Analytical expressions of the influence functions for accuracy and versatility improvement in the hole-drilling method

2000 ◽  
Vol 35 (2) ◽  
pp. 125-135 ◽  
Author(s):  
M Beghini ◽  
L Bertini
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stress Distribution ◽  
Hole Drilling ◽  
Geometrical Parameters ◽  
Influence Functions ◽  
Hole Drilling Method ◽  
General Series ◽  
Drilling Method ◽  
Analytical Expressions

Analytical expressions of the influence functions suitable for obtaining variable through-thickness residual stresses by the hole-drilling method are proposed. They were determined by interpolating the results of accurate finite element simulations of the experimental arrangement as prescribed by the ASTM standard. The effects of the geometrical parameters and material properties were included. The influence functions allow the relaxed strain measured by the strain gauge rosette to be directly calculated for a general residual stress distribution. With no interpolation of tabular values, they can be employed to evaluate the coefficients required for the application of the integral method. It is also shown how the influence functions can be used to obtain residual stress distribution on the basis of a fully general series expansion.

Modeling and Measurement of Residual Stresses along the Process Chain of Autofrettaged Components by Using FEA and Hole-Drilling Method with ESPI

2013 ◽  
Vol 768-769 ◽  
pp. 79-86 ◽  
Author(s):  
Horst Brünnet ◽  
Dirk Bähre ◽  
Theo J. Rickert ◽  
Dominik Dapprich
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Speckle Pattern ◽  
Residual Stress Distribution ◽  
Electronic Speckle Pattern Interferometry ◽  
Hole Drilling ◽  
Element Analysis ◽  
Hole Drilling Method ◽  
Drilling Method

The incremental hole-drilling method is a well-known mechanical measurement procedure for the analysis of residual stresses. The newly developed PRISM® technology by Stresstech Group measures stress relaxation optically using electronic speckle pattern interferometry (ESPI). In case of autofrettaged components, the large amount of compressive residual stresses and the radius of the pressurized bores can be challenging for the measurement system. This research discusses the applicability of the measurement principle for autofrettaged cylinders made of steel AISI 4140. The residual stresses are measured after AF and after subsequent boring and reaming. The experimental residual stress depth profiles are compared to numerically acquired results from a finite element analysis (FEA) with the software code ABAQUS. Sample preparation will be considered as the parts have to be sectioned in half in order to access the measurement position. Following this, the influence of the boring and reaming operation on the final residual stress distribution as well as the accuracy of the presented measurement setup will be discussed. Finally, the usability of the FEA method in early design stages is discussed in order to predict the final residual stress distribution after AF and a following post-machining operation.

Analysis on Residual Stresses of the Casing Part in Aeroengine Based on Hole-Drilling Method

2013 ◽  
Vol 770 ◽  
pp. 159-163
Author(s):  
Dian Ye Cao ◽  
Yin Fei Yang ◽  
Zhi Wu Liu ◽  
Jie Yu ◽  
Liang Li
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Annealing Treatment ◽  
Residual Stress Distribution ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Measurement Results ◽  
Drilling Method ◽  
Before And After

In order to study the residual stress distribution of the casing part in aeroengine, the hole-drilling method was used to measure the residual stress before and after the annealing treatment. The measurement results indicated that the annealing treatment significantly improved the residual stress distribution in the part, and the residual stresses were showed as compressive stress. Meanwhile, the measured residual stress distribution would provide the basis for controlling the machining distortion of the casing part in aeroengine.

scholarly journals Measuring residual stress in finite thickness plates using the hole-drilling method

2019 ◽  
Vol 54 (1) ◽  
pp. 65-75 ◽  
Author(s):  
Marco Beghini ◽  
Leonardo Bertini ◽  
Anoj Giri ◽  
Ciro Santus ◽  
Emilio Valentini
Keyword(s):  
Residual Stress ◽  
Finite Thickness ◽  
Residual Stress Distribution ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Experimental Application ◽  
Metal Sheets ◽  
Drilling Method ◽  
Mathematical Relationships ◽  
Calibration Coefficients

Hole-drilling is one of the most popular methods for measuring residual stress in mechanical components. The ASTM E837 standard defines the hole-drilling method for plates that are either thicker or thinner than the size of the hole diameter and provides the related calibration coefficients for these two conditions. Measurements for components with a thickness in the range of a few millimetres, such as typical metal sheets, are not considered. In this article, the effects of thickness on the hole-drilling measurements are examined by a finite element parametric analysis. A method is proposed to analyse the measurements in plates with an intermediate thickness. The procedure is suitable for determining a general in-depth non-uniform residual stress distribution. Mathematical relationships are proposed which enable calibration coefficients to be obtained for any thickness. An experimental application confirms the validity of the procedure.

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