scholarly journals Uncertainty quantification of residual stress evaluation by the FIB–DIC ring-core method due to elastic anisotropy effects

2016 ◽  
Vol 87 ◽  
pp. 61-69 ◽  
Author(s):  
Enrico Salvati ◽  
Tan Sui ◽  
Alexander M. Korsunsky
Keyword(s):  
Residual Stress ◽  
Uncertainty Quantification ◽  
Elastic Anisotropy ◽  
Stress Evaluation ◽  
Core Method ◽  
Ring Core

Program Tools for Residual Stress Evaluation by Ring-Core Method

2015 ◽  
Vol 816 ◽  
pp. 389-394
Author(s):  
František Menda ◽  
Patrik Šarga ◽  
Tomáš Lipták ◽  
František Trebuňa
Keyword(s):  
Residual Stress ◽  
Visual Basic ◽  
Individual Case ◽  
Stress Determination ◽  
Element Analysis ◽  
Stress Evaluation ◽  
Core Method ◽  
User Access ◽  
Compliance Matrices ◽  
Ring Core

Residual stress determination requirements of production and research users grow rapidly. Commercially available programs enable relatively quick residual stress evaluation with certain level of accuracy and with limited user access to used compliance matrices and calculations. However precise analyses require sensitive approach to compliance matrices determined for individual case e.g. for specific specimen dimensions. Therefore program tools for complex residual stress evaluation by Ring-Core method were developed using finite element analysis and Visual Basic scripts.

Determination of the Necessary Geometric Parameters of the Specimen in Ring-Core Method

2013 ◽  
Vol 486 ◽  
pp. 90-95 ◽  
Author(s):  
František Menda ◽  
František Trebuňa ◽  
Patrik Šarga
Keyword(s):  
Residual Stress ◽  
Influential Factors ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Incremental Method ◽  
Core Method ◽  
Measuring Techniques ◽  
Drilling Method ◽  
Non Destructive ◽  
Ring Core

There are several measuring techniques for determining residual stress which can be divided according to the created damage in to the construction in non-destructive, semi-destructive and destructive ones. One of the most common is semi-destructive hole-drilling method. This paper deals about Ring-Core method which is based on the similar principles. Today, there is no standard for the Ring-Core method, thus it is important to consider various influential factors. One of them are the dimensions of specimen. Calibration coefficients are determined by finite element (FE) analysis using the commercial software Solidworks. These coefficients are used for residual stress evaluation by incremental method used in Ring-Core method. The influence of different specimen dimensions on the accuracy of the evaluated residual stresses is considered.

Verification of the Geometric Parameters of the Ring-Core Method

2016 ◽  
Vol 827 ◽  
pp. 109-112
Author(s):  
Patrik Šarga ◽  
František Menda ◽  
František Trebuňa
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Complex Analysis ◽  
Geometric Parameters ◽  
Stress Determination ◽  
Residual Stress Determination ◽  
Material Thickness ◽  
Core Method ◽  
Stress Components ◽  
Ring Core

The Ring-Core method is a semi-destructive method for residual stress determination inside materials. The evaluation of residual stresses using Ring-Core method requires complex analysis of the geometric parameters. This work deals with the uniformly distributed residual stress components through the material thickness.

Residual stress of veneered porcelain by ion beam ring-core method

2014 ◽  
Vol 30 ◽  
pp. e22-e23
Author(s):  
F. Massimi ◽  
M. Sebastiani ◽  
I. Tredici ◽  
T. Lucco Castello ◽  
P. Menghini ◽  
...  
Keyword(s):  
Residual Stress ◽  
Ion Beam ◽  
Core Method ◽  
Ring Core

scholarly journals DESIGN OF CONTROL FOR THE DEVICE USING FOR THE DETERMINATION OF RESIDUAL STRESSES BY RING-CORE METHOD

2018 ◽  
pp. 162-168
Author(s):  
Šarga Patrik ◽  
Trebuňa František ◽  
Grejták Branislav
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Strain Gauge ◽  
Programmable Logic Controller ◽  
Experimental Methods ◽  
Programmable Logic ◽  
Measuring Device ◽  
Core Method ◽  
Ring Core ◽  
Original Device

