Optimization of depth increment distribution in the ring-core method

1996 ◽  
Vol 31 (4) ◽  
pp. 251-258 ◽  
Author(s):  
B Zuccarello
Keyword(s):  
Core Method ◽  
Ring Core ◽  
Depth Increment

scholarly journals Estimation of Residual Stress Field Uniformity when Using the Ring-Core Method

2014 ◽  
Vol 996 ◽  
pp. 325-330 ◽  
Author(s):  
František Menda ◽  
Patrik Šarga ◽  
František Trebuňa
Keyword(s):  
Complex Analysis ◽  
Hole Drilling ◽  
Data Sets ◽  
Residual Stress Field ◽  
Hole Drilling Method ◽  
Core Method ◽  
Uniformity Test ◽  
Drilling Method ◽  
Field Uniformity ◽  
Ring Core

The evaluation of residual stresses using Ring-Core method requires complex analysis of the acquired strain values. The development is based on ASTM Standard E837-08 for hole-drilling method, but the specific approach for Ring-Core is needed. The input data sets obtained from strain gage rosette are categorized by proposed uniformity test. The influence of geometric parameters of the specimen on this test and subsequently on the both uniform and nonuniform calculations is considered.

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.

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.

Effect of the Kinematic Hardening in the Simulations of the Straightening of Long Rolled Profiles

2014 ◽  
Vol 611-612 ◽  
pp. 178-185 ◽  
Author(s):  
Chantal Bouffioux ◽  
Romain Boman ◽  
Nicolas Caillet ◽  
Nicolas Rich ◽  
Jean Philippe Ponthot ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Inverse Method ◽  
Kinematic Hardening ◽  
Material Behavior ◽  
The Finite Element Method ◽  
The Real ◽  
Core Method ◽  
Hot Rolled ◽  
The Impact ◽  
Ring Core

Residual stresses and lack of straightness appear during the cooling of sheet piles where the initial temperature field is not homogeneous. To meet the standards, the long hot rolled pieces are straightened using a series of rollers placed alternately above and below the pieces with shifts which create a succession of bendings. The process is modeled to study the impact of the industrial parameters (the duration of the cooling and the rollers positions), to improve the final geometry and to reduce the residual stresses. Tests are carried out on this structural steel to observe the material behavior, then material laws are chosen and the parameters of these laws are defined using an inverse method. Two sets of material data are obtained: for the first one, the hardening is supposed to be isotropic, and for the second one, additional tests are performed to describe isotropic and kinematic hardenings. The cooling followed by the straightening is then simulated by the finite element method with these two sets of data. The comparison of the rollers forces, the deformation and the residual stresses show the impact of the kinematic hardening on such a process where the material undergoes a succession of tensions and compressions. The real forces applied by the rollers, the real curvature of the interlocks at the end of the straightening process and the distribution of the residual longitudinal stresses measured on the web using the ring core method are used to validate the numerical model.

scholarly journals Comparison of Different Simulation Approaches in Ring-Core Method

2014 ◽  
Vol 2 (7) ◽  
pp. 258-261 ◽  
Author(s):  
František Menda ◽  
Patrik Šarga ◽  
Tomáš Lipták ◽  
František Trebuňa
Keyword(s):  
Core Method ◽  
Ring Core
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