Steps to increase practical applicability of PragTic software

Tomčala, Jiří; Papuga, Jan; Horák, David; Hapla, Vaclav; Pecha, Marek; Čermák, Martin

doi:10.1016/j.advengsoft.2018.06.009

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…The values in the brackets are constant and do not change with every loading cycle. Generally, we can obtain the fatigue strength values from different sources, e.g., Boller and Seeger [ 21 ] material table data or websites which publish experimental fatigue test results, such as the Fatlim selector explained by Tomcala et al [ 27 ]. In the case of R = 0, the model is simplified into the form:

…”

Section: Methodsmentioning

confidence: 99%

Application of the S-N Curve Mean Stress Correction Model in Terms of Fatigue Life Estimation for Random Torsional Loading for Selected Aluminum Alloys

et al. 2020

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The paper presents the experimental fatigue test results for cyclic constant amplitude loading conditions for the case of the torsion of the PA4 (AW-6082-T6), PA6 (AW-2017A-T4) and PA7 (AW-2024-T3) aluminum alloy for a drilled diabolo type test specimen. The tests have been performed for the stress asymmetry ratios R = −1, R = −0.7, R = −0.5 and R = −0.3. The experimental results have been used in the process of a fatigue life estimation performed for a random generated narrowband stress signal with a zero and a non-zero global mean stress value. The calculations have been performed within the time domain with the use of the rainflow cycle counting method and the Palmgren−Miner damage hypothesis. The mean stress compensation has been performed with the S-N curve mean stress model proposed by Niesłony and Böhm. The model has been modified in terms of torsional loading conditions. In order to obtain an appropriate R = 0 ratio S-N curve fatigue strength amplitude, the Smith−Watson−Topper model was used and compared with literature fatigue strength amplitudes. The presented solution extends the use of the correction model in terms of the torsional loading condition in order to obtain new S-N curves for other R values on the basis of the R = −1 results. The work includes the computational results for new fatigue curves with and without the mean stress effect correction. The results of the computations show that the mean stress effect plays a major role in the fatigue life assessment of the tested aluminum alloys and that the method can be used to assess the fatigue life under random conditions.

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…”

Section: Methodsmentioning

confidence: 99%

Application of the S-N Curve Mean Stress Correction Model in Terms of Fatigue Life Estimation for Random Torsional Loading for Selected Aluminum Alloys

et al. 2020

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“…The IA can seem to be more computationally demanding due to the potential requirement of a small integration step to reduce the computational integration error. Tomc ˇala et al 40 have recently shown that the stability of results of the IA is better in comparison with critical plane solutions when the number of evaluated planes is intentionally decreased to quicken the calculation. An interesting variant of this approach was recently introduced by Albinmousa and Al Hussain, 41 who analyze the damage on all planes perpendicular to the surface and integrate those partial damages over whole range of plane rotation angles 0-2π.…”

Section: Multiaxial Stress Parametersmentioning

confidence: 99%

“…The IA can seem to be more computationally demanding due to the potential requirement of a small integration step to reduce the computational integration error. Tomčala et al 40 have recently shown that the stability of results of the IA is better in comparison with critical plane solutions when the number of evaluated planes is intentionally decreased to quicken the calculation.…”

Section: Concurring Effectsmentioning

confidence: 99%

Various parameters of the multiaxial variable amplitude loading and their effect on fatigue life and fatigue life computation

Papuga

Margetin

Chmelko

2021

Fatigue Fract Eng Mat Struct

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The paper discusses various partial solutions used for estimating fatigue life under variable amplitude multiaxial loading in the high‐cycle fatigue domain. The concurring effects are treated, and their proposed solutions are commented upon. The major focus is on the categories of the phase shift effect and of cycle counting and on the scope and quality of data, which support discussed theories. Results of own new experimental data set on specimens from S355 steel are provided. Fatigue life estimates for McDiarmid and Findley multiaxial methods and for two different methods of load path decomposition to cycles are shown to highlight some of the points open for discussion. It is concluded that the available experimental data are not sufficient to substantiate a clear decision to follow a definite algorithm.

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“…The reason for this could be the computational cost -the integration scheme could be more demanding on analyzing the space than the widely-used maximization procedure that is relevant for critical plane schemes. Tomčala et al prove in their sensitivity study [44] that if the same computational error induced by discrete evaluation plane-by-plane is admitted for the critical plane and for integral concepts, the number of planes to be evaluated is approximately two times lower for the integral solution. Kenmeugne et al [45] proposed that the optimum application of the integral concept can be assumed to be for cases of frequent principal directions rotations, which are intrinsic e.g.…”

Section: Integral Criteriamentioning

confidence: 99%

Differences in the response to in-phase and out-of-phase multiaxial high-cycle fatigue loading

Papuga

Nesládek

Jurenka

2019

Frattura Ed Integrità Strutturale

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This paper discusses the phase shift effect occurring between two and more load channels of multiaxially loaded specimens. The discussion concludes that there is an extreme shortage of good experimental data that would prove the existence and the trend of the phase shift effect in the highcycle fatigue region. It is no wonder that there are so many fatigue strength estimation criteria that use quite different computational concepts, because the response to the phase shift effect in the experimental base is often hidden in a conglomeration of other interacting effects. The paper presents results of a sensitivity study that compares the fatigue strength estimation results for various such criteria for the same stress amplitudes, but for different phase shifts between the push-pull and torsion load channels. These results show that, with the exception of criteria that assume a zero phase shift effect, the phase shift affects the results of each studied fatigue strength estimation criterion in a different way. A proposal for an experimental setup that would show the real trend unambiguously, and that would enable researchers to check the multiaxial fatigue strength criteria is provided in the paper.

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Steps to increase practical applicability of PragTic software

Cited by 5 publications

References 16 publications

Application of the S-N Curve Mean Stress Correction Model in Terms of Fatigue Life Estimation for Random Torsional Loading for Selected Aluminum Alloys

Application of the S-N Curve Mean Stress Correction Model in Terms of Fatigue Life Estimation for Random Torsional Loading for Selected Aluminum Alloys

Various parameters of the multiaxial variable amplitude loading and their effect on fatigue life and fatigue life computation

Differences in the response to in-phase and out-of-phase multiaxial high-cycle fatigue loading

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