Sub‐Surface Plastic and Elastic Strain Fields and Fatigue Performance Of Drilled Titanium Plates

Violatos, I.; Thomas, Meurig; Castle, James; Wynne, B.P.

doi:10.1002/9781119296126.ch176

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…The work presented here builds on previous work 14 of developing and refining a micro-slotting residual stress measurement procedure that can be applied for measuring residual hoop stresses around drilled holes in Ti-6Al-4V. For this study, the authors chose to use a homogeneous stress field assumption in combination with a short slot geometry of 5 × 1 × 7 µm 3 in order to decrease the required spacing between the micro-slots and reduce the local measurement area over which the residual stress is averaged.…”

Section: Introductionmentioning

confidence: 88%

“…9,[11][12][13] Shorter slots result in more complex displacement fields and require finite element analysis (FEA) for interpolation of the original stress state in the measurement regions. 14 Recent improvements in the micro-slotting approach have allowed for more complex residual stress evaluation, including residual stress variations with slot depth 15 and along the length of the slot. 12 , 16 The assumption of a homogeneous stress state simplifies the micro-slotting approach by allowing the residual stress to be averaged over the local measurement area and may be sufficient for some experiments.…”

Section: Introductionmentioning

confidence: 99%

“…9,11–13 Shorter slots result in more complex displacement fields and require finite element analysis (FEA) for interpolation of the original stress state in the measurement regions. 14…”

Section: Introductionmentioning

confidence: 99%

“…Due to the micron-sized sampling volume and localized stress relief, the micro-slotting method has been successfully used to obtain spatially resolved residual stress profiles below shot peened surfaces 12 and around drilled holes. 14 Sequential milling 17 is a common approach for acquiring such data and involves milling micro-scale geometries at regular intervals in order to capture the residual stress gradient. One limitation of this approach is the spacing between subsequent measurements.…”

Section: Introductionmentioning

confidence: 99%

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Micro-slotting technique for reliable measurement of sub-surface residual stress in Ti-6Al-4V

Burns

Newkirk

Castle

2018

The Journal of Strain Analysis for Engineering Design

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Micro-slotting, a relaxation residual stress measurement technique, has recently been shown to be an effective method for measuring local residual stresses in a variety of materials. The micro-slotting method relies on a scanning electron microscope-focused ion beam system for milling and imaging, digital image correlation software to track displacements due to residual stress relaxation after milling, and finite element analysis for displacement-stress correlation and calculation of the original stress state in the imaged region. The high spatial resolution of the micro-slotting method makes it a promising technique for obtaining near-surface residual stress data in Ti-6Al-4V components for input into fatigue life models and crack growth simulations. However, use of the micro-slotting method on this alloy has yet to be evaluated against more established measurement techniques. In this study, spatially resolved sub-surface residual stress measurements were obtained on shot peened and low-stress surface-machined Ti-6Al-4V planar coupons using the microslotting method and were compared to measurements obtained using the conventional X-ray diffraction depth profiling technique. The sub-surface measurements were in good agreement for the shot peened sample. Observed differences in the measured near-surface residual stresses on the surface-machined sample were attributed to the larger measurement volume of the X-ray diffraction method, suggesting that the micron-sized measurement volume of the micro-slotting method may be more suitable for capturing shallow stress profiles and steep stress gradients. Prior to performing the micro-slotting measurements, finite element modeled displacements were used to verify the measurement procedure and to address uncertainties in the milled slot geometries. The results of this study demonstrated the validity of the micro-slotting procedure and established the technique as a reliable method for measuring sub-surface residual stresses in Ti-6Al-4V.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

“…9,11–13 Shorter slots result in more complex displacement fields and require finite element analysis (FEA) for interpolation of the original stress state in the measurement regions. 14…”

Section: Introductionmentioning

confidence: 99%