Novel Applications of the Deep-Hole Drilling Technique for Measuring Through-Thickness Residual Stress Distributions

2009 ◽  
pp. 146-146-10
Author(s):  
Edward J. Kingston ◽  
Danut Stefanescu ◽  
Amir H. Mahmoudi ◽  
Chris E. Truman ◽  
David J. Smith
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Stress Distributions ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Drilling Technique ◽  
Novel Applications

Novel Applications of the Deep-Hole Drilling Technique for Measuring Through-Thickness Residual Stress Distributions

2006 ◽  
Vol 3 (4) ◽  
pp. 12568 ◽  
Author(s):  
EJ Kingston ◽  
D Stefanescu ◽  
AH Mahmoudi ◽  
CE Truman ◽  
DJ Smith
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Stress Distributions ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Drilling Technique ◽  
Novel Applications

Effect of Gauge Volume on the Residual Stress Measurement Using Deep Hole Drilling Technique

2010 ◽  
Author(s):  
Amir H. Mahmoudi ◽  
David J. Smith ◽  
Chris E. Truman ◽  
Martyn J. Pavier
Keyword(s):  
Residual Stress ◽  
Material Removal ◽  
Stress Measurement ◽  
Measurement Techniques ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Gauge Volume ◽  
Drilling Technique

Accurate evaluation of residual stress is essential if is to be taken into account in structural integrity assessments. For thick components, many non-destructive residual stress measurement techniques cannot be used since they are unable to measure the stresses deep within the component. Measurement techniques which involve mechanical strain relief through material removal are the only alternative. Recently, it has been found that these techniques may fail to measure the stresses correctly when highly triaxial stresses are present because plastic redistribution can occur when the material removal is carried out. The Deep Hole Drilling technique is a very powerful method to measure the stresses within very thick engineering components. However, it can suffer from high levels of plasticity and lead to inaccurate results. It is shown in the present research that the effect of plasticity on the measured stresses can be eliminated. In the present work, the effect of gauge volume on the plasticity effect is investigated.

Analysis and Optimization of the Deep-Hole Drilling Technique in Measuring Complex Residual Stress

2017 ◽  
Author(s):  
Gang Zheng ◽  
Sayeed Hossain ◽  
Feng Shen ◽  
Chris Truman
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Longitudinal Axis ◽  
Hole Drilling ◽  
Internal Diameter ◽  
Deep Hole ◽  
Element Analysis ◽  
Deep Hole Drilling ◽  
Drilling Technique ◽  
Technique Comparison

The aim of the present study was to utilize a complex residual stress generated within a welded circular disc to further investigate the standard deep-hole drilling (DHD) technique and the newly developed over-coring deep-hole drilling (oDHD) technique in accurately measuring residual stresses well over yield stress. Finite Element Analysis (FEA) was used to optimize and extend the deep-hole drilling technique and improve its accuracy. The standard DHD procedure involves 4 steps. (1) A reference hole is gun-drilled through the component. (2) The internal diameter of the reference hole is measured at different angular positions through the depth of the component. (3) A cylindrical section with the reference hole as its longitudinal axis is trepanned free from the component. (4) Finally, the relaxed internal diameter is re-measured at the same angular positions and the same depths. The drilling, trepanning procedures and the parameters of the deep-hole drilling technique were all studied in detail to optimize the technique. Comparison is made between the FEA predicted residual stress in the weld, the measurements and the reconstructed residual stresses of the measurements. The close correlations confirmed the suitability of new modifications made in the deep-hole drilling technique to account for plasticity when measuring near yield residual stresses present in a component.

Evaluating Uncertainty in Residual Stress Measured Using the Deep-Hole Drilling Technique

Strain ◽  
2011 ◽  
Vol 47 (1) ◽  
pp. 62-74 ◽  
Author(s):  
D. M. Goudar ◽  
C. E. Truman ◽  
D. J. Smith
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Drilling Technique

scholarly journals A study for high accuracy measurement of residual stress by deep hole drilling technique

2012 ◽  
Vol 379 ◽  
pp. 012049 ◽  
Author(s):  
Houichi Kitano ◽  
Shigetaka Okano ◽  
Masahito Mochizuki
Keyword(s):  
Residual Stress ◽  
High Accuracy ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Accuracy Measurement ◽  
Drilling Technique ◽  
High Accuracy Measurement

Uncertainties in Triaxial Residual Stress Measurements

2011 ◽  
Vol 681 ◽  
pp. 498-503 ◽  
Author(s):  
D.M. Goudar ◽  
M.S. Hossain ◽  
Christopher E. Truman ◽  
Ed J. Kingston ◽  
David John Smith
Keyword(s):  
Residual Stress ◽  
Error Analysis ◽  
Cold Water ◽  
Stress Measurement ◽  
Measurement Techniques ◽  
Mechanical Strain ◽  
Hole Drilling ◽  
Stress Distributions ◽  
Deep Hole ◽  
Deep Hole Drilling

Residual stress measurement techniques using mechanical strain relaxation depend on a number of physical quantities and are therefore sensitive to errors associated with the measured data. The resulting stress uncertainties can easily become significant and compromise the usefulness of the results or lead to misinterpretation of the behaviour of the residual stress distributions. It is therefore essential to develop an error analysis procedure for the measurements undertaken. Error analysis procedures for the deep hole drilling (DHD) method are developed to consider triaxial residual stresses. A modified deep hole drilling method, called the incremental deep-hole drilling (iDHD), was applied to measure the near yield residual stress distributions in a cold water quenched aluminium 7010 alloy forged block. The experimental results are used to illustrate the errors.

Measurement of Internal Strains in Graphite Using the Deep Hole Drilling Technique

2008 ◽  
Author(s):  
Soheil Nakhodchi ◽  
Peter E. J. Flewitt ◽  
Chris Truman ◽  
David J. Smith
Keyword(s):  
Volume Fraction ◽  
Stress Measurement ◽  
Reactor Core ◽  
Hole Drilling ◽  
Stress Distributions ◽  
Deep Hole ◽  
Stress Strain ◽  
Deep Hole Drilling ◽  
Drilling Technique ◽  
Internal Strains

Currently, measurement of internal strains deep inside graphite is extremely difficult. As a consequence there is a need to assess the ability of a deep-hole drilling (DHD) method to measure internal strains in reactor core graphite and explore the potential for in-situ measurement. DHD technique is a semi-destructive method for measurement of the through thickness residual stresses. The technique previously has been applied successfully to metallic and composite materials. In this paper, the method for stress measurement in graphite is examined particularly when a significant volume fraction of porosity is present. Two types of graphite were used, PGA and PG25 filter graphite. In PGA graphite the Young’s modulus of elasticity was orientation dependent. As a consequence samples were cut from blocks in two directions. PG25 filter graphite is a surrogate for service exposed material. Known loads were applied to graphite beam samples and the DHD method was used to measure the stress/strain profile through the material. The results were compared with the strain data obtained from strain gauges bonded to the samples. Overall, there was an excellent agreement between the DHD measured stress/strain and applied stress. It is shown that deep-hole drilling technique can measure linear stress distributions in graphite.

The effect of plasticity on the ability of the deep hole drilling technique to measure axisymmetric residual stress

2011 ◽  
Vol 53 (11) ◽  
pp. 978-988 ◽  
Author(s):  
A.H. Mahmoudi ◽  
C.E. Truman ◽  
D.J. Smith ◽  
M.J. Pavier
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Drilling Technique

scholarly journals Measurement of Through–Thickness Residual Stress in Thick–Section Weldment by Advanced Deep Hole Drilling Technique

2021 ◽  
Vol 70 (4) ◽  
pp. 315-322
Author(s):  
Masahito MOCHIZUKI ◽  
Shigetaka OKANO ◽  
Houichi KITANO
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Thick Section ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Drilling Technique
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