Methodology and Software Package for Assessment of Stress-strain State Parameters of Full-Scale Structures and Its Application to a Study of Loading Level, Defect Rate, and Residual Stress Level in Elements of NPP Equipment

Chernyatin, A. S.; Разумовский, И. А.

doi:10.1007/s11223-013-9486-6

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…To implement all these steps, a software system based on a joint work environments Ansys and Matlab is designed …”

Section: Statement Of the Problemmentioning

confidence: 99%

“…The idea of minimization is well known, but the proposed method offers original features of mathematical, experimental, numerical and programming realization. The method can be applicable for simultaneous determination of different parameters of geometry, loading, material and so on in other inverse problems of solid mechanics . The data of e i are calculated by means of the finite element method (FEM), which allows carrying out a solution of the direct problem in the most general statement.…”

Section: Introductionmentioning

confidence: 99%

“…The method can be applicable for simultaneous determination of different parameters of geometry, loading, material and so on in other inverse problems of solid mechanics. 11,12 The data of e i are calculated by means of the finite element method (FEM), which allows carrying out a solution of the direct problem in the most general statement. The array of experimental data e i * is expected to be obtained using modern experimental methods of recording displacements or strains fields such as digital speckle pattern interferometry (DSPI) and digital image correlation or photoelastic method.…”

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confidence: 99%

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A computational tool for estimating stress fields along a surface crack front

Chernyatin

Matvienko

Razumovsky

2014

Fatigue Fract Eng Mat Struct

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A combined experimental and computational method for determination of the singular and non‐singular stress terms along the front of the 3D surface crack is proposed. It is suggested to evaluate the terms by means of comprehensive comparison between deformation responses on the structure surface in the vicinity of the crack obtained experimentally and from numerical solutions of the corresponding boundary problem of solid mechanics. As the deformation response, a local displacement field caused by the formation of a small hole at the tip of the crack recorded by digital speckle pattern interferometry may be considered. The proposed approach allows defining such real parameters of the structure as the active load conditions in the crack region and crack sizes. These parameters are used to solve the direct problem and to determine the stress intensity factor KI and Txx‐, Tzz‐stresses along the surface crack front by means of an improved technique of their calculation. The approach accuracy and stability at different conditions have been proved by means of numerical simulation that examined half‐space with planar semi‐elliptical surface crack under biaxial loading. So, the potential applicability of the proposed method is demonstrated. The biaxiality effect on KI and Txx, Tzz is discussed.

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“…To implement all these steps, a software system based on a joint work environments Ansys and Matlab is designed …”

Section: Statement Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A computational tool for estimating stress fields along a surface crack front

Chernyatin

Matvienko

Razumovsky

2014

Fatigue Fract Eng Mat Struct

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“…The methodology leans upon the approach proposed in [13][14][15], which is based on finding the state parameters P j (j = 1, …, N P ) from the condition of the minimum discrepancy of the experimentally obtained (in this case, as a result of indentation) data set (i = 1, …, N e ) and the corresponding dataset e i , which are found based on the numerical solution of the corresponding boundary value problem of deformed solid body mechanics (j is the state parameter number which may reflect, for example, the stress distribution on the area or the size of the defect; i is the deformation response number which corresponds to a certain point of measurement and a displacement vector component; N e is the total number of responses). The measure of data discrepancy is the objective function .…”

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confidence: 99%

The indentation method as a method of assessment of loading and degradation of mechanical characteristics of the material

Chernyatin

Разумовский

2015

J. Mach. Manuf. Reliab.

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On the basis of the calculation of a series of model problems on pressing a hard spherical indenter into a half space from a reinforcing material we show the possibility of using the indentation for the simultaneous determination of effective stresses, as well as the yield strength of the material. The methodology leans upon an approach based on finding unknown parameters from the condition of minimization of discrepancies in the data of registration experimental registration of displacement fields by electronic speckle pattern interferometry, which result from indentation, and their corre sponding calculated displacement fields found on the basis of a numerical solution of a series of boundary value problems of deformed solid body mechanics.

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