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Ultimate compressive strength assessment of uncleaned and cleaned corroded plates with locked crack

Woloszyk Krzysztof, Garbatov Yordan

Polish Maritime Research

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2021

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nr 3

117--127

EN

The work presented here investigates the structural response of cleaned corroded plates, subjected to compressive load in the presence of a locked crack, where the change of mechanical properties as a result of corrosion development and the cleaning process is also accounted for. A Finite Element model for assessing the compressive strength, considering geometric and material nonlinearities, is developed, and the analysed plates are compared with the available experimental data. An experimental design plan is generated using the Design of Experiments techniques, which quantifies the influence of the governing variables and their interactions with respect to the plate’s ultimate compressive strength. With a limited number of observations, the most significant effects are identified. The corrosion degradation is revealed to be the most crucial effect leading to an effective strength reduction. It was found that, in the case of a corroded plate with a locked crack subjected to a compressive load, the most severe case is when the crack is transversely oriented. The strength reduction is slightly lower than when the corrosion degradation and the presence of a crack are considered to be a simple summation of these two effects but acting separately. The outcome of the analysis is the development of several empirical formulations that allow a fast estimation of the ultimate strength of a corroded plate, subjected to compressive load in the presence of a locked crack, accounting for different cleaning.

2

Analysis of ultimate compressive strength of cracked plates with the use of doe techniques

Woloszyk Krzysztof, Garbatov Yordan

Polish Maritime Research

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2020

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nr 3

109--120

EN

The objective of this work is to investigate the structural compressive response of plates with locked cracks accounting for all relevant factors and correlation between them. The nonlinear FE model considering both geometric and material nonlinearities is employed herein, and the FE model of the structural response of intact plates is validated with the available experimental data. In the common studies, based on One Factor at a Time analysis, some of the parameters and interactions between them are excluded. In the present study, the numerical investigations are conducted with the use of the Design of Experiments techniques, where all essential parameters and their interactions are adequately considered. With a total of 32 numerical analyses, the most influential factors and their interactions are identified. As a study outcome, empirical formulations, which allow for a fast estimation of the ultimate compressive strength of intact plates, plates with locked cracks, and repaired cracked plates, are derived. The developed formulations represent a fast and practical tool for estimating the ultimate compressive strength of intact, cracked, and repaired plates, which can be easily employed in the reliability analysis.results followed by their discussion.

3

Designing Cement Mortars Modified with Cork and Rubber Waste Using Theory of the Experiment

Dębska Bernardeta, Krasoń Joanna, Lichołai Lech

Journal of Ecological Engineering

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2019

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Vol. 20, nr 9

121--130

EN

The article concerns the possibility of obtaining modified cement mortars and assessing their selected properties, i.e. bending and compressive strength, volume density of hardened mortars and water absorption. The modification consisted in a partial (0–50% vol.) substitution of sand by waste, crushed rubber, and cork. In the mortar design process, the theory of the experiment was used. The central composite design used available in the Statistica software package was response surface. This approach allowed to significantly reduce the number of experiments, reduce costs, and at the same time keep the maximum information about the mortars tested. The conducted research showed that waste materials can be an alternative to natural aggregates in the process of obtaining light mortars.

4

Zastosowanie planowania eksperymentów (DoE) do oceny elastyczności metody na przykładzie oznaczania cyklosporyny A w tkanakach oka królików techniką UHPLC DAD

Szerkus O., Siluk D., Kaliszan R., Markuszewski M. J.

Analityka : nauka i praktyka

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2017

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nr 1

4--11

PL

Badanie elastyczności metody z zastosowaniem podejścia DoE zostało pomyślnie przeprowadzone i przedstawione na przykładzie oznaczania CsA w tkankach oka królików.