Mechanical properties are substantiated, that are the most vulnerable to maintenance material deterioration of under prolonged operating time, accompanied by intense damage. The opposite behavior of relative elongation and contraction indicates the intensity of scattered damage of the operated metal. Reducing the percentage reduction indicates operational metal embrittlement, as a result of strain hardening, which can serve as confirmation of the increase in hardness and microhardness. Fractographic analysis of failure mechanisms of steel 17G1S cut in the length and breadth of the pipe is implemented.

This paper proposes a multi-objective Green Vehicle Routing Problem (G-VRP) considering two types of vehicles likely company-owned vehicle and third-party logistics in the imprecise environment. Focusing only on one objective, especially the distance in the VRP is not always right in the sustainability point of view. Here we present a bi-objective model for the G-VRP that can address the issue of the emission of GreenHouse Gases (GHGs). We also consider the demand as a rough variable. This paper uses the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) to solve the proposed model. Finally, it uses Multicriteria Optimization and Compromise Solution (abbreviation in Serbian – VIKOR) method to determine the best alternative from the Pareto front.

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Santrauka. Straipsnyje nagrinėjama automobilių keliamo triukšmo žala eismo dalyviams ir aplinkiniams, taip pat apžvelgiami Lietuvoje ir Europos Sąjungoje galiojantys dokumentai, reglamentuojantys triukšmo prevenciją ir ateityje įgyvendinamas triukšmo mažinimo priemones. Eksperimentinėje dalyje pateikiama aikštelėje stovinčių automobilių variklių keliamo triukšmo matavimo metodika ir miesto teritorijoje transporto srauto sukelto triukšmo eksperimentiniai tyrimai. Remiantis gautais rezultatais pateikiamos išvados.

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