures is of great value for predicting their mechanical performance. In this work, investigating the mechanical behaviors of instrumented spherical indentation on stressed samples revealed that non-equibiaxial residual stresses could shift the load-depth curve upwards or downwards and cause the residual indentation imprint to be an elliptical one. Through theoretical, experimental, and finite element (FE) analyses, two characteristic indentation parameters, i.e., the relative change in loading curvature and the asymmetry factor of the residual indentation imprint, were found to have optimal sensitivity to residual stresses at a depth of 0.01R (R is the radius of spherical indenter). With the aid of dimensional analysis and FE simulations, non-equibiaxial residual stresses were quantitatively correlated with these two characteristic indentation parameters. The spherical indentation method was then proposed to evaluate non-equibiaxial residual stress based on these two correlations. Applications were illustrated on metallic samples (AA 7075-T6 and AA 2014-T6) with various introduced stresses. Both the numerical and experimental verifications demonstrated that the proposed method could evaluate non-equibiaxial surface residual stresses with reasonable accuracy.

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Effects of Sample Tilt on Vickers Indentation Hardness

Liu

Zhu

Dong

et al. 2017

Advanced Mechanical Science and Technology for the Industrial Revolution 4.0

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A contact size-independent approach to the estimation of biaxial residual stresses by Knoop indentation

Cited by 36 publications

References 31 publications

Investigation on Indentation Cracking-Based Approaches for Residual Stress Evaluation

Investigation on Indentation Cracking-Based Approaches for Residual Stress Evaluation

Evaluation of Non-Equibiaxial Residual Stresses in Metallic Materials via Instrumented Spherical Indentation

Effects of Sample Tilt on Vickers Indentation Hardness

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