MISALIGNMENT CONTROL IN PARALLEL HOLE DRILLING TECHNIQUE OF STRESS MEASUREMENT IN ROCK MASS

2021 ◽  
Vol 8 (2) ◽  
pp. 20-24
Author(s):  
V. D. Baryshnikov ◽  
D. V. Baryshnikov ◽  
D. A. Utev
Keyword(s):  
Rock Mass ◽  
Stress Measurement ◽  
Hole Drilling ◽  
Drilling Technique ◽  
Parallel Hole

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.

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.

scholarly journals Residual stress measurement on 3-D printed blocks of Ti-6Al-4V using incremental hole drilling technique

2019 ◽  
Vol 14 ◽  
pp. 337-344
Author(s):  
Digendranath Swain ◽  
A. Sharma ◽  
S.K. Selvan ◽  
B.P. Thomas ◽  
Govind ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Incremental Hole Drilling ◽  
Drilling Technique

scholarly journals Residual Stress Measurement Using the Hole Drilling Technique on Components outside the ASTM E837 Standard

2014 ◽  
Vol 996 ◽  
pp. 301-306 ◽  
Author(s):  
Yann Serra ◽  
Xavier Ficquet ◽  
Ed Kingston
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Measurement Technique ◽  
Stress Measurement ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Drilling Technique ◽  
Astm E837

The hole drilling technique is probably the most widely used residual stress measurement technique. The ASTM E837 standard covers hole drilling measurements for thin and thick specimens. VEQTER have encountered several cases when the specimen was between the thick and thin specification. In order to gain a greater understanding of the sensitivity of the analyses and accurately measure the residual stresses using the hole drilling technique within intermediate thickness specimens and within thin specimens containing non-uniform residual stresses a study was performed.

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