Urgency of the research. Residual stresses in machine parts and constructions greatly affect their service life and reliability. They are introduced into the manufactured object at each production process and their level can change significantly due to the operation of the product. Their main risk lies in the fact that they add up to the external load and can be the cause of the failure of the construction. Residual stresses can not be determined by simulation methods. They can only be determined using experimental methods. One of these method is the Ring-Core method, the principle of which is to form an annular groove around the strain gauge. Creating of annular groove releases the internal stresses, which can be recorded by a strain gauge. The quality of the formed groove has a significant impact on the overall results of residual stress determination, so it is important to make it as accurate as possible. For this reason, it is necessary to have the most reliable device to form an annular groove. Target setting. Our goal was to design the drive and control for the measuring device for milling the annular groove. This will make it possible to mill the annular groove more precisely, and the resulting residual stresses will be minimally affected by the inaccuracy of the groove. Actual scientific researches and issues analysis. When designing the control of the device and preparing this paper, we took into account not only current sources – publications and papers dealing with the current state of existing measuring devices used for determining residual stresses by Ring-Core method, but – we also took into account our practical experience gained in numerous residual stress determinations by experimental methods. Uninvestigated parts of general matters defining. A modified device requires thorough testing, which has not been implemented during the research for this paper. The research objective. The goal of the research was to create a control for the existing mechanical measuring device used for creating annular groove for determining residual stresses by Ring-Core method. The statement of basic materials. The original mechanical device was supplemented by actuators, which were designed to automate the movement in horizontal axes as well as in the vertical axis. Thanks to this, we have achieved greater precision when positioning the work tool above the center of the strain gauge. At the same time, the original equipment was completed with a servo motor that serves to drive the cutter. For all these elements, control by Programmable Logic Controller was proposed. Conclusions. Our task was to design control for the original device used for residual stress measurement by the RingCore method. We needed to design drives to automate the device. For our needs, we decided to apply linear actuators selected according to the requested criteria. After designing of the electric drives and modifying of the original device, we proceeded to implement control by Programmable Logic Controller. After that, we created a control program in the Automation studio software. This modified measuring device is able to achieve a much higher precision of the annular groove milling, which makes it possible to deter-mine the residual stresses in the structures more precisely

scholarly journals Comparative Residual Stress Evaluation in SLM 3D-printed Al-Si-Mg alloy (RS-300) Using the Contour Method, Hole Drilling Laser Speckle Interferometry, X-ray Diffraction and Xe pFIB-DIC Micro-ring-core Milling

2021 ◽  
Author(s):  
Eugene S. Statnik ◽  
Fatih Uzun ◽  
Svetlana A. Lipovskikh ◽  
Sviatoslav I. Eleonsky ◽  
Vladimir S. Pisarev ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Speckle Interferometry ◽  
Laser Speckle ◽  
Contour Method ◽  
Hole Drilling ◽  
X Ray Diffraction ◽  
Stress Evaluation ◽  
3D Printed ◽  
Ring Core

SLM Additive Manufacturing has demonstrated great potential for aerospace applications when structural elements of individual design and/or complex shape need to be promptly supplied. 3D-printable AlSi10Mg (RS-300) alloy is widely used for the fabrication of different structures in aerospace industry. The importance of the evaluation of residual stresses that arise as a result of complex 3D-printing process thermal history is widely discussed in literature, but systematic assessment remains lacking for their magnitude, spatial distribution, and comparative analysis of different evaluation techniques. In this study we report the results of a systematic study of residual stresses in a 3D-printed double tower shaped samples using several approaches: the contour method, blind hole drilling laser speckle interferometry, X-ray diffraction, and Xe pFIB-DIC micro-ring-core milling analysis. We show that a high level of tensile and compressive residual stresses is inherited from SLM 3D-printing and retained for longer than 6 months. The stresses vary over a significant proportion of the material yield stress. All residual stress evaluation techniques considered returned comparable values of residual stresses even regardless of dramatically different dimensional scales from millimeters for the Contour Method down, laser speckle interferometry and XRD and down to small fractions of a mm (70 μm) for Xe pFIB-DIC ring-core drilling. The use of residual stress evaluation is discussed in the context of optimizing the printing strategy to enhance the mechanical performance and long-term durability.

scholarly journals Comparative Multi-Modal, Multi-Scale Residual Stress Evaluation in SLM 3D-Printed Al-Si-Mg Alloy (RS-300) Parts

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2064
Author(s):  
Eugene S. Statnik ◽  
Fatih Uzun ◽  
Svetlana A. Lipovskikh ◽  
Yuliya V. Kan ◽  
Sviatoslav I. Eleonsky ◽  
...  
Keyword(s):  
Residual Stress ◽  
3D Printing ◽  
Residual Stresses ◽  
Speckle Interferometry ◽  
Laser Speckle ◽  
Contour Method ◽  
Stress Evaluation ◽  
3D Printed ◽  
Evaluation Techniques ◽  
Ring Core

SLM additive manufacturing has demonstrated great potential for aerospace applications when structural elements of individual design and/or complex shape need to be promptly supplied. 3D-printable AlSi10Mg (RS-300) alloy is widely used for the fabrication of different structures in the aerospace industry. The importance of the evaluation of residual stresses that arise as a result of the 3D-printing process’ complex thermal history is widely discussed in literature, but systematic assessment remains lacking for their magnitude, spatial distribution, and comparative analysis of different evaluation techniques. In this study, we report the results of a systematic study of residual stresses in 3D-printed double tower shaped samples using several approaches: the contour method, blind hole drilling laser speckle interferometry, X-ray diffraction, and Xe pFIB-DIC micro-ring-core milling analysis. We show that a high level of tensile and compressive residual stresses is inherited from SLM 3D-printing and retained for longer than 6 months. The stresses vary (from −80 to +180 MPa) over a significant proportion of the material yield stress (from −⅓ to ¾). All residual stress evaluation techniques considered returned comparable values of residual stresses, regardless of dramatically different dimensional scales, which ranged from millimeters for the contour method, laser speckle interferometry, and XRD down to small fractions of a mm (70 μm) for Xe pFIB-DIC ring-core drilling. The use of residual stress evaluation is discussed in the context of optimizing printing strategies to enhance mechanical performance and long-term durability.

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