scholarly journals Residual stress profile determination by the hole-drilling method with calibration coefficients obtained using FEM

2021 ◽  
pp. 661-673
Author(s):  
Fábio Corrêa ◽  
Frederico Jahnert ◽  
Jucélio Tomás
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Stress Profile ◽  
Residual Stress Profile ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
Calibration Coefficients

Residual Stress Analysis in Crankshaft Using the Hole Drilling Method

2006 ◽  
Vol 524-525 ◽  
pp. 537-542
Author(s):  
Guillaume Montay ◽  
Abel Cherouat ◽  
Jian Lu
Keyword(s):  
Residual Stress ◽  
Finite Elements ◽  
Complex Shape ◽  
Hole Drilling ◽  
Stress Profile ◽  
Residual Stress Profile ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
Residual Stress Analysis ◽  
Calibration Coefficients

The aim of this paper is to determine the incremental residual stress profile in depth of a complex shape. The authors have adapted the hole drilling method in a crankshaft and more precisely in the filet area. A new set of calibration coefficients have been determined using the finite elements method in order to analyse residual stresses in the structure.

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.

Dependence Between Aging Treatments and Residual Stresses on Composite Laminate

2006 ◽  
Vol 524-525 ◽  
pp. 813-817 ◽  
Author(s):  
Olivier Sicot ◽  
X.L. Gong ◽  
Xiao Jing Gong ◽  
Abel Cherouat ◽  
Jian Lu
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Composite Structures ◽  
Hole Drilling ◽  
The Finite Element Method ◽  
Hole Drilling Method ◽  
Incremental Hole Drilling ◽  
Drilling Method ◽  
Initial Cycle ◽  
Calibration Coefficients

The objective of this paper is to study the influence of residual stresses due to fabrication conditions on the thermomechanical behavior of carbon/epoxy laminate structures (cross ply). These studied laminates have undergone various cycles of thermal aging. The addition of a post-cure cycle after the end of the initial cycle makes it possible to reduce the residual stresses level. The incremental hole-drilling method is used to measure the residual strain in the laminates. These measured strains and the numerical calibration coefficients obtained by the finite element method allow to calculating the residual stress distribution in composite depth. The obtained results show that heat treatments of composite structures do not lead to an important reduction the initial residual stress due the fabrication conditions.

scholarly journals Residual Stresses from Incremental Hole Drilling Using Directly Deposited Thin Film Strain Gauges

2022 ◽  
Author(s):  
S. Heikebrügge ◽  
R. Ottermann ◽  
B. Breidenstein ◽  
M.C. Wurz ◽  
F. Dencker
Keyword(s):  
Thin Film ◽  
Residual Stress ◽  
Strain Gauges ◽  
Hole Drilling ◽  
Depth Profiles ◽  
Hole Drilling Method ◽  
Polymer Foil ◽  
Incremental Hole Drilling ◽  
Drilling Method ◽  
Calibration Coefficients

Abstract Background Commonly, polymer foil-based strain gauges are used for the incremental hole drilling method to obtain residual stress depth profiles. These polymer foil-based strain gauges are prone to errors due to application by glue. For example zero depth setting is thus often erroneous due to necessary removal of polymer foil and glue. This is resulting in wrong use of the calibration coefficients and depth resolution and thus leading to wrong calculations of the obtained residual stress depth profiles. Additionally common polymer foil-based sensors are limited in their application regarding e.g. exposure to high temperatures. Objective This paper aims at a first step into the qualification of directly deposited thin film strain gauges for use with the incremental hole drilling method. With the directly deposited sensors, uncertainties regarding the determination of calibration coefficients and zero depth setting due to the absence of glue can be reduced to a minimum. Additionally, new areas of interest such as the investigation of thermally sprayed metallic layers can be addressed by the sensors due to their higher temperature resilience and their component inherent minimal thickness. Methods For the first time, different layouts of directly deposited thin film strain gauges for residual stress measurements were manufactured on a stainless steel specimen. Strain measurements during incremental hole drilling using a bespoke hole drilling device were conducted. Residual stress depth profiles were calculated using the Integral method of the ASTM E837 standard. Afterwards, strain measurements with conventional polymer foil-based strain gauges during incremental hole drilling were conducted and residual stress depth profiles were calculated accordingly. Finally the obtained profiles were compared regarding characteristic values. Results The residual stress depth profiles obtained from directly deposited strain gauges generally match the ones obtained from conventional polymer foil based strain gauges. With the novel strain gauges, zero depth setting is simplified due to the absence of glue and polymer foil. With the direct deposition, a wide variety of rosette designs is possible, enabling a more detailed evaluation of the strain field around the drilled hole. Conclusions The comparative analysis of the obtained residual stress depth profiles shows the general feasibility of directly deposited strain gauges for residual stress measurements. Detailed investigations on uncertainty sources are still necessary.

Residual Stress Measurements in an Autofrettage Tube Using Hole Drilling Method

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Hamid Jahed ◽  
Mohammad Reza Faritus ◽  
Zeinab Jahed
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Hoop Stress ◽  
Test Method ◽  
Test Material ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Ring Sample ◽  
Drilling Method ◽  
American Society

Relieved strains due to drilling hole in a ring sample cut from an autofrettage cylinder are measured. Measured strains are then transformed to residual stresses using calibration constants and mathematical relations of elasticity based on ASTM standard recommendations (American Society for Testing and Materials, ASTM E 837-08, 2008, “Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method,” American Society for Testing and Materials). The hydraulic autofrettage is pressurizing a closed-end long cylinder beyond its elastic limits and subsequently removing the pressure. In contrast to three-dimensional stress state in the autofrettage tube, the stress measurement in hole drilling method is performed on a traction free surface formed from cutting the ring sample. The process of cutting the ring sample from a long autofrettaged tube is simulated using finite element method (FEM) and the redistribution of the residual stress due to the cut is discussed. Hence, transformation of the hole drilling measurements on the ring slice to the autofrettage residual stresses is revealed. The residual stresses are also predicted by variable material properties (VMP) method (Jahed, H., and Dubey, R. N., 1997, “An Axisymmetric Method of Elastic-Plastic Analysis Capable of Predicting Residual Stress Field,” Trans. ASME J. Pressure Vessel Technol., 119, pp. 264–273) using real loading and unloading behavior of the test material. Prediction results for residual hoop stress agree very well with the measurements. However, radial stress predictions are less than measured values particularly in the middle of the ring. To remove the discrepancy in radial residual stresses, the measured residual hoop stress that shows a self-balanced distribution was taken as the basis for calculating residual radial stresses using field equations of elasticity. The obtained residual stresses were improved a lot and were in good agreement with the VMP solution.

scholarly journals Incremental Hole-Drilling Method Vs. Thin Components: A Simple Correction Approach

2014 ◽  
Vol 996 ◽  
pp. 283-288 ◽  
Author(s):  
Esther Held ◽  
Simone Schuster ◽  
Jens Gibmeier
Keyword(s):  
Residual Stress ◽  
Thin Metal ◽  
Hole Drilling ◽  
Depth Profiles ◽  
Hole Drilling Method ◽  
Incremental Hole Drilling ◽  
Metal Sheets ◽  
Drilling Method ◽  
Measured Strain ◽  
The Impact

The incremental hole-drilling method is a widely used technique to determine residual stress depth profiles in technical components. Its application is limited in respect to the components geometry, for instance the components thickness. In this paper, a direct correction of the measured strain relaxations is proposed to consider the impact of deviant geometries, here the component thickness, on the residual stress evaluation that moreover, allows the application of commercially available evaluation software. The herein proposed approach is based on finite element simulation of the incremental hole drilling. The simulated strain relaxations for thin metal sheets are evaluated with an algorithm as used in commercially available evaluation software (i) for uncorrected data as well as (ii) for strain data corrected by the proposed correction procedure. It is shown that the correction approach leads to a significant improvement of the measurement accuracy. Further, by means of the approach residual stress depth profiles in thin metal sheets can be as usual determined using commercial evaluation software for the incremental hole-drilling method regardless of the algorithm used, i.e. differential or integral.

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