Estimation of the residual strength of supporting composite structural elements

Kayumov, R. A.; Strakhov, Dmitry; Sulejmanov, Alfred; Tuysina, E B

doi:10.1088/1757-899x/934/1/012042

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…The second way is to replace the random loading process with a schematized process, which, in terms of the level of introduced fatigue damage, should be equivalent to the real one. In this case, it is possible to reduce the test time due to the use of an appropriate equivalent mode [9][10].…”

Section: Introductionmentioning

confidence: 99%

Calculation of the durability of sealing and awning materials

2021

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The article discusses the hypotheses for determining the equivalent laboratory modes for assessing the durability of sealing and awning materials, and evaluates the accuracy of the proposed method. Qualitative research of operational factors influence (UV, temperature) on sealing and awning materials durability was conducted. Purpose of the study: a method for predicting the durability of sealing and awning materials. Methods: Methods for fast assessment of durability and methods of equivalent factors. Results: Based on the obtained regularities of the behavior of sealing and awning materials under conditions of repeated loading and ultraviolet radiation, as well as the accepted hypotheses about the summation of damage and irreversibility of the destruction process, a laboratory test mode was determined that was equivalent in terms of the level of introduced destruction to the operating mode, including the action of multiple loads and ultraviolet radiation. Based on the equivalent accelerated test mode and the characteristics of the operating mode of loading and irradiation, a method for assessing the durability of sealing and awning materials is proposed.

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Section: Introductionmentioning

confidence: 99%

Calculation of the durability of sealing and awning materials

2021

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Method censored samples consideration in composite fatigue testing

Gadolina

Serebrjakova

Smelov³

2021

J. Phys.: Conf. Ser.

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Summary Taking into consideration the huge scatter of fatigue performance of composite, as well as the experimentally proved absence of unconditional fatigue limit, the method for statistical improvement was developed which allows to improve the statistical quality of fatigue curve. Some preliminary considerations about mechanical testing tool in quality control are shown. The source of data scatter in fatigue testing is discussed. For building of the method, the statistical approach from the group of intensive use of computer, namely, bootstrap was employed. The model example on the base of real testing was investigated. Applying the method will help to include the information of censored samples into the result of testing.

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A method of accounting for censored items as part of fatigue testing of composite materials

Gadolina¹,

Maidanov²,

Smelov³

et al. 2021

Nadežnostʹ

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The Aim of the paper is to create a method for including information on censorship for the purpose of adjusting the estimates of the S-N diagram of composite materials. Censored items are such items that did not fail by the end of testing, for which a certain operation time has been registered. It must be noted that, currently, researchers often ignore the operation time data of the items that did not fail by the end of testing, which does not appear to be justified in terms of cost saving and reliability of statistical conclusions. Censorship information is very important in terms of assessing durability. It only needs the right tool to use it. The proposed Method consists in bootstrapping-based simulation, a method from the group of computer-intensive methods. In the process of the method’s development, the previously used approaches (for instance, as regards metals) were considered. In the examined example of the method’s application, the data was taken from literary sources. Results. The paper shows an example of fatigue testing conducted by the authors that produced a large number of censored items. The results obtained using the method were compared with real data. It is shown that the quality of statistical estimation improves with the use of the method. The paper sets forth certain observations regarding the mechanical testing tool for quality control. The source of data dispersion associated with fatigue testing is discussed. Conclusions. The application of the method will help include the information on censored items in the estimation of the S-N diagram. For scientists who are involved in the experimental research of the fatigue resistance of composite materials, the suggested method might prove to be quite useful. It takes into consideration the characteristic features of the strength analysis of composite materials (large properties dispersion and absence of unlimited fatigue range). The method will allow taking onto account an important, but not always so far used information on the items that operated a certain number of cycles, but did not fail.

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Estimation of the residual strength of supporting composite structural elements

Cited by 3 publications

References 6 publications

Calculation of the durability of sealing and awning materials

Calculation of the durability of sealing and awning materials

Method censored samples consideration in composite fatigue testing

A method of accounting for censored items as part of fatigue testing of composite materials

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