Hole-Drilling Residual Stress Measurements at 75: Origins, Advances, Opportunities

Schajer, G. S.

doi:10.1007/s11340-009-9285-y

Cited by 72 publications

(40 citation statements)

References 49 publications

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“…There are three main error sources: introduction of machining stresses (adding to the residual stresses to be measured), non-cylindrical hole shape, and eccentricity but so far it is the only method for measurement of residual stresses that is accepted as an ASTM standard [19]. In general, the magnitude of this additional induced stress depends on the drilling method employed and working parameters as well.…”

Section: Hole-drilling Techniquementioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

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Residual stresses occur in many manufactured structures and components. Large number of investigations have been carried out to study this phenomenon and its effect on the mechanical characteristics of these components.Over the years, different methods have been developed to measure residual stress for different types of components in order to obtain reliable assessment. The various specific methods have evolved over several decades and their practical applications have greatly benefited from the development of complementary technologies, notably in material cutting, full-field deformation measurement techniques, numerical methods and computing power. These complementary technologies have stimulated advances not only in measurement accuracy and reliability, but also in range of application; much greater detail in residual stresses measurement is now available. This paper aims to classify the different residual stresses measurement methods and to provide an overview of some of the recent advances in this area to help researchers on selecting their techniques among destructive, semi destructive and non destructive techniques depends on their application and the availabilities of those techniques. For each method scope, physical limitation, advantages and disadvantages are summarized. In the end this paper indicates some promising directions for future developments.

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Section: Hole-drilling Techniquementioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

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“…Therefore high speed drills or abrasive air jets are used. Hole-drilling is the only method so far accepted as an ASTM standard [7].…”

Section: Hole-drillingmentioning

confidence: 99%

Residual Stresses in Cast Iron Components - Simulated Results Verified by Experimental Measurements

Elmquist

Brehmer

Schmidt

et al. 2018

MSF

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Abstract. The aim of this work was to investigate how accurately residual stresses can be simulated in a cast component. The reason why this is important is that a simulation that also considers residual stresses can be used to design cast components more weight-and cost-efficient. The verification was done by comparing simulated results with physical measurements on cylinders made of ductile iron. The measurements were performed with two methods, sectioning and holedrilling. These methods were applied on both as-cast and machined cylinders. The simulations were based on process data from casting trials and material data from the simulation software database. The material data for the heat conductivity of the molding sand was fitted to get a good conformity between measured and simulated temperatures. This was done to ensure that the residual stress simulation used a relevant temperature history. It turned out that the simulation was in good agreement with results from the sectioning measurements of the axial stress while results from the hole-drilling measurements were contradictive. These results were contradictive for both as-cast and machined cylinders. It can therefore be concluded that residual stresses measured by the sectioning method resulted in good conformity with the simulated σ z stresses. It was also concluded that the feeders, acting as extra heat sources, affects residual stresses locally and contributes to differences in stresses beneath the feeders, compared to corresponding areas between the feeders. It was also found that the resolution of the mesh needs to be finer to take into account changes in the stresses with increments in depth when using the hole drilling method.

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“…Therefore, the measured relaxation strain induced by further incremental drillings can be derived from the cumulative modification of stress due to the previous removals of the upper increments. The ÔtrueÕ residual stress profile resulting from a total sequence of j increments can be calculated by implementing an integral method (Ref 8,9). This method written in a discrete form needs a numerical calibration of the strain/stress relationship in each incremental layer after each drilling step, as expressed in Eq 5.…”

Section: Residual Stress Analysismentioning

confidence: 99%

“…The purpose was to assess the crack initiation and propagation in cases of a ÔsevereÕ drilling condition for various bond coats. From these experiments, we then focussed on the residual stress analysis of these various TBCs before and after laser drilling around the machined area using the incremental hole-drilling method involving conventional mechanical milling (Ref 8,9). The goal was to bring out a discussion about the role of residual stresses generated during the deposition process and further modified by the laser-drilling process on crack generation.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats

et al. 2014

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International audienceThe gas turbine combustion chamber of aero-engines requires a thermal barrier coating (TBC) by thermal spraying. Further heat protection is achieved by laser drilling of cooling holes. The residual stresses play an important role in the mechanical behaviour of TBC. It could also affect the TBC response to delamination during laser drilling. In this work, studies of the cracking behaviour after laser drilling and residual stress distribution have been achieved for different bond coats by plasma spray or cold spray. From interface crack length measured pulse-by-pulse after laser percussion drilling at 20° angle, the role of the various bond coats on crack initiation and propagation are investigated. It is shown that the bond coat drastically influences the cracking behaviour. The residual stresses profiles were also determined by the incremental hole-drilling method involving speckle interferometry. An original method was also developed to measure the residual stress profiles around a pre-drilled zone with a laser beam at 90°. The results are discussed to highlight the influence of TBCs interfaces on the resulting residual stresses distribution before laser drilling, and also to investigate the modification around the hole after laser drilling. It is shown that laser drilling could affect the residual stress state

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Hole-Drilling Residual Stress Measurements at 75: Origins, Advances, Opportunities

Cited by 72 publications

References 49 publications

Methods of measuring residual stresses in components

Methods of measuring residual stresses in components

Residual Stresses in Cast Iron Components - Simulated Results Verified by Experimental Measurements

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats

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