A Spatial Resolution of Residual Stress Measurements Using the Deep Hole Drilling Technique

2010 ◽  
Author(s):  
Alexandros Skouras ◽  
Martyn J. Pavier ◽  
Anton Shterenlikht
Keyword(s):  
Residual Stress ◽  
Spatial Distribution ◽  
Element Model ◽  
High Accuracy ◽  
Metal Plate ◽  
Hole Drilling ◽  
Two Dimensional ◽  
Deep Hole ◽  
Drilling Technique ◽  
Dimensional Finite Element

This paper describes a study of the ability of the DHD technique to measure the spatial distribution of residual stresses. A two dimensional finite element model of a metal plate has been generated together with a representative state of residual stress. A simulation of the DHD technique is then carried out to provide a series of measurements of the residual stress which can be compared with the known residual stress. This simulation allows the effect of the varying trepan diameters on the accuracy of the DHD technique to be explored. The results of the simulation show that the DHD technique can be used to measure residual stress with a high accuracy, but the increase in the trepan diameter introduce some errors. Suggestions and techniques for reducing these errors are presented.

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

Improvement of Residual Stress Determination by Deep Hole Drilling Considering Plastic Deformation

2012 ◽  
Author(s):  
Masahito Mochizuki ◽  
Houichi Kitano ◽  
Shigetaka Okano
Keyword(s):  
Residual Stresses ◽  
High Accuracy ◽  
Fe Analysis ◽  
Stress Fields ◽  
Hole Drilling ◽  
Accuracy Evaluation ◽  
Deep Hole ◽  
Stress Determination ◽  
Deep Hole Drilling ◽  
Drilling Technique

The deep hole drilling technique (DHD) has received much attention in recent years as a method for measuring through-thickness residual stresses. However, the accuracy of the measurements of residual stresses by the DHD technique is affected by the deformation produced in the DHD process. In this study, the effects of the deformation are investigated in detail by FE analysis. Then, a new procedure for high accuracy evaluation of residual stresses by the DHD technique is discussed. In addition, the procedure are applied to the evaluation of some inner stress fields.

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