Universal Calibration Constants for Strain Gauge Hole-Drilling Residual Stress Measurements

2021 ◽  
Author(s):  
G. S. Schajer
Keyword(s):  
Residual Stress ◽  
Strain Gauge ◽  
Hole Drilling ◽  
Stress Measurements ◽  
Universal Calibration

Advances in Hole-Drilling Residual Stress Measurements

2009 ◽  
Vol 50 (2) ◽  
pp. 159-168 ◽  
Author(s):  
G. S. Schajer
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Stress Measurements

Influence of Drilling Parameters on the Accuracy of Hole-drilling Residual Stress Measurements

2014 ◽  
Vol 54 (9) ◽  
pp. 1537-1543 ◽  
Author(s):  
M. Steinzig ◽  
D. Upshaw ◽  
J. Rasty
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Stress Measurements ◽  
Drilling Parameters

scholarly journals Comparison of Residual Stress Measurements Conducted by X-ray Stress Analysis and Incremental Hole Drilling Method

2020 ◽  
Vol 29 (6) ◽  
pp. 1218-1228
Author(s):  
K. Bobzin ◽  
W. Wietheger ◽  
M. A. Knoch ◽  
A. Schacht ◽  
U. Reisgen ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Hole Drilling ◽  
X Ray ◽  
Stress Measurements ◽  
Hole Drilling Method ◽  
Incremental Hole Drilling ◽  
Drilling Method

Simulation of Strain Gauge Thermal Effects During Residual Stress Hole Drilling Measurements

2005 ◽  
Vol 40 (7) ◽  
pp. 611-619 ◽  
Author(s):  
P Litoš ◽  
M Švantner ◽  
M Honner
Keyword(s):  
Residual Stress ◽  
Heat Flux ◽  
Strain Gauge ◽  
Computer Modelling ◽  
Thermal Strain ◽  
Sample Surface ◽  
Hole Drilling ◽  
Drilling Process ◽  
Drilling Tool ◽  
Thermomechanical Process

The hole drilling residual stress measuring method is based on drilling a small hole in a material sample and measuring the strain relieved in the hole vicinity by a special strain gauge rosette. The temperature and thermal strain induced by the drilling process can cause significant errors in the relieved strain measurement. The paper deals with computer simulation of the thermomechanical process in the sample during drilling. The first part is devoted to the evaluation of heat flux from the drilling tool to the drilled material using the sample surface temperature measured by thermography. The second part deals with determination of real strain and strain gauge thermal output (apparent strain) at the strain gauge location during and after drilling. The paper describes the computer modelling technique for solving an indirect thermal problem of drilling heat flux determination and a direct thermomechanical problem for a set of the process alternatives. Comparisons of simulated and experimentally determined temperatures and strains are presented.

scholarly journals Considerations on the choice of experimental parameters in residual stress measurements by hole-drilling and ESPI

2014 ◽  
Vol 8 (30) ◽  
pp. 211-219 ◽  
Author(s):  
C. Barile ◽  
C. Casavola ◽  
G. Pappalettera ◽  
C. Pappalettere
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Stress Measurements ◽  
Experimental Parameters

Measurement of Residual Stresses in a Nozzle-to-Cylinder Weld After Thermal Ageing at 550°C

2007 ◽  
Author(s):  
S. Hossain ◽  
C. E. Truman ◽  
D. J. Smith ◽  
P. J. Bouchard
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Hoop Stress ◽  
Thermal Ageing ◽  
Hole Drilling ◽  
Stress Profile ◽  
Aged Condition ◽  
Steel Component ◽  
Stress Measurements ◽  
Test Treatment

This paper presents results from a programme of experimental measurements of residual stresses in a type 316H stainless steel component consisting of a nozzle welded to a cylinder. The residual stresses were measured using the deep-hole drilling (DHD) technique. The welded component had been thermally aged in a furnace at 550°C for 19,644 hours prior to the residual stress measurements. Measurements were obtained in the through-thickness section of the component at two locations: (i) in the cylinder heat affected zone (HAZ) at the flank of the nozzle-to-cylinder weld intersection and (ii) in the cylinder HAZ near the crown of the nozzle-to-cylinder weld intersection. The stress measurements made after the furnace heat soak treatment are compared with the earlier as-welded stress measurements. In comparison with as-welded residual stress measurements on the same component and with residual stresses in a service-aged (55,000 hours at 525°C) component, it was evident that the thermal soak test treatment had significantly relaxed the weld residual stresses. In particular the soak test hoop stress profile was almost identical to the service-aged condition, whereas the transverse stress distribution had only been partially relaxed by the thermal soak test.

scholarly journals The Application of Digital Image Correlation for Measuring Residual Stress by Incremental Hole Drilling

2008 ◽  
Vol 13-14 ◽  
pp. 65-73 ◽  
Author(s):  
Jerry D. Lord ◽  
David Penn ◽  
P. Whitehead
Keyword(s):  
Residual Stress ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Gauge ◽  
Biaxial Stress ◽  
Image Correlation ◽  
Hole Drilling ◽  
Validation Data ◽  
Strain Fields ◽  
Incremental Hole Drilling

The measurement of residual stress using the incremental hole drilling is well established, but the main limitations with the conventional strain gauge approach are the requirements for surface preparation, the need for accurate alignment and drilling, the restricted range of hole geometries commensurate with the specific gauge designs, and the limited range of strain data averaged over the footprint of the strain gauge grid. Recent attempts to extend the method have seen the application of full field optical techniques such as electronic speckle pattern interferometry and holographic interferometry for measuring the strain fields around the hole, but these methods are sensitive to vibration and this limits their practical use to controlled laboratory environments. There are significant potential benefits therefore of using a more robust technique based on Digital Image Correlation (DIC), and work is presented in this study on the development of the method for measuring surface displacements and strain fields generated during incremental hole drilling. Some of the practical issues associated with the technique development, including the optimization of applied patterns, the development of the optical system and integration with current hole drilling equipment are discussed, and although measurements are only presented for a single load case - the equi-biaxial stress state introduced during shot peening - the novel aspect of this work is the integration of DIC measurements with incremental drilling and an application of the Integral Method analysis to measure the variation of residual stress with depth. Validation data comparing results from conventional strain gauge data and FE models is also presented.

Determination of Residual Stresses on a Centrifugal Compressor Impeller

2011 ◽  
Author(s):  
Hector Delgado ◽  
Jeff Moore ◽  
Augusto Garcia Hernandez
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Centrifugal Compressor ◽  
Welding Process ◽  
Hole Drilling ◽  
Residual Tensile Stress ◽  
Scanning Method ◽  
Stress Measurements ◽  
Hole Drilling Method ◽  
Compressor Impeller

This paper reports a comparison of two methods to perform residual stress measurements. The specimens tested by each method were two blades from a shrouded centrifugal compressor impeller. The first method is the conventional hole drilling strain gage method which was used to predict residual stresses across the blade surface. The residual stresses are released by drilling a hole in the blade. The second method is called the nonlinear harmonic (NLH) scanning method and is based on the principal that the magnetic domains of ferrous materials vary in a non-linear way relative to internal stress. The effects of residual stress may be either helpful or harmful, depending on the magnitude of the residual with respect to the operating stresses. If not adequately relieved by heat treatment, residual tensile stress that develops in the welding process of shrouded impellers, will add to the stress developed by rotation which moves the point to the right on the Goodman diagram and reduces allowable alternating stress. The results showed comparable residual stress measurements of the NLH method compared to the conventional hole drilling method.

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