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Examination of remaining zinc coating on old corrugated steel culverts under railway

Hansing L., Cederqvist S.

Archiwum Instytutu Inżynierii Lądowej

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2017

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Nr 23

125--131

EN

In this paper the authors present measurements of the zinc coating thickness performed on old corrugated steel culverts under railway in Sweden. The measurements were performed in the summer of 2015. The object of the study is to have an indication on how hot dip galvanized corrugated steel culverts withstand real conditions. This information forms an important basis for the decision on possible life time expectancies for those structures.

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Optimization methodology of a product of white line by computational analysis using statistical approach and finite elements

Sousa C. J., Marcondes P. V. P., Lajarin S. F.

Archives of Materials Science and Engineering

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2016

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Vol. 81, nr 1

30--36

EN

Purpose: The industry constantly seek reduction of production costs combined with improved product quality. The major challenge faced is to maintain the product quality. In this work, it is proposed an optimization methodology for a product of the white line. The objective is to study the behavior of some components after a reduction in sheet thickness and maintain the same original structural loads. Design/methodology/approach: A two-dimensional mathematical model, obtained in CAD software, for numerical simulation of the effects of the reduction in thickness, is examined. Finally, it was developed an optimized methodology, based on mathematical and statistical analysis, in order to calculate the possible sheet thickness reduction from its original structure. Findings: It was observed that it is possible by means of computer simulation and appropriate statistical analysis to decrease the thickness of assembled components in order to optimize costs and processes. Research limitations/implications: Since this is an experimental research with numerical data, it would be fundamental for this technique of optimization a future research with physical products for comparison with the computational data. Originality/value: The objective of experiment is maintain the product quality and because it is a job for optimization of processes and consequently costs, the great beneficiary will be the industry.

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Reconstruction of the pre-compactional thickness of the Zechstein Main Dolomite in northwest Poland

Semyrka G., Gancarz M., Mikołajewski Z.

Geologos

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2015

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Vol. 21, No. 4

303--314

EN

Our reconstruction of the pre-compactional thickness of the Main Dolomite strata from the so-called Grotów Peninsula (northwest Poland) was based on macroscopic observations of drill cores from three wells: Mokrzec-1, Sieraków-4 and Międzychód-5. These wells are located in various palaeogeographical zones of the Main Dolomite and cored rocks represent a range of microfacies. The amount of compactional reduction in thickness of the Main Dolomite was estimated by summing the total heights (Wst) of all stylolites encountered in logs of these wells. For calculations, a generalised model of a drill core was developed, which embraced all types of stylolite seams present in the Main Dolomite succession studied. Also the method of stylolite dimensioning was demonstrated. The number of stylolites in the drill cores studied varied from 511 in the Sieraków-4 well to 1,534 in the Międzychód-5 well. In all cores studied low-amplitude macrostylolites predominated, but the reduction of thickness was controlled mostly by the low- and medium-amplitude macrostylolites. The largest number of stylolites was found in the grainstone/packstone microfacies. The turnout of stylolites depends of microfacies. The highest density of stylolites was documented in mudstones/wackestones (24 stylolites per metre of rock thickness) and the lowest in boundstones (14 stylolites per metre of rock thickness). The low-amplitude stylolites appear most frequently in the mudstone/wackestone microfacies (15 stylolites per metre of rock thickness); in grainstones/packstones, rudstones/floatstones and boundstones middle-amplitude stylolites are rare (3 stylolites per metre of rock thickness). The degree of compaction of the Main Dolomite succession studied varied from 6 to 10%; hence, its calculated initial thickness also varied in the wells studied: from 41.3 m in the Sieraków-4 well to 56.9 m in the Mokrzec-1 well and to 97.1 m in the Międzychód-5 well. The volumes of reservoir fluids expelled during compaction of 1 m3 of Main Dolomite carbonates were estimated as 56 l in the Sieraków-4 well, 90 l in the Mokrzec-1 well and 97 l in the Międzychód-5 well